Browsing by Author "Yadav D."
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Item Analytical and numerical examinations on the stability investigation of Casson nanofluid flow in a permeable layer controlled by vertical throughflow(Emerald Publishing, 2024) Mohamad A.M.; Yadav D.; Awasthi M.K.; Ragoju R.; Bhattacharyya K.; Mahajan A.Purpose: The purpose of the study is to analytically as well as numerically investigate the weight of throughflow on the onset of Casson nanofluid layer in a permeable matrix. This study examines both the marginal and over stable kind of convective movement in the system. Design/methodology/approach: A double-phase model is used for Casson nanofluid, which integrates the impacts of thermophoresis and Brownian wave, whereas for flow in the porous matrix the altered Darcy model is occupied under the statement that nanoparticle flux is disappear on the boundaries. The resultant eigenvalue problem is resolved analytically as well as numerically with the help of Galerkin process with the Casson nanofluid Rayleigh�Darcy number as the eigenvalue. Findings: The findings revealed that the throughflow factor postpones the arrival of convective flow and reduces the extent of convective cells, whereas the Casson factor, the Casson nanoparticle Rayleigh�Darcy number and the reformed diffusivity ratio promote convective motion and also decrease the extent of convective cells. Originality/value: Controlling the convective movement in heat transfer systems that generate high heat flux is a real mechanical challenge. The proposed framework proved that the use of throughflow is one of the most important ways to control the convective movement in Casson nanofluid. To the best of the authors� knowledge, no inspection has been established in the literature that studies the outcome of throughflow on the Casson nanofluid convective flow in a porous medium layer. However, the convective flow of Casson nanofluid finds many applications in improving heat transmission and energy efficiency in a range of thermal systems, such as the cooling of heat-generating elements in electronic devices, heat exchangers, pharmaceutical practices and hybrid-powered engines, where throughflow can play a significant role in controlling the convective motion. � 2024, Emerald Publishing Limited.Item Artificial light harvesting gel based on saponification-triggered gelation of aggregation-induced emissive BODIHYs(Royal Society of Chemistry, 2024) Yadav D.; Singh V.D.; Kushwaha A.K.; Kumar A.; Singh R.S.The present work provides a detailed study on saponification-triggered gelation of ester-based BODIHYs (B1 and B2) derived from ethyl 4-(2-(benzo[d]thiazol-2-yl(cyano)methylene)-hydrazinyl)-benzoate (L1) and diethyl 5-(2-(benzo[d]thiazol-2-yl(cyano)methylene)hydrazinyl)-isophthalate (L2). The ligands and BODIHYs display good emission in the solution and solid states. This study describes the gelation of BODIHYs for the first time, wherein stable gels GL2 and GB2 were prepared via saponification-triggered gelation of L2 and B2, respectively. The gelation and optical properties of the ligands and BODIHYs were compared through single-crystal X-ray diffraction studies. This work further explores the prospect of artificial light harvesting (ALH) via fabrication of ALHSs in the solution {B1/rhodamine B (RhB) and B2/RhB} and gel states (GB2/RhB). It was observed that in the presence of RhB, the emission intensities of BODIHYs and the gel decreased but those of RhB increased. The significant overlapping between the absorption spectrum of RhB and emission spectra of aggregates/gel suggests the possibility of energy transfer via noncovalent interactions. In these systems, B1, B2 and GB2 served as donors, whereas RhB served as an acceptor. � 2024 The Royal Society of Chemistry.Item Bioactive Glass for Biomedical Application: An Overview(Springer Science and Business Media Deutschland GmbH, 2024) Yadav S.; Yadav D.; Kumar P.; Yadav A.; Nirala G.; Yadav S.The term �bioceramics� describes the ceramics utilized in the reconstruction and restoration of damaged or diseased musculoskeletal system parts. Based on their biological response, bioceramics can be divided into three categories: basically bioinert materials (like zirconia and alumina), bioactive materials (like HA and bioactive glasses), and biodegradable materials (like TCP). Bioactive ceramics, including calcium phosphates, glass�ceramics, and bioactive glasses, can encourage the formation of hydroxyapatite deposits that resemble bone at their surface and offer an interface that contributes to the functional