Transient Mixed Convection Heat and Mass Transfer with Chemical Reaction along a Vertical Wavy Plate in a Micropolar Fluid

化學反應作用下微極流體在波形板表面之暫態混合熱與質量傳遞

陳朝光(Cha'o-Kuang Chen) ； 王怡然(I-Jan Wang) ； 鄭慶陽(Ching-Yang Cheng)

《中國機械工程學刊》 28卷1期 (2007/02) Pp. 71-80

https://doi.org/10.29979/JCSME.200702.0009

摘要

本文應用座標轉換與三次樣線定置法研究化學反應作用下微極流體在波形板表面之暫態混合對流熱與質量傳遞。探討化學反應參數、渦旋黏度參數、熱浮力數、濃度浮力數、普郎特數及施密特數等參數對暫態局部紐塞爾數與希爾吾德數之影響。混合對流邊界層中，在靠近板前緣處或一開始很短時間內，強迫對流是熱與質量傳遞之主要模態；而在板之更下游處或經過較長時間時，自然對流則是熱與質量傳遞之主要模態。增大生成化學反應會增加表面熱傳遞而減少質量傳遞。

並列摘要

The transient mixed convection heat and mass transfer with chemical reaction along a vertical wavy surface in micropolar fluids is studied by the coordinate transformation and the cubic spline collocation method. Effects of chemical reaction parameter, vortex viscosity parameter, thermal buoyancy number, concentration buoyancy number, Prandtl number, and Schmidt number on the transient local values of Nusselt number and Sherwood number are presented. In a mixed convection boundary layer, forced convection is the dominant mode of heat and mass transfer near the leading edge or at small time, while in regions farther downstream or at large time, natural convection becomes the dominant mode of heat and mass transfer. Increasing the generative chemical reaction parameter increases the surface heat transfer rate and decreases the surface mass transfer rate.

並列關鍵字

wavy plate ； micropolar fluid ； mixed convection ； heat transfer ； chemical reaction