垂直管内高沸点工质异丙苯流动沸腾换热与阻力

Flow boiling heat transfer and pressure drop of high saturation temperature organic fluid cumene in vertical tube

对垂直管内高沸点有机工质异丙苯的流动沸腾换热与摩擦压降特性进行了实验研究,获得了换热系数与摩擦压降沿流动方向的变化情况,并与前人模型的计算值进行了比较。实验过程中质量流速为382—786 kg/(m2.s),实验工况干度为0.1—0.6,压力为0.21—0.27 MPa。通过对实验数据的回归分析,获得了换热系数与摩擦压降的计算关联式。在对复杂的非线性方程进行回归分析时,提出了一种简单的迭代分析方法。研究结果丰富了高沸点工质的流动沸腾换热数据,为石化行业中换热器的设计提供了依据,并为强化凝结换热器的开发和性能测试提供了比较基准。

The experiments on flow boiling heat transfer in saturation temperature organic fluid cumene. Heat transfer a vertical smooth tube were carried out with high coefficients and frictional pressure drops vs. Vapo quality were measured and compared with the calculated values from previous investigators＇ models obtained by experiments of low saturation temperature fluid. Test parameters include the fluid mass flux of 382-786 kg/（ m^2 · s）, the vapor quality for all runs of 0.1-0. 6 and evaporating pressure of 0. 21-0. 27 MPa. From the experimental results, the correlations of heat transfer coefficients and frictional pressure drops are obtained in consideration of fluid chemical molecular formula. A simple iteration method is proposed for the complex nonlinear regression analysis of heat transfer data. The obtained results provide additional data for the database that mainly contains data about flow boiling of low saturation temperature refrigerants.