durability of the tissue. An amorphous material with an arbitrary atom configuration is called bioactive glass. The majority of bioactive glasses are mostly composed of SiO2, Na2O, CaO, and P2O5. Fast bonding to bone occurred when the bioactive glass�s silica content was between 42 and 53%. For the production of silicate-, phosphate-, and borate-based bioactive glasses, several compositional modifications are made to the bioactive glasses. They have been employed, among other things, in dental root replacements, middle ear replacements, and bone scaffolds. Bioactive glasses have the ability to form a chemical link with living bone tissue, which is further enhanced by biological responses on the material�s surface. Due of its low mechanical qualities, bioglass cannot be used for large load-bearing applications. These are employed in situations where mechanical strength is not required and regeneration is essential. � The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.Item Building Resilient Urban Futures: Adapting Cities to Climate Change Challenges(Springer, 2024) Jaiswal A.; Sagar R.; Pandey A.; Yadav D.; Ansari M.S.; Rawat R.As urbanization continues to accelerate worldwide, cities face increasing challenges posed by climate change. Urban areas, as hubs of economic, social, and environmental activity, are particularly vulnerable to the impacts of climate change, including extreme weather events, rising temperatures, and sea-level rise. In response, the concept of urban resilience has emerged as a critical framework for understanding and addressing these challenges. This abstract explores the nexus of urban resilience and climate change, focusing on the strategies, challenges, and opportunities for building resilience in cities. It examines the various dimensions of urban resilience, including infrastructure, governance, social dynamics, and economic systems, and highlights the importance of integrating climate adaptation and mitigation efforts into urban planning and development processes. Key strategies for enhancing urban resilience include investments in green infrastructure, adoption of nature-based solutions, promotion of sustainable urban design and land-use planning, and strengthening of social cohesion and community engagement. However, numerous challenges hinder the implementation of these strategies, such as limited financial resources, institutional barriers, political constraints, and social inequalities. Nevertheless, amidst these challenges lie opportunities for innovation and transformation. Cities have the potential to leverage emerging technologies, harness data-driven approaches, and foster collaboration across sectors and stakeholders to enhance their resilience to climate change. Furthermore, by adopting a holistic and inclusive approach to urban resilience, cities can not only mitigate the impacts of climate change but also create more equitable, sustainable, and livable urban environments for all residents. � The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.Item Effect of crosslinker on the electrochemical properties of starch-based water-in-polymer-salt electrolytes(Springer Science and Business Media Deutschland GmbH, 2024) Yadav D.; Pandey A.; Srivastava N.Water-In-Polymer-Salt-Electrolytes (WiPSEs) are identified as the highly conductive electrolytes (~0.01 S/cm) with wide electrochemical stability window (ESW) for the advanced energy storage devices. In our previous reports, we reported that cross-linked starches are good hosts for Polymer-In-Salt-Electrolytes (PISEs) synthesis and by exposure to high humidity atmosphere, it behaves like WiPSE. In the present study, our effort is to understand the effect of change in bonding structure on the mechanical and electrochemical properties of these materials. Hence, in the present case we have varied both, the salt concentration and the crosslinker amount, because crosslinker amount is supposed to enrich the covalent bonding and hence water absorption through hydrogen bonding will be negatively affected. Effect of crosslinking variations of GA (1- to 5-ml Glutaraldehyde for 1-g starch) is studied at three varied salt concentrations (50, 66, 75 wt % salt). Highest conductivity is found to be ~0.03 S/cm with ESW of ~2 V with flexible morphology. Further, a supercapacitor is fabricated by using 75 wt % salt WiSPE with coated carbon cloth-based electrodes. Specific capacitance is of order of 10 F/g at 10 mV/s scan rate with coulombic efficiency greater than ~85%. This work confirms the theoretical understanding that loosely bound structures are better for