Evaluation of Amount the Entropy Production Due to MHD Hybrid Nanofluid Conjugate Heat Transfer with Heat Absorption/Generation

Document Type : Original Article

Authors

1 Faculty of mechanical engineering, Yazd university

2 departmen of mechanical engineering

Abstract

In the present study, the entropy production due to the conjugate heat transfer of the hybrid nanofluid inside the K-shaped chamber under a uniform and non-uniform magnetic field under impact of a uniform heat absorption/generation is evaluated. Variations in the Rayleigh number, volumetric fraction of nanoparticles, Hartmann number, heat absorption/generation coefficient, thermal conductivity ratio, chamber aspect ratio and type of  applied  magnetic field have been studied. The outcomes showed that the flow strength and the amount of heat transfer could be reduced by about 55% and 21% by applying a magnetic field, respectively. By applying a non-uniform magnetic field compared to uniform mode, the flow strength can be increased up to about 38 and the average Nusselt number up to about 16%. Increasing the heat absorption/generation coefficient due to increasing the set temperature leads to decreasing the mean Nusselt number, which this influence increases with increasing the Hartmann number. Addition of nanoparticles to the base fluid in which the conduction of the phenomenon is predominant increases the rate of heat transfer. Heat transfer is a function of the ratio of thermal conductivity and Rayleigh number that increasing these two parameters increases the convection effects, and in this case, the effect of increasing the Hartmann number is more pronounced. Increasing the thermal conductivity ratio from 0.5 to 10 increases the amount of heat transfer by 21 times. Increasing the chamber aspect ratio leads to a decline in the mean Nusselt number and entropy production, but the effect of adding nanoparticles is greater in this case. Entropy production decreases with increasing Hartmann number and increases with Rayleigh number and heat absorption/generation coefficient.

Keywords

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Fluid Mechanics & Aerodynamics
Volume 10, Issue 2 - Serial Number 28
February 2022
Pages 141-168

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History

  • Receive Date: 31 December 2021
  • Revise Date: 24 January 2022
  • Accept Date: 26 February 2022
  • Publish Date: 20 February 2022

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