Browsing by Author "U.K. Ghosh"

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Diffusion Coefficient in Aqueous Polymer Solutions
(1991) U.K. Ghosh; S. Kumar; S.N. Upadhyay
The diffusion coefficients for benzoic add in a number of aqueous solutions of poly(vinyl alcohol) (3.0 and 6.0% polymer by weight) and poly (ethylene oxide) (0.75-3.5% polymer by weight) are reported. The diffusivity values are obtained by measuring the rate of mass transfer of benzoic acid from the surfaces of rotating disks. Data on solubility of benzoic acid in poly(ethylene oxide) are also reported. The diffusivities in the polymer solutions are found to be Independent of shear rate and are lower than those in water. © 1991, American Chemical Society. All rights reserved.
Heat and Mass Transfer from Immersed Bodies to Non-Newtonian Fluids
(Academic Press, 1994) U.K. Ghosh; S.N. Upadhyay; R.P. Chhabra
[No abstract available]
Mass transfer from spherical and nonspherical particles to non-newtonian fluids
(1992) U.K. Ghosh; S. Kumar; S.N. Upadhyay
Mass transfer coefficients are measured for aqueous solutions of carboxy methyl cellulose (CMC) flowing past single immersed spherical and nonspherical particles of benzoic acid. The test particles used are 1.265-3.05 cm diameter spheres and 0.5388-1.1431 cm diameter cylindrical pellets, and the fluids used are demineralized water and 1 % and 3% aqueous CMC solutions. The results obtained are analyzed and discussed using Acrivos and effective viscosity approaches, and empirical correlations for predicting heat and mass transfer coefficient are also proposed. © 1992 by Marcel Dekker, Inc.