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首页> 外文会议>International Symposium on Multiphase Flow, Heat Mass Transfer and Energy Conversion >Experimental Study on Boiling Heat Transfer and Two-phase Frictional Pressure Drop Characteristics of Glycol-Water Solution in a Vertical Porous Surface Tube
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Experimental Study on Boiling Heat Transfer and Two-phase Frictional Pressure Drop Characteristics of Glycol-Water Solution in a Vertical Porous Surface Tube

机译：垂直多孔表面管中醇 - 水溶液沸腾热传递和两相摩擦压降特性的实验研究

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Although much research has been conducted on investigating the flow boiling heat transfer of low saturation temperature refrigerants, there are few experimental data and theory about the flow boiling heat transfer of high saturation temperature organic mixture which exists widely in the petrochemical industry. To investigate the characteristics of flow boiling heat transfer of high saturation temperature organic mixture, experiments of glycol-water solution flow boiling in a vertical porous surface tube and a vertical smooth tube are conducted. Test tubes are uniformly heated by electrical current with a heated length of 2,000 mm. The mass flux in the experiment ranges from 500 to 1,500t·h~(-1) and the heat flux on test tubes ranges from 10 to 40 kW·m~(-2). The flow boiling heat transfer coefficients and two-phase frictional pressure drops of the two types of tubes are obtained and compared. The results indicate that: the flow boiling heat transfer coefficient in the porous surface tube is 3.8～5.7 times of that in smooth tube and the pressure drop of the porous surface tube is 0.99～1.007 times of that in the smooth tube. The physical mechanisms of the enhanced heat transfer characteristics of flow boiling in the porous surface tube are analyzed. By the regression analysis of the experimental data, correlations predicting the flow boiling heat transfer coefficient and pressure drop of glycol-water solution within the error range of ±20% are established. The experimental results can be used to guide the design of heat exchange equipment using the porous surface tube as heat transfer elements under these test conditions.
机译：虽然在研究低饱和温度制冷剂的流沸腾热传递上进行了许多研究，但很少有实验数据和关于石油化工工业中广泛存在的高饱和温度有机混合物的流沸热传热的实验数据和理论。为了研究高饱和温度有机混合物的流沸热传递的特性，对垂直多孔表面管和垂直光滑管进行沸腾的二醇水溶液流动的实验。试管通过电流均匀加热，电流具有2,000mm的加热长度。实验中的质量通量范围为500至1,500t·h〜（-1），试管上的热通量范围为10至40 kW·m〜（-2）。获得并比较了两种管的流沸腾传热系数和两相摩擦压降。结果表明：多孔表面管中的流动沸腾传热系数为3.8〜5.7倍，在光滑的管中，多孔表面管的压降是光滑管中的0.99〜1.007倍。分析了多孔表面管中流动沸腾的增强传热特性的物理机制。通过对实验数据的回归分析，建立了预测±20％误差范围内的醇沸热系数和乙二醇水溶液的流沸热系数和压降的相关性。实验结果可用于指导在这些试验条件下使用多孔表面管作为传热元素的热交换设备的设计。

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