PISEs/WiPSEs. Being economical and environment-friendly, these electrolytes have the potential to reach commercial level if explored in detail. � The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.Item Effect of High Humidity Exposure to Wheat Starch Based High Conducting Flexible Polymer-in-Salt-Electrolyte(John Wiley and Sons Inc, 2024) Yadav D.; Basuroy S.; Kumar R.; Aggarwal K.; Srivastava N.Polymer-in-salt-electrolytes (PISEs) are an important class of electrolytes as they carry the promise of faster and single ion transport. Unfortunately, due to unavailability of a suitable polymer host PISE has still not reached to commercial level. In the present work, using a novel synthesis protocol developed by the group, glutaraldehyde crosslinked wheat starch has been successfully modified with sodium iodide (NaI) to synthesize a flexible PISE membrane with desired electrochemical properties. Present paper reports the effect of crosslinker and exposure to high humidity ambience on electrochemical and morphological properties. It has been established that on exposure to higher humidity atmosphere starch-based PISEs stabilize at lower resistance value, but with higher ion relaxation time, which indicates that effect of high humidity treatment is more on salt dissociation instead of assisting the ion transport. The studied materials have conductivity ?0.01 S�cm?1 range with ESW >2.5�V, ensuring its usability in electrochemical devices. The developed synthesis protocol does not require any complicated synthesis route and/or sophisticated instrument hence the overall process is economical also, adding up to its potentiality for energy device fabrication. � 2024 Wiley-VCH GmbH.Item Genome-wide identification of nuclear factor -Y (NF�Y) transcription factor family in finger millet reveals structural and functional diversity(Elsevier Ltd, 2024) Rani V.; Singh V.K.; Joshi D.C.; Singh R.; Yadav D.The Nuclear Factor Y (NF�Y) is one of the widely explored transcription factors (TFs) family for its potential role in regulating molecular mechanisms related to stress response and developmental processes. Finger millet (Eleusine coracana (L.) Gaertn) is a hardy and stress-tolerant crop where partial efforts have been made to characterize a few transcription factors. However, the NF�Y TF is still poorly explored and not well documented. The present study aims to identify and characterize NF�Y genes of finger millet using a bioinformatics approach. Genome mining revealed 57 EcNF-Y (Eleusine coracana Nuclear Factor-Y) genes in finger millet, comprising 18 NF-YA, 23 NF-YB, and 16 NF-YC genes. The gene organization, conserved motif, cis-regulatory elements, miRNA target sites, and three-dimensional structures of these NF-Ys were analyzed. The nucleotide substitution rate and gene duplication analysis showed the presence of 7 EcNF-YA, 10 EcNF-YB, and 8 EcNF-YC paralogous genes and revealed the possibilities of synonymous substitution and stabilizing selection during evolution. The role of NF-Ys of finger millet in abiotic stress tolerance was evident by the presence of relevant cis-elements such as ABRE (abscisic acid-responsive elements), DRE (dehydration-responsive element), MYB (myeloblastosis) or MYC (myelocytomatosis). Twenty-three isoforms of miR169, mainly targeting a single NF�Y gene, i.e., the EcNF-YA13 gene, were observed. This interaction could be targeted for finger millet improvement against Magnaporthe oryzae (blast fungus). Therefore, by this study, the putative functions related to biotic and abiotic stress tolerance for many of the EcNF-Y genes could be explored in finger millet. � 2024Item Impact of temperature-reliant thermal conductivity and viscosity variations on the convection of Jeffrey fluid in a rotating cellular porous layer(Royal Society Publishing, 2024) Yadav D.; Awasthi M.K.; Ragoju R.; Bhattacharyya K.; Kodi R.; Hassan M.; Wang J.In this analysis, the collective impact of temperature-dependent thermal conductivity and viscosity variations on the convective instability of a Jeffrey fluid in a rotating layer of cellular porous material is examined using an improved Jeffrey�Darcy model. This study has significant implications for cellular foams made from plastics, ceramics and metals, in which radiative heat transmission can be taken as a diffusion practice. Utilizing the linear stability concept and Galerkin method, approximate analytical and numerical solutions accurate to one decimal place are offered. The analysis reveals that the effect of the thermal conductivity variation factor and the rotation factor is to postpone the convective