Marangoni abnormal convection heat transfer of power-law fluid driven by temperature gradient in porous medium with heat generation

2016 ◽  
Vol 92 ◽  
pp. 700-707 ◽  
Author(s):  
Chengru Jiao ◽  
Liancun Zheng ◽  
Yanhai Lin ◽  
Lianxi Ma ◽  
Goong Chen
Keyword(s):  
Heat Transfer ◽  
Porous Medium ◽  
Temperature Gradient ◽  
Heat Generation ◽  
Power Law ◽  
Convection Heat Transfer ◽  
Convection Heat ◽  
Power Law Fluid

scholarly journals MHD Heat Transfer in W-Shaped Inclined Cavity Containing a Porous Medium Saturated with Ag/Al2O3 Hybrid Nanofluid in the Presence of Uniform Heat Generation/Absorption

Energies ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3457 ◽  
Author(s):  
Mohamed Dhia Massoudi ◽  
Mohamed Bechir Ben Hamida ◽  
Hussein A. Mohammed ◽  
Mohammed A. Almeshaal
Keyword(s):  
Heat Transfer ◽  
Porous Medium ◽  
Aspect Ratio ◽  
Heat Generation ◽  
Heat Transfer Performance ◽  
Convection Heat Transfer ◽  
Hybrid Nanofluid ◽  
Transfer Performance ◽  
Convection Heat ◽  
Uniform Heat

In this paper, a 2D numerical study of natural convection heat transfer in a W-shaped inclined enclosure with a variable aspect ratio was performed. The enclosure contained a porous medium saturated with Ag/Al2O3 hybrid nanofluid in the presence of uniform heat generation or absorption under the effect of a uniform magnetic field. The vertical walls of the enclosure were heated differentially; however, the top and bottom walls were kept insulated. The governing equations were solved with numerical simulation software COMSOL Multiphysics which is based on the finite element method. The results showed that the convection heat transfer was improved with the increase of the aspect ratio; the average Nusselt number reached a maximum for an aspect ratio (AR) = 0.7 and the effect of the inclination was practically negligible for an aspect ratio of AR = 0.7. The maximum heat transfer performance was obtained for an inclination of ω = 15 and the minimum is obtained for ω = 30 . The addition of composite nanoparticles ameliorated the convection heat transfer performance. This effect was proportional to the increase of Rayleigh and Darcy numbers, the aspect ratio and the fraction of Ag in the volumetric fraction of nanoparticles.

Magnetohydrodynamics Thermocapillary Marangoni Convection Heat Transfer of Power-Law Fluids Driven by Temperature Gradient

2013 ◽  
Vol 135 (5) ◽  
Author(s):  
Yanhai Lin ◽  
Liancun Zheng ◽  
Xinxin Zhang
Keyword(s):  
Heat Transfer ◽  
Temperature Gradient ◽  
Differential Equations ◽  
Power Law ◽  
Numerical Solutions ◽  
Marangoni Convection ◽  
Convection Heat Transfer ◽  
Temperature Fields ◽  
Convection Heat ◽  
Power Law Fluids

This paper presents an investigation for magnetohydrodynamics (MHD) thermocapillary Marangoni convection heat transfer of an electrically conducting power-law fluid driven by temperature gradient. The surface tension is assumed to vary linearly with temperature and the effects of power-law viscosity on temperature fields are taken into account by modified Fourier law for power-law fluids (proposed by Pop). The governing partial differential equations are converted into ordinary differential equations and numerical solutions are presented. The effects of the Hartmann number, the power-law index and the Marangoni number on the velocity and temperature fields are discussed and analyzed in detail.

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