表面增强型强化管外蒸发换热特性实验研究

Experimental study on evaporation outside the surface enhanced tubes

介绍了表面增强型蒸发强化管,并对氟利昂制冷工质R22在该管外的沸腾换热进行了实验研究.实验通过对4根不同管型的蒸发强化管进行对比,分析了不同管型参数对管外换热系数的影响.得出结论:4根强化管的总传热系数随流速变化的趋势有所不同;1#管和3#管的总传热系数在实验流速范围内相差不大;4#管的总传热系数随流速的变化曲线最为平坦;2#管是4根管子中总传热系数随流速变化最大的一根管子.

The experimental study on the performance of nucleate boiling of R22 outside the surface enhanced evaporation tubes was conducted by use of four two-sides enhanced tubes with different geometries. The test results show that： four enhanced tubes different overall heat transfer coefficients; the overall heat transfer coefficients increase with the increasing heat flux;among the fourenhanced tubes, the tube 2 and tube 4 have the best heat transfer capability.