On predicting the onset of transient convection in porous media saturated with Non-Newtonian liquid

29th Symposium of Malaysian Chemical Engineers 2016

Tan, K.K.^1 ; Pua, S.Y.^2 ; Yang, A.^3

ELM Graduate School, HELP University, Kuala Lumpur

50490, Malaysia^1

Department of Chemical Engineering, University Putra, Serdang, Selangor

43400, Malaysia^2

Department of Mechanical Engineering, Hertfordshire University, Hatfield

AL10 9EU, United Kingdom^3

关键词: Apparent viscosity;    Convection in porous medias;    Critical Rayleigh number;    Rayleigh number;    Theoretical values;    Thermal boundary conditions;    Transient convection;    Transient heat conduction;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/206/1/012029/pdf
DOI  :  10.1088/1757-899X/206/1/012029

来源: IOP

【 摘 要 】

The onset of transient convection in non-Newtonian liquid immersing porous media was simulated using a Computational Fluid Dynamics (CFD) package for the thermal boundary condition of Fixed Surface Temperature (FST). Most of the simulated values of stability criteria were found to be in good agreement with the predicted and theoretical values of transient critical Rayleigh number for non-Newtonian liquid defined by Tan and Thorpe (1992) for power-law fluids. The critical transient Rayleigh numbers for convection in porous media were found to be in good agreement with theoretical values by using apparent viscosity μapp at zero shear. The critical time and critical depth for transient heat conduction were then determined accurately that.