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首页> 外文期刊>International Journal of Heat and Mass Transfer >Convective boiling of R-123/oil mixtures on enhanced tube bundles having pores and connecting gaps
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Convective boiling of R-123/oil mixtures on enhanced tube bundles having pores and connecting gaps

机译：R-123 /油混合物在具有孔和连接间隙的增强管束上的对流沸腾

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摘要

The effect of enhanced geometry (pore diameter, gap width) on convective boiling of R-123/oil mixture was investigated. Three enhanced tube bundles as well as a smooth tube bundle were tested. Test range covered oil concentration, heat flux, mass flux and vapor quality. Significant heat transfer degradation is observed for the present enhanced tubes. Compared with the pool boiling counterpart, however, the heat transfer degradation is much smaller. The two-phase convection in a bundle may remove the oil-rich layer near the heating surface, and reduce the thermal degradation by oil. Of the three enhanced geometries, tube with the largest pore diameter (correspondingly larger gap width) shows the smallest degradation. However, d_p = 0.23 mm tube, which yielded the highest heat transfer coefficient with pure refrigerant, maintains the highest heat transfer coefficient even with oil. Correlations, which account for the heat transfer degradation with heat flux, oil concentration and enhanced geometry as parameters, were developed.
机译：研究了增强的几何形状（孔径，间隙宽度）对R-123 /油混合物对流沸腾的影响。测试了三个增强的管束以及光滑的管束。测试范围涵盖了油浓度，热通量，质量通量和蒸气质量。对于本发明的增强管，观察到显着的热传递降解。但是，与池沸腾对应物相比，传热降级要小得多。束中的两相对流可以去除加热表面附近的富油层，并减少因油引起的热降解。在这三种增强的几何形状中，具有最大孔径（相应地较大的间隙宽度）的管显示出最小的退化。但是，d_p = 0.23 mm的管（在纯制冷剂下产生最高的传热系数）即使在油下也保持最高的传热系数。建立了相关性，该相关性考虑了以热通量，油浓度和增强的几何形状为参数的传热降解。

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