表面增强型强化管外蒸发换热特性实验研究

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．

Experimental study on evaporation outside the surface enhanced tubes

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.