Three dimensional numerical investigations on the heat transfer enhancement in a triangular facing step channels using nanofluid

[摘要] In this paper, laminar flow for the distilled and SiO2-water nanofluid flow and heat transfer were numerically investigated in three-dimensional triangular facing-step channel. The nanoparticle volume fraction and Reynolds number considered are in the range of 0-1% and 100-1500, respectively. Numerical solutions are obtained by using finite difference method to solve the governing equations. The effects of the volume fraction of nanoparticle, triangular facing-step channel amplitude height, wavelength and Reynolds number on local skin-friction coefficient, average Nusselt number and enhancement of heat transfer are presented and discussed. The results show that the Nusselt number and friction coefficient increases as the amplitude height of triangle channel increases. As the nanoparticle volume fraction increases, the Nusselt number is also found to be significantly increased, accompanied by only a slight increase in the friction coefficient. In addition, it is found that the heat transfer enhancement mainly depends on the amplitude height of the triangle wall, nanoparticle volume fraction and Reynolds number rather than the wavelength.

[发布机构] Department of Aerospace Engineering, Universiti Putra Malaysia, Malaysia^1;Department of Mechanical Engineering, College of Engineering, Universiti of Anbar, Anbar, Iraq^2;Aerospace Manufacturing Research Centre, Universiti Putra Malaysia, Malaysia^3;Department of Mechanical and Manufacturing Engineering, Universiti Putra Malaysia, Malaysia^4

[学科分类] 航空航天科学

[关键词] Enhancement of heat transfer;Friction coefficients;Governing equations;Heat Transfer enhancement;Local skin-friction coefficient;Nanoparticle volume fractions;Numerical investigations;Numerical solution