wave, whereas the viscosity variation factor and the Jeffrey factor have a dual effect in the form of rotation. The range of the convective cell is reduced with cumulating thermal conductivity variation factor, viscosity variation factor, Jeffrey factor and rotation factor. In the absence of rotation, the range of the convective cell is not dependent on the Jeffrey factor or the viscosity variation factor. Furthermore, the outcomes are matched with the existing literature for the specific case of this investigation. � 2024 The Author(s). Published by the Royal Society. All rights reserved.Item Influence of La3+ doping on structural and optical properties of SrCeO3 perovskite(Institute of Physics, 2024) Yadav D.; Kumar P.; Tripathi A.K.; Yadav R.S.; Nirala G.; Yadav S.; Yadav A.K.; Yadav S.The SrCe1-xLaxO3 (x = 0.0, 0.02, 0.4, 0.6, and 0.10) perovskite materials have been successfully synthesized by auto-combustion method and calcined at 1100�C. The XRD patterns reveal a highly crystalline orthorhombic crystal structure with a Pnma space group in all samples. The TEM micrograph shows a spherical morphology of the 10 mol% La3+ doped SrCeO3 perovskite sample alongwith the SAED pattern confirming its highly crystalline nature. The incorporation of La3+ ion in the SrCeO3 perovskite has been confirmed by the Raman and Fourier transform infrared (FTIR) measurements. The UV-vis absorption spectra at room temperature show various bands, with a strong absorption band observed below 400 nm. The optical band gap of the undoped and La3+ doped samples have been calculated and it is smaller for the La3+ doped perovskite samples than that of the undoped perovskite sample. Therefore, the La3+ doped SrCeO3 perovskite may be applicable for optoelectronic applications. � 2024 IOP Publishing Ltd. All rights, including for text and data mining, AI training, and similar technologies, are reserved.Item Investigating Ca2+ salt�based polymer-in-salt electrolyte for future energy storage systems(Springer Science and Business Media Deutschland GmbH, 2024) Aggarwal K.; Yadav D.; Tiwari K.; Kushwaha P.; Srivastava N.The scientific community is continuously putting efforts to improve the energy/power density of energy storage devices, which leads to development of novel materials with enhanced electrochemical properties. Polymer-in-salt electrolytes (PISEs) are expected to have faster ion transport and hence may result in improved power density. In the present study, Ca salt�based PISE is synthesized using glutaraldehyde (GA)�crosslinked arrowroot starch as host matrix. The synthesized PISE has high conductivity (~ 0.01 S/cm), wide electrochemical stability window (ESW > 3�V), and small characteristic relaxation time (? ~ 17��s) indicating the possibility of faster response in any device fabricated using synthesized PISEs. Fabricated supercapacitor, using the highest conducting PISE with rGO as electrode, has specific capacitance ~ 17 F/g at 1�mV/s and high power density 2.1�kW/kg with coulombic efficiency (CE) of > 90.05% and with CAC as electrode, specific capacitance ~ 125 F/g at 1�mV/s and high power density 2.1�kW/kg with coulombic efficiency (CE) of > 99%. � The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.Item Linear and nonlinear investigations of the impact of chemical reaction on the thermohaline convection in a permeable layer saturated with Casson fluid(American Institute of Physics Inc., 2024) Yadav D.; Nair S.B.; Awasthi M.K.; Ragoju R.; Bhattacharyya K.In this effort, the consequence of chemical reaction on the thermohaline convection in a permeable layer containing Casson fluid is inspected utilizing both linear and nonlinear stability procedures. To model the momentum equation, the Casson fluid version of Darcy's law is utilized. Applying the linear stability concept, the situation for the start of stationary and oscillatory pattern of convective motion is obtained, whereas the convective heat and mass transferences are determined using nonlinear stability theory. It is found that the oscillatory type of convective flow is probable only if the evaluation of the solutal Rayleigh-Darcy number is less than zero. The effect of the chemical reacting factor, the Casson factor, the Lewis number, and the solutal Rayleigh-Darcy number is to hurry the start of convection toward both stationary and oscillatory styles of convection and also surge the size of the convective cells. The convective heat and mass transfers enhance with increasing the Casson factor, the solutal and thermal Rayleigh-Darcy numbers while both decrease with enhancing the heat capacity