Numerical modeling of free convection in a partially heated triangular enclosure with chamfer

Abstract

Two-dimensional numerical modelling of water natural convection inside a chamfered triangular cavity, that is being partially heated from below has been investigated in this paper. The walls of the cavity are considered isothermally isolated except a source part of heat which is inserted at the bottom wall while the inclined wall is considered as cold wall. A COMSOL Multiphysics 5.5 has been used to solve the numerical solutions. This paper considered some variables such as Rayleigh number (Ra = 103 to 106), heating length ratio (HL= 0.2, 0.4, and 0.5) and the ratio of the chamfer’s radius (R= 0.1, 0.2, and 0.25) while all other physical parameters are considered constant such as the length of the cold wall and the adiabatic wall. The results have been validated with previous published work in order to ensure the accuracy of the current coding. The main results observed an increase in streamlines and isotherms with the rise of Rayleigh (Ra) number and the rise of heating length ratio; additionally, the average Nusselt number (Nuavg) value increases with the rise of the Ra number and the length of the heating source. For example, average Nusselt number increased from 2.0443 at Ra=103 to 7.2793 at Ra= 106 for (R=0.25 and HL = 0.5).