Diffusion coefficient in aqueous polymer solutions

Ghosh, Ujjal; Kumar, Sujit; Upadhyay, Sanjay

doi:10.1021/je00004a020

Cited by 13 publications

(3 citation statements)

References 21 publications

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“…In all cases, diffusion coefficients increase with increasing temperature, as expected. Ghosh et al [7] Sahay et al [9] Dunker [6] Steele and Geankoplis [11] Wilke and Chang [18] Seidell [10] c* (kg/m 3 ) = 1. [12][13][14][15][16][17] at different temperatures, and this is an indication of the accuracy of the proposed method.…”

Section: Resultsmentioning

confidence: 99%

Molecular Diffusion Coefficients of Organic Compounds in Water at Different Temperatures

Delgado

2007

J Phs Eqil and Diff

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Molecular (or tracer) diffusion coefficient data were obtained for 2-naphthol, benzoic acid, salicylic acid, camphor, and cinnamic acid in water at temperatures that differ significantly from ambient value. Experimental values were determined for the dissolution of 2-naphthol in water at 283 to 368 K, of benzoic acid in water at 283 to 338 K, of salicylic acid in water at 283 to 343 K, of camphor in water at 283 to 318 K, and of cinnamic acid in water at 283 to 318 K. Empirical correlations are presented for the prediction of molecular diffusion coefficient over the entire range of temperatures studied, and they are shown to predict the obtained data with very good accuracy.

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Section: Resultsmentioning

confidence: 99%

Molecular Diffusion Coefficients of Organic Compounds in Water at Different Temperatures

Delgado

2007

J Phs Eqil and Diff

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“…3 For conversion of 4 e (t) to C e (t) the below equation was used C e (t) ¼ 4 e (t)r s (10) where, r s is density of solvent vapor.…”

Section: Governing Equationsmentioning

confidence: 99%

“…The process will continue with an arrangement of polymer chains in a special structure which is affected by solvent diffusion mechanism. [8][9][10] On the other hand, during the mass transfer, diffusion of solvent affects polymer concentration as well as mobility of polymer molecules. The latter case is controlled by glass transition temperature of the mixture, that is T g,mix .…”

Section: Introductionmentioning

confidence: 99%

Determination of concentration-dependent diffusion coefficient of seven solvents in polystyrene systems using FTIR-ATR technique: experimental and mathematical studies

et al. 2016

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Mass transfer between flowing fluid and sphere buried in packed bed of inerts

2004

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The equations describing fluid flow and mass transfer around a sphere buried in a packed bed are presented, with due consideration given to the processes of transverse and longitudinal dispersion. Numerical solution of the equations was undertaken to obtain point values of the Sherwood number as a function of the Peclet and Schmidt numbers over a wide range of values of the relevant parameters. A correlation is proposed that describes accurately the dependence found numerically between the values of the Sherwood number and the values of Peclet and Schmidt numbers. Experiments on the dissolution of solid spheres (benzoic acid and 2-naphthol) buried in packed beds of sand, through which water was forced, at temperatures in the range 293 K to 373 K, gave values of the Sherwood number that were used to test the theoretical results obtained. Excellent agreement was found between theory and experiment, including the large number of available data for naphthalene-air, and this helps establish the proposed correlation as"general" for mass transfer between a buried sphere and the fluid (liquid or gas) flowing around it.

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Diffusion coefficient in aqueous polymer solutions

Cited by 13 publications

References 21 publications

Molecular Diffusion Coefficients of Organic Compounds in Water at Different Temperatures

Molecular Diffusion Coefficients of Organic Compounds in Water at Different Temperatures

Determination of concentration-dependent diffusion coefficient of seven solvents in polystyrene systems using FTIR-ATR technique: experimental and mathematical studies

Mass transfer between flowing fluid and sphere buried in packed bed of inerts

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