Electrokinetically induced thermofluidic transport of power-law fluids under the influence of superimposed magnetic field

Sarkar, Sandip and Ganguly, Suvankar and Dutta, Pradip (2017) Electrokinetically induced thermofluidic transport of power-law fluids under the influence of superimposed magnetic field. In: CHEMICAL ENGINEERING SCIENCE, 171 . pp. 391-403.

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Abstract

This paper presents a theoretical analysis of non-Newtonian (power-law obeying) fluid in a narrow confinement subjected to the combined consequences of interfacial electrokinetics, rheology, and superimposed magnetic field. We devote special attention on the exploitation of magnetic field and power-law exponent, in the development of induced streaming potential and thermofluidic energy transfer characteristics over small scales. In an effort to do so, going beyond the Debye-litickel limit, we first derive an expression for streaming potential by invoking the consequences of strong EDL (electrical double layer) interactions in the narrow fluidic passage and finite conductance of the Stern layer. In particular, we solve thermal energy transport equation with an illustrative case of classical uniform wall heat flux boundary and considering the volumetric heat generation effects due to viscous dissipation as well as Joule heating. Our results demonstrate that the applied magnetic field imparts a retarding influence on the induced streaming potential development, whereas, it results in enhancement of heat transfer rate. Moreover, additional influences of power law index show reduction in heat transfer as well as the streaming potential magnitude. We unveil the optimal combinations of power law index and the magnetic field which lead to the minimization of the global total entropy generation in the system. We believe that theoretical results presented in this research will be useful in the development of novel narrow fluidic energy efficient devices under electrokinetic modulation. (C) 2017 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	CHEMICAL ENGINEERING SCIENCE
Additional Information:	Copy right for this article belongs to the PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	30 Sep 2017 09:22
Last Modified:	30 Sep 2017 09:22
URI:	http://eprints.iisc.ac.in/id/eprint/57903

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