quotient. The effect of chemical reacting factor is to increase the mass transmission in the system, while it has no effect on the heat transmission. It is also noted that the convective heat and mass transfers in the system enhance nearly 5.4% and 3.8%, respectively, with a 50% increase in the value of Casson factor. � 2024 Author(s).Item Molecular docking insights into nuclear factor Y (NF-Y) transcription factor and pyrabactin resistance 1 (PYL) receptor proteins reveal abiotic stress regulation in finger millet(Elsevier B.V., 2024) Rani V.; Singh V.K.; Joshi D.C.; Singh R.; Yadav D.Finger Millet (Eleusine coracana - (L.) Gaertn), is an important nutraceutical crop with the potential for imparting food and nutritional security. These plants have a comparatively higher tolerance for several abiotic stresses like drought, salinity, and heat. Several players including Transcription Factor (TF) like Nuclear Factor Y (NF-Y) might be associated with this enhanced level of tolerance. Further, it is unclear how phytohormones like Abscisic acid (ABA) regulate the expression of NF-Y, whether in ABA-dependent or ABA-Independent pathway. The interaction of PYL (Pyrabactin resistance1-like) receptor proteins with Nuclear Factor Y (NF-Y) Transcription Factor in the presence of phytohormones like abscisic acid (ABA) provides one insight related to the enhanced tolerance towards abiotic stresses under ABA-dependent signaling in finger millet crop. A total of three PYL receptors of finger millet designated as EcPYL1, EcPYL5, and EcPYL9 were retrieved in the finger millet genome. These receptors were modeled through the SWISS-MODEL using templates 5gwo and 3wg8 and docked with ABA. The best-docked protein-ligand complex PYL5-ABA (binding energy ?G ?= ?-8.8 kcal mol-1) was found to be most stable at the 50ns MD simulation study. Further protein-protein interaction between PYL5 and NF-YA2/B3/C1 sub-family members showed a good interaction. This clearly indicates the possibility of the NF-Y-PYL module in the ABA transduction pathway, which performs a crucial role in the expression of stress-responsive genes. These studies reveal the intricate relationship between the ABA, PYL receptors of finger millet, and NF-Y transcription factor in regulating the stress-responsive genes and provide an insight into the abiotic stress tolerance mechanisms, which can be targeted for crop improvement. � 2024 The AuthorsItem PIDA-promoted metal-free [3 + 2] heteroannulation of ?-ketothioamides with 4-hydroxy coumarins: chemo-/regioselective access to furo[3,2-c]chromen-4-ones at room temperature(Royal Society of Chemistry, 2024) Kumar Yadav A.; Yadav D.; Kumar V.; Ray S.; Singh M.S.Herein, we report a viable protocol to access furo[3,2-c]chromen-4-ones by engaging easily accessible 4-hydroxy coumarins as a three-atom CCO unit and thioamides as a C2 coupling partner, mediated by phenyliodine(iii) diacetate (PIDA) at room temperature in a highly efficient and pot-/step-economical manner. This strategy not only avoids potential toxicity and tiresome workup conditions, but also features operational simplicity, a broad substrate scope, good functional group tolerance, high yields, easy scalability and exclusive selectivity. A mechanistic study has shown that this metal-free reaction is triggered by PIDA via activation of the ?-carbon of 4-hydroxy coumarin, followed by a nucleophilic addition/intramolecular cyclization/dethiohydration cascade. High-resolution mass spectra (HRMS) study confirms the key intermediates involved during the course of the reaction, elucidating the reaction pathways, and demonstrates the excellent regio- and chemoselectivity of this approach. � 2024 The Royal Society of Chemistry.Item Quantum sub-phase sensitivity of a Mach�Zehnder interferometer with the superposition of Schr�dinger's cat-like state with vacuum state as an input under product detection scheme(Elsevier B.V., 2024) Shukla G.; Yadav D.; Sharma P.; Kumar A.; Mishra D.K.We study the phase sensitivity of a Mach�Zehnder interferometer (MZI) with product detection (PD) scheme by using the superposition of Schr�dinger's cat-like state with the vacuum state (SCVS) and the coherent state as the inputs. We compare the results derived from PD with the parity detection scheme's results. We found that PD performs better than parity detection and approaches the single parameter quantum Cram�r-Rao bound in some cases. Therefore, we expect that SCVS may play as an alternative quantum resource with PD for the improvement in the phase sensitivity of an MZI having potential application in quantum metrology and