微肋管单相对流换热实验研究

Experimental Research on Single Phase Convection Heat Transfer in Micro-Fin Tube

以单相水为介质,对3种不同微肋高度的微肋管的换热与阻力特性进行了实验研究。根据工程实际的需要,对微肋管在实验范围内的强化换热效率指标进行评价,确定了微肋管的最佳工作区域。在此基础上,通过实验数据回归得到微肋管换热与阻力的经验关系式。结果表明,微肋管对于紊流区的单相对流换热有很好的强化作用,且换热系数增加幅度高于阻力增加幅度。本文回归得到的经验关系式具有很高的计算精度,且计算值与实验值间偏差很小。

An experimental investigation of heat transfer and flow resistance characteristics of single phase water in three micro-fin tubes with different fin height was conducted.At the same time,the efficiency of micro-fin tubes within the experimental scope was evaluated and the optimal working region was determined.Based on the experimental data in the optimal working region,correlations for predicting the heat transfer and flow resistance were also given by multiple regression method.The result indicates that the micro-fin tubes can greatly enhance the single-phase heat transfer in turbulent flow,and the increase of heat transfer coefficient is higher than the increase of flow resistance.The accuracy of the correlation is very high,of which the deviation from the experimental value is very small.