Irreversibility analysis for ion size-dependent electrothermal transport of micropolar fluid in a microtube

This paper is devoted to studying the thermal characteristics of a completely developed electrokinetic flow of micropolar fluid through a cylindrical microtube when a static electric field is applied to it. Due to the constant heat flux applied, the microtube wall is supposed to get heated continuou...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2023-11, Vol.148 (21), p.12017-12035
Main Authors: Mallick, B., Choudhury, A., Misra, J. C.
Format: Article
Language:English
Subjects:
Analysis
Analytical Chemistry
Chemistry
Chemistry and Materials Science
Differential equations
Electric fields
Entropy
Finite difference method
Fluid flow
Heat
Heat flux
Heat transfer
Inorganic Chemistry
Mathematical analysis
Measurement Science and Instrumentation
Micropolar fluids
Numerical integration
Optimization
Ordinary differential equations
Partial differential equations
Physical Chemistry
Polymer Sciences
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Summary:This paper is devoted to studying the thermal characteristics of a completely developed electrokinetic flow of micropolar fluid through a cylindrical microtube when a static electric field is applied to it. Due to the constant heat flux applied, the microtube wall is supposed to get heated continuously. In addition to this, the local thermal equilibrium (LTE) model is taken into account while analyzing the heat transfer phenomenon. Under low Reynolds numbers and long channel length approximations, the partial differential equations that describe the electrothermal flow of non-Newtonian micropolar fluid have been switched to ordinary differential equations. The finite difference method (FDM) is used to calculate velocity and temperature with second-order precision using uniform grids along the microtube’s radial direction. The Cavalieri–Simpson technique for numerical integration was used to get numerical values for the mean velocity, bulk mean temperature, and mean entropy/Bejan number. Variations in the Nusselt number for changes in velocity and temperature fields and fluctuations in the Bejan number due to heat transfer irreversibility have been presented. Moreover, a comprehensive study has been performed to discuss the impact of pertinent factors on the optimization of the system’s irreversibility through mean entropy generation analysis. Thermofluidic micropumps for chemical mixing/separation and biomicrofluidic devices for diagnostics may be designed using the results obtained from this study.
ISSN:1388-6150
1588-2926
DOI:10.1007/s10973-023-12538-x