Abstract:

To simulate the heat process of propane in the intermediate fluid vaporizer(IFV),the test rig has been designed and built.Using water as the heat source,cold nitrogen as cold source,the boiling heat transfer and condensing heat transfer experiments of propane were conducted in two smooth concentric circular tubes.Inlet water temperature,water mass flow rate and gradient of tubes were analyzed to see how those factors affeted.With the increase of heat flux,the boiling heat transfer coefficient of propane increases and the tendency goes gentle.The boiling heat transfer coefficient is bigger in declining tubes.The experimental results show the same trend with prediction results from Cooper equation,with 30% of deviation.With the increase of wall sub-cooling,the condensation heat transfer coefficient of propane decreases and the tendency becomes gentle.The condensation heat transfer coefficient of propane is slightly bigger in declining tubes.The experimental results show the same trend with prediction results from Nusselt equation,with 40% of deviation.

Key words: propane, heat transfer, evaporation, condensation, experimental study

摘要：

为了模拟中间流体气化器(IFV)中中间介质丙烷的换热情况,设计并搭建了一个IFV换热模拟实验台。采用水作为热源,冷氮气为冷源,在两个套管式光滑圆管中进行了丙烷的沸腾和冷凝换热实验,分析了水入口温度、水流量和实验管倾斜程度对丙烷换热的影响。结果发现丙烷的沸腾传热系数随着热通量的增大而增大,换热管倾斜时,其换热有所增强,实验值与Cooper方程对其换热的预测值的变化趋势是一致的,误差基本在30%以内。丙烷的冷凝传热系数随着壁面过冷度的增大而减小,传热管倾斜时,其换热也有所增强,传热系数的实验值和Nusselt方程预测值的变化趋势一致,误差在40%以内。

关键词: 丙烷, 传热, 蒸发, 冷凝, 实验研究