Effects of Thermophoresis on Mass Transfer in a Linearly Stretching Permeable Surface with Mixed Convection

• Main Authors: Chia-Hung Wei, 魏家鴻
• Other Authors: Ruey-Yih Tsai
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/99479003215626130481

碩士 === 中原大學 === 機械工程研究所 === 95 === A theoretical study of the effect of thermophoresis on heat and mass transfer by mixed convection from a linearly stretching permeable surface is reported. Considering the two-dimensional mixed convection boundary layer flow over a vertically moving upward surface with suction or blowing at the surface. The governing equations include the continuity, momentum, energy and concentration equations. The solution methods are used similar transformation and dimensionless technique for the governing equations. In numerical analysis, the equations are solved by the Runge-Kutta integration method. When the mixed convection parameter increases, the velocity gradient increases. Thermal and concentration boundary layer thickness decrease as increase. Boundary layer thickness also decrease with suction effect. The effects of thermophoresis were predicted to be particularity important for particle moving toward a cold surface or blowing away a hot surface at a given temperature gradient.