Effect of aspect ratio of a corrugated cavity filled with porous media on the coefficient of heat transfer.: Effect of aspect ratio of a corrugated cavity filled with porous media on the coefficient of heat transfer.

alaa darweesh; Zina K. Kadhim

doi:10.31185/ejuow.Vol10.Iss3.355

Authors

alaa darweesh master student
Zina K. Kadhim Mechanical Engineering Department, Wasit University, Iraq

DOI:

https://doi.org/10.31185/ejuow.Vol10.Iss3.355

Keywords:

ANSYS CFX; Numerical simulation; free convection; wavy-wall cavity; porous medium.

Abstract

Solar power, thermal storage facilities, reactor cooling and microelectronic devices are all examples of renewable energy use natural convection heat transfer from a heated supplier to a chilly environment or enclosure. The purpose of this research is to investigate the influence of porous media on the convective heat transfer coefficient and the modified Rayleigh number as a function of the cavity's aspect ratio. This study investigated the free convective 3D flow then heat transmission in a cavity that has a width of 20 cm in width, a depth of 2.7 cm in depth, and varying heights of 20, 25 and 30 cm. The cavity has an anisotropic fluid-filled porous wavy enclosure with steady-state incompressible flow. The bottom surface radiates heat with a steady heat flux. (300, 500, 700, 900, 1100 W/m²), while the top is exposed to the environment at 25 C˚ (h=25 W/m²) and other walls are adiabatic. Rayleigh’s number range (3.13* to 2.61* ) (1.9* ), aspect ratio (As=1,1.25,1.5), porosity (ɛ=0.36), permeability (k=7.593* m²), amplitude (a=1.5 cm). The findings indicate that increasing the heat flow alters the temperature profile. progressively increases the pressure and velocity. The highest value for the heat transfer coefficient and modified Rayleigh No. was obtained when the aspect ratio was 1.

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Effect of aspect ratio of a corrugated cavity filled with porous media on the coefficient of heat transfer.