Two-layer nanofluid flow and heat transfer in a horizontal microchannel with electric double layer effects and magnetic field

Zhao, Qingkai and Xu, Hang and Tao, Longbin (2020) Two-layer nanofluid flow and heat transfer in a horizontal microchannel with electric double layer effects and magnetic field. International Journal of Numerical Methods for Heat and Fluid Flow. ISSN 0961-5539 (https://doi.org/10.1108/HFF-08-2020-0513)

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Abstract

Purpose: The purpose of this paper is to investigate the immiscible two-layer heat fluid flows in the presence of the electric double layer (EDL) and magnetic field. The effects of EDL, magnetic field and the viscous dissipative term on fluid velocity and temperature, as well as the important physical quantities, are examined and discussed. Design/methodology/approach: The upper and lower regions in a horizontal microchannel with one layer being filled with a nanofluid and the other with a viscous Newtonian fluid. The nanofluid flow in the lower layer is described by the Buongiorno's nanofluid model with passively controlled model at the boundaries. An appropriate set of non-dimensional quantities are used to simplify the nonlinear systems. The resulting coupled nonlinear equations are solved by using homotopy analysis method. Findings: The present work demonstrates that increasing the EDL thickness and Hartmann number can restrain the fluid flow. The Brinkmann number has a significant role in the enhancement of heat transfer. It is also identified that the influence of EDL effects on microflow cannot be ignored. Originality/value: The effects of viscous dissipation involved in the heat transfer process and the body force because of the EDL and the magnetic field are considered in the thermal energy and momentum equations for both regions. The detailed derivation procedure of the analytical solution for electrostatic potential is provided. The analytical solutions can lead to improved understanding of the complex microfluidic systems.

  • Item type:Article
    ID code:75376
    Dates:
    Date
    Event
    30 December 2020
    Published
    24 October 2020
    Accepted
    Subjects:Technology > Mechanical engineering and machinery
    Department:UNSPECIFIED
    Depositing user: Pure Administrator
    Date deposited:11 Feb 2021 12:29
    Last modified:17 Apr 2024 00:43
    URI:https://strathprints.strath.ac.uk/id/eprint/75376
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