摘要
微通道内流体流动与换热规律不同于常规尺度，这可归因于“贴壁层”流体分子与壁面相互作用的影响．当通道尺度小到与分子自由程可比时，贴壁层影响就不能忽略，贴壁层内流体的输运性质将不同于贴壁层以外流体的输运性质.在已求得贴壁层内气体粘度变化的基础上也同样可求得贴壁层内气体导热系数的变化．以此为基础，求解了微圆管内气体完全发展的层流换热。
When the dimensions of the flow passages are so small that it is comparable with the mean free path of the gas molecules, the change in transport property of the gas caused by the molecular interaction between wall and the gas in a thin layer adjacent to the wall surface would be prominent. Based on the former investigation on laminar flow of gas in microtubes, the thermal conductivity change of gas in wall-adjacent layer was conducted, andthe fully-developed laminar heat transfer of gas in microtubes was investigated theoretically.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
1998年第5期596-600,共5页
Journal of Engineering Thermophysics
关键词
微尺度
贴壁层
导热系数
层流换热
microtubes, wall-adjacent layer, thermal conductivity, laminar heat transfer
