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中文摘要：
对直径为0．531，0．834，1．042和1．931mm的圆形微通道内液氮的单相流动和传热进行了实验研究。在10，000～90，000的高雷诺数范围内，测量了流动摩擦系数、局部和平均对流换热系数。结果表明，流动摩擦系数随微通道壁面粗糙度的增加而变大。微通道中局部对流换热系数受到液氮导热系数变化的影响沿管程逐渐下降约12．5％。传统的Gnielinski换热关联式经过流动摩擦系数的修正后与实验换热系数符合较好。
英文摘要：
Experiments were preformed to investigate the flow and heat transfer characteristics for single-phase flow of liquid nitrogen in micro-tubes with the diameters of 0.531, 0.834, 1.042 and 1.931 mm. In high Reynolds number range of 10,000～90,000, the flow friction factor, local and average convection heat transfer coefficients were determined. It is found that flow friction factor increases with increasing surface roughness of micro-tubes. Local convection heat transfer coefficient decreases along the micro-tube by 12.5% for the influence of thermal conductivity of liquid nitrogen. Heat transfer is enhanced with the decrease of tube diameter, and the measured heat transfer coefficients accord with Gnielinski correlation modified by flow friction factor.
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