输油管道对流换热系数模型

摘要

The heat loss of the hot oil pipeline is very high, so it is of great practical value. A model for con-vective heat transfer coefficient in petroleum is proposed, and then the overall heat transfer coefficient is analyzed. The results show that, the convective heat transfer coefficient always has a great impact on the overall heat transfer of the pipeline.%热油管道能耗巨大,其散热问题的研究具有极高的工程应用价值.尽管在很多情况下流体与管壁间的对流换热系数很大,可以在总传热系数计算中忽略对流换热系数的影响,但并不总是如此.主流与近壁边界间的过渡区、即热边界层内的换热是不可忽略的.采用动量热量比拟的方法建立输油管道对流换热系数模型,并在此基础上对总传热系数进行了分析计算.计算结果表明,边界层内的对流换热系数对管道的总传热系数具有较大影响.