Fluid Mechanics & Aerodynamics

Fluid Mechanics & Aerodynamics

Numerical Simulation of Nanofluid Conjugate Heat Transfer in 2D Microchannel under the influence of Transverse Magnetic Field: influence of Nanoparticle Diameter, Reynolds Number and viscous dissipation

Document Type : Original Article

Authors
Fatemeh Besharati
Omid Jahanian
Babol Noshirvani University of Technology
Abstract
In the present study, the effect of viscousdissipation on the flow and conjugate heat transfer of water-alumina nanofluid in a two-dimensional microchannel under the influence of a magnetic field is investigated, using the incompressible lattice Boltzmann method.The upper wall of the microchannel is insulated and uniform heat flux is imposed on the lower wall of the solid region. The investigation has been carried out at Reynolds numbers of 50, 75 and 100, for a nanofluid with 2% volume fraction. The nanoparticle diameters varied from 10 to 50 nm and variable Hartmann numbers ranging from 0 to 30 were considered. The results showed that in the case of ignoring viscous dissipations, using a magnetic field in conjugate heat transfer does not have a significant negative effect on the average Nusselt number, and despite the usual expectation, can increase the Nusselt number, especially at higher Reynolds numbers. It is also noted that the average Nusselt number when ignoring the viscous dissipations, is higher than when these dissipations are taken into account. Hence, the highest Nusselt number in this case, is observed at Reynolds and Hartmann number values of 100 and 30, respectively.
Keywords
Lattice Boltzmann method
Conjugate Heat Transfer
Nanofluid
Magnetic Field
Viscous Dissipations
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Fluid Mechanics & Aerodynamics
Volume 9, Issue 2 - Serial Number 26
Autumn and Winter
November 2021
Pages 79-100

  • Receive Date 04 November 2019
  • Revise Date 29 August 2020
  • Accept Date 28 June 2020
  • Publish Date 29 November 2021