quantum sensing. � 2023Item Reading history through animal imagery from pre�WWII British editorial cartoons: Gandhi�s anticolonial struggle during India�s civil disobedience movement (1930�1931)(Routledge, 2024) Yadav D.This article studies animal imagery published in pre-WWII British editorial cartoons offering constant updates about India�s Civil Disobedience movement (1930s) against British colonialism to uncover the processes through which the event and the people participating in it, both Indian political leaders and British administrators, were designated a particular animal symbol that popularly became associated with their identities in the long run. In other words, the article looks into the question of how animal images affect the iconography of historical personalities. The article will be an insight into defamiliarizing/deconstructing the events and people from this movement and then analyse how animals were used as substitutes for defining, explaining, and debating a concept, a human, an event, or a nationality in the cartoons published in British newspapers in those times. Consequently, I will explore satirical representations of everyday politics during the Civil Disobedience movement, thus offering the cultural history of the Raj in those times. As these editorial cartoons are published almost at the same time as the actual occurrence of events in the 1930s, they also give an insight into the prevalent colonial stereotypes, traditions, beliefs, humour, tolerance level, as well as �domestic politics, social themes,� of the existing society (Kemnitz). � 2024 Informa UK Limited, trading as Taylor & Francis Group.Item Sensing performance of Au-Ag bimetal coated planar waveguide having polyaniline polymer film for biosensing applications(Walter de Gruyter GmbH, 2024) Yadav D.; Kumar R.; Kumar S.; Sharma G.; Yadav G.C.; Singh V.Bimetal clad planar waveguide having polyaniline polymer as a guiding layer is proposed and studied for biosensing applications. The dispersion relation and reflectivity of the proposed sensor is obtained using transfer matrix method. The sensing performance and stability of proposed waveguide-based sensor is optimized using different volume fraction of Ag-Au bimetal. The volume fraction 1 represents pure Ag metal coating waveguide that shows maximum sensing performance in our all considered cases. In this case, maximum obtain sensitivity, detection accuracy and quality parameter is 74.140, 11.199 and 559.970�/RIU respectively, at the cover refractive index 1.410. Since, resonance angle and full width at half maxima of resonance peak decreases with increase of Ag metal percentage in Ag-Au bimetal therefore the presence of Au metal decreases the sensing performance of the sensor. Hence, a small volume fraction of Au metal is recommended for higher sensitivity with stability. � 2022 Walter de Gruyter GmbH, Berlin/Boston.Item Supercapacitor performance of polymer-in-salt electrolyte/water-in-polymer salt electrolyte synthesized by complexing glutaraldehyde crosslinked corn starch with Mg(ClO4)2(Springer Science and Business Media Deutschland GmbH, 2024) Yadav D.; Pandey K.; Aggarwal K.; Srivastava N.Energy devices with high energy/power density are the need of the day, and to achieve the same, electrolytes with faster ion transport and wider electrochemical�stability window are required. Polymer-in-salt electrolytes (PISEs) are predicted to have the better required electrochemical properties in comparison to salt-in-polymer electrolytes (SIPEs), but desired success is still to be achieved due to recrystallization problems. PISEs suffer from poor mechanical and/or electrochemical properties along with aging effects as well; hence, special efforts are required to reduce the crystallinity of PISEs. The present paper discusses a crosslinked corn starch complexed with Mg(ClO4)2 which not only has desired electrochemical properties but is also flexible. XRD study confirms the absence of crystalline nature, without any extra efforts to reduce it. Synthesized PISEs have high conductivity (~0.01 Scm?1), wide ESW (> 3�V), and low relaxation time (�s) along with being economical. Supercapacitors fabricated using this novel PISE with laboratory synthesized activated carbon (from leaves and corn starch) have shown good specific capacitance (~ 20 Fg?1 and ~ 45 Fg?1, respectively). The power density is of the order of kW kg?1, which is quite high in comparison to other reports. The shape of CV and LSV is strongly influenced by the salt concentration, i.e., by the ion-cluster size, and is also affected by the volume/size of