【摘要】 针对非圆截面小通道流动沸腾换热研究报道较少的现状,以R113为工质,对4种不同水力直径的正方形、三角形截面小通道内的流动沸腾换热特性进行试验研究,试验参数范围:入口干度,过冷～1.0;质量流速400～3 300 kg/(m2.s);热流密度20～150 kW/m2,并将试验结果与相近水力直径的圆通道内流动沸腾试验结果进行了对比分析。试验结果表明:非圆小通道内饱和流动沸腾局部壁面温度与质量流速密切相关,并受热负荷与流动沸腾换热状况的影响;质量流速和壁面热负荷是非圆小通道内流动沸腾换热特性的主要影响因素;与相近水力直径的圆通道内流动沸腾试验数据对比显示,非圆截面小通道具有明显的强化传热作用。更多还原

【Abstract】 As only few reports on flow boiling heat transfer in non-circular minichannels are published,flow boiling heat transfer characteristics of R113 in square-and triangular-section minichannels are experimentally investigated.The experiments are performed with the inlet vapor quality ranging from super-cooling to 1.0,mass velocity from 400 to 3 300 kg/(m2.s),and heat flux from 20 to 150 kW/m2.And the experimental data are compared and analyzed with those in circular minichannel hav-ing close hydrodynamics diameter.The results show that thelocal wall temperature depends heavily on the mass velocity in non-circular channel flow boiling,which is affected by the heat flux and the mechanism of flow boiling heat transfer.Both mass velocity and heat flux could effect on the mean heat transfer coefficient of saturated flow boiling in non-circular minichan-nels.According to the experimental data in both non-circular and circular minichannel with nearly equal hydrodynamic di-ameter,the non-circular minichannels appear to have remark-able heat transfer enhancement effect.更多还原