叉排三维外肋管的传热特性

Heat transfer of staggered three-dimensional externally finned tube

以纯净水为换热工质,空气为换热气体,搭建了换热实验台。对光管和叉排三维外肋管进行了传热实验研究。详细介绍了传热实验台的搭建以及实验步骤,并为求解传热系数进行了理论模型的推导。结果发现,由于叉排三维外肋管的特殊结构,相同条件下其传热系数是光管传热系数的3.1倍左右。对光管和外肋管的传热系数进行线性拟合,得到了各自的换热关联式,为叉排三维外肋管的工业应用提供了参考。最后对实验数据进行了误差分析,实验数据可信。

Heat transfer test rig had been built with pure water as heat transfer medium and air as heat transfer gas. Heat transfer experimental investigation on circle tube and staggered three-dimensional externally finned tube had been carried out. The building of test rig and experimental procedure had been introduced in details accompany with the theoretical model being derived for solving heat transfer coefficients. It was found that due to the special structure of staggered three-dimensional externally finned tube, its overall heat transfer coefficient is 3.1 times bigger than that of circular tube. By a linear regressive method, the experimental data were processed. The criterion relations of heat transfer were obtained and compared with circular tube. The results could provide reference for the industrial application. Finally, the deviation of the experimental data is analyzed and the result is believable.