三维内肋管换热及流阻的实验研究

EXPERIMENTAL INVESTIGATION OF PRESSURE DROP AND HEAT TRANSFER OF THREE-DIMENSIONAL INTERNALLY FINNED TUBES

一、前言 为使换热设备更加轻小高效,各国学者着力研究了强化传热技术。近年研制出的不少高效传热表面已在空冷、海水淡化、化工、宇航、船舶、动力工程等方面得到应用。 强化管内对流换热的主要手段是促进管内湍流和扩展管内换热面积。R.L.

Under the condition of air being cooled, the experiments on the convective heat transfer and pressure drop of three-dimensional internally finned tubes (3IFT) have been performed. By means of the least square method, two correlations about turbulent heat transfer and friction characteristics of 3IFT have been obtained. The experimental data show that the heat transfer augmentation ratio of 3IFT can be up to 280%. The thermal-hydraulic performance coefficient of 3IFT is as high as 180%. 3IFT are excellent new tubes for enhancing heat transfer.