the activated carbon pores. � The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.Item The effect of P�clet number on the onset of Casson fluid convective motion in a porous layer: Analytical and numerical investigations(Taylor and Francis Ltd., 2024) Mohamad A.M.; Yadav D.; Bharatharajan Nair S.; Awasthi M.K.; Ravi R.; Bhattacharyya K.In this article, we present analytical and numerical investigations of the influence of P�clet number on the arrival of Casson fluid convective motion in a horizontal porous layer utilizing the Galerkin technique. The flow in the porous matrix is modeled by an amended Casson-altered Darcy equation that considers the rheological behavior of Casson fluid. The outcomes indicate that the stability of the arrangement drops with growing the Casson parameter, while a reverse result is detected with P�clet number. We demonstrated that the oscillatory instability is not promising for the considered problem. It is also important to note that the extent of the convective cell declines with increasing the P�clet number on using the higher order Galerkin approximation while, on using the single term Galerkin approximation, the P�clet number has no impact on the magnitude of the convection cell. Further, the present results are equated with the available literature under the limiting situation of this study. � 2024 Taylor & Francis Group, LLC.Item The impact of rotation on the onset of cellular convective movement in a casson fluid saturated permeable layer with temperature dependent thermal conductivity and viscosity deviations(Elsevier B.V., 2024) Yadav D.; Awasthi M.K.; Ragoju R.; Bhattacharyya K.; Kodi R.; Wang J.In this effort, we examined the impact of rotation on the arrival of cellular convective motion in a Casson fluid saturated permeable layer with temperature dependent thermal conductivity and viscosity deviations. The problem is important to cellular foams prepared from plastics, ceramics, and metallic where radiation conductivity is revealed as a power function of temperature. The altered Darcy model is used to characterize the rheological performance of Casson fluid flow in permeable medium. The approximate analytical solution and numerical solution correct to one decimal place are presented utilizing the Galerkin method. The analysis reveals that the influence of thermal conductivity disparity parameter and the rotation is to delay the convective motion whereas; the viscosity disparity parameter and the Casson parameter have dual impact on the convective motion in the presence of rotation. The range of the convective cell drops with increasing the thermal conductivity disparity parameter, the viscosity disparity parameter, the Casson parameter and rotation parameter. In the absence of rotation, the range of the convective cell does not depend on the Casson parameter and the viscosity disparity parameter. Further, the existing results are compared with the existing literature under the particular case of this study. � 2024 The Physical Society of the Republic of China (Taiwan)Item The onset of Casson fluid convection in a permeable medium layer produced by purely inner heating with magnetic field(University of Tehran, 2024) Yadav D.; Awasthi M.K.; Mohamad A.M.; Ragoju R.; Bhattacharyya K.; Hassan M.In this inspection, the control of the magnetic power on the onset of Casson fluid convection formed by purely inner warming in a porous medium layer is examined. The modified Darcy model is employed to designate the rheological arrival of Casson liquid flow in a porous matrix. Two types of thermal boundaries are exploited, namely, type (I) both isothermal and type (II) lower insulated and top isothermal boundaries. Using the linear stability inspection and Galerkin technique, the approximate analytical solution and numerical solution correct to one decimal place are offered. It is detected that for type (I) boundary conditions, the convective wave concentrates in the upper layer if it occurs, whereas for type (II) boundary conditions, it emphases in the whole layer. The magnetic Chandrasekhar number postpones the convection movement while the Casson constraint accelerates it. The facet of the convective cells drops with enhancing the magnetic strength and the Casson constraint. In the absenteeism of magnetic field, the Casson constraint has no regulation on the dimension of convective cells. It is also found that the presented analytical result with two term Galerkin process has overall 5% error, while with one term Galerkin process the error was overall 19%. � 2024 University of Tehran. All rights reserved.
