Vol.68, No.1, 2021, pp.319-336, doi:10.32604/cmc.2021.015710
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ARTICLE
Numerical Solutions for Heat Transfer of An Unsteady Cavity with Viscous Heating
  • H. F. Wong1,2, Muhammad Sohail3, Z. Siri1, N. F. M. Noor1,*
1 Institute of Mathematical Sciences, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
2 Unit of Engineering Design and Product Development, Technology and Engineering Division, Malaysian Rubber Board, 47000 Sungai Buloh, Malaysia
3 Department of Applied Mathematics & Statistics, Institute of Space Technology, 44000 Islamabad, Pakistan
* Corresponding Author: N. F. M. Noor. Email:
(This article belongs to this Special Issue: Role of Computer in Modelling & Solving Real-World Problems)
Received 03 December 2020; Accepted 15 January 2021; Issue published 22 March 2021
Abstract
The mechanism of viscous heating of a Newtonian fluid filled inside a cavity under the effect of an external applied force on the top lid is evaluated numerically in this exploration. The investigation is carried out by assuming a two-dimensional laminar in-compressible fluid flow subject to Neumann boundary conditions throughout the numerical iterations in a transient analysis. All the walls of the square cavity are perfectly insulated and the top moving lid produces a constant finite heat flux even though the fluid flow attains the steady-state condition. The objective is to examine the effects of viscous heating in the fully insulated lid-driven cavity under no-slip and free-slip Neumann boundary conditions coupled with variations in Reynolds and Prandtl numbers. The partial differential equations of time-dependent vorticity-stream function and thermal energy are discretized and solved using a self-developed finite difference code in MATLAB environment. Time dependence of fluid thermodynamics is envisaged through contour and image plots. A commercial simulation software, Ansys Fluent utilizing a finite element code is employed to verify the finite difference results produced. Although the effect of viscous heating is very minimal, Neumann no-slip and free-slip boundary conditions are able to trap the heat inside the fully insulated cavity as the heat flux is constantly supplied at the top lid. A lower Reynolds number and a greater Prandtl number with free-slip effects reduce temperature distribution in the cavity with a faster velocity than in the no-slip condition as the free-slip behaves as a lubricant.
Keywords
Lid-driven; viscous heating; vorticity-stream function; finite difference method; finite element method
Cite This Article
H. F. Wong, M. Sohail, Z. Siri and N. F., "Numerical solutions for heat transfer of an unsteady cavity with viscous heating," Computers, Materials & Continua, vol. 68, no.1, pp. 319–336, 2021.
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