Convective diffusion from a non-uniformly distributed source in flowing blood

Mashelkar, R. A.; Venkatsubramanian, C. V.

doi:10.1007/bf00705607

Cited by 2 publications

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“…Mashelkar and Venkatsubramanian (1975) have already elaborated the utility of such a flow technique for diffusivity measurement in blood at low RBC concentrations, where the settling problem is acute. The potential of this method is thus worth exploring further not only with respect to mass diffusivity measurements but also the thermal diffusivity measurements, since the theoretical development in the foregoing is equally applicable to the corresponding heat transfer problem.…”

Section: Discussionmentioning

confidence: 99%

“…For Newtonian as well as non-Newtonian liquids analytical solutions to the pulse disturbance were offered by Gill (1975,1976) and by Booras and Krantz (1976). Mashelkar and Venkatsubramanian (1975) obtained a numerical solution for a Casson fluid with special attention on the problem of urea diffusivity determination in flowing blood. However, these authors did not report any experimental data for such systems.…”

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confidence: 99%

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Convective Diffusion From a Non-Uniformly Distributed Source in Non-Newtonian Fluids: A Theoretical Investigation and Experimental Confirmation

Venkatsubramanian

Mashelkar

Ulbrecht

1978

Chemical Engineering Communications

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This work presents a complete theoretical study of the process of convective diffusion from a non-uniformly distributed source in a non-Newtonian fluid flowing through a straight tube. The influence of the governing parameters on the dispersion process is studied and the results areexamined in terms of the interaction of rheology, fluid mechanics anddiffusion. Experimental studies have been conducted to obtain the diffusivity values of NaOH in aqueous polymer solutions and provide the first test of the potential of this technique for diffusivity measurement in difficult systems.Measurement of molecular diffusion coefficients of solutes in non-Newtonian media is crucially important from the point of view of being able to understand the pragmatically important convective diffusion processes, which occur in these media. The state-ofthe-art in this area was recently reviewed by Astarita and Mashelkar (1977). This review clearly emphasizes the need for more experimental data on molecular diffusivities in non-Newtonian media but more importantly, it showed that reliable flow techniques are essential for the diffusivity determination in highly viscous non-Newtonian media since in the conventional static techniques a very long time is required to attain an appreciable concentration gradient. In the present work, we analyse theoretically the possibility of using the technique of convective diffusion from a non-uniformly distributed source and set up experiments to simulate the model conditions. We then provide experimental results to show how such a technique can be used for diffusivity measurements.BACKGROUND

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%