Browsing by Author "Santosh Kumar Gupta"

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Influence of phase change material properties on heat storage and discharge characteristics of latent heat thermal battery for solar thermal applications
(Springer Science and Business Media B.V., 2025) G. Raam Dheep; Yogesh Kumar Verma; Santosh Kumar Gupta; Satyabrata Jit
The present work focuses on analyzing the thermal reliability and corrosion properties of shell and tube heat exchanger system. In this work, Polyethylene Glycol 4000 is used as phase change material (PCM). PEG 4000 is subjected to accelerated thermal cycling tests to study the thermal reliability and corrosion properties of the PCM. The thermal reliability study of PEG 4000 shows that the change in melting temperature and latent heat of fusion after 1000 thermal cycles is − 1.66% and − 1.92%. Thermal performances such as charging and discharging properties of latent heat storage system incorporated with PEG 4000 PCM are also analyzed in the present work for different mass flow rates of a heat transfer fluid (HTF). Further, a shell and tube heat exchanger based latent heat storage system is developed to investigate the heat storage characteristics of PEG 4000. The temperature of HTF is maintained at 80 °C and 25 °C during charging and discharging of thermal energy. The thermal charging duration for different mass flow rates of HTF at 3, 4, and 5 kg min−1 were 45, 65, and 85 min, respectively. Similarly, during discharge the mass flow rate of HTF is maintained at 2 and 3 kg min−1. The thermal discharging duration for the corresponding mass flow rate is 20 and 15 min, respectively. The analysis reveals that the PEG 4000 is stable in terms of chemical, thermal, less corrosive and has good heat transfer characteristics. © Akadémiai Kiadó Zrt 2025.
Phylogenetic analysis of Indian isolates of Pasteurella multocida based on partial 16S rRNA gene sequences: Association of caprine isolate with lineage B
(Indian Council of Agricultural Research, 2018) Madhu Mishra; T.G. Sumithra; Santosh Kumar; Santosh Kumar Gupta; Rajesh Kumar Agarwal; Viswas Konasagara Nagaleekar
Pasteurella multocida is responsible for diseases, which are endemic and economically important in India, still comparative investigations on phylogenetic relations of Indian P. multocida isolates are scarce. Therefore, present study was undertaken to understand the phylogenetic relationship of several isolates belonging to different host, place of isolation and capsular types based on partial 16S rRNA gene sequencing. In the current study, a 838 bp fragment of 16S rRNA gene of 35 field isolates of P. multocida belonging to different capsular types, recovered from cattle, buffalo, sheep, goat, pigs and birds, collected from different states of India sequenced and analyzed. There were 12 unique 16S rRNA types among 35 isolates, which clustered into 2 distinct phylogenetic lineages, viz. A and B. There were strong correlations between the phylogenetic relations and capsular types, with maximum heterogeneity seen among isolates of capsular type A. However, there was no clustering based on the host or place of isolation indicating the potential hazard of interspecies sharing and the possibility of translocation of infected animals across international borders. Moreover, one of the caprine isolates belonged to lineage B. To the best of our knowledge, this is the first report of a caprine isolate in lineage B, since lineage B is reported to be exclusively associated with birds and cats. It may be alarming that the strains of lineage B are becoming adapted to different host species. © 2018 Indian Council of Agricultural Research. All rights reserved.