Analysis of the Surface Convective Heat Transfer Coefficient of Icicle on Transmission Lines

Abstract

In order to study the growth mechanism of icicle on ice-covered transmission lines, we studied a key parameter for icing accretion, namely, the surface convective heat transfer coefficient of icicle, and established a multi-icicle model for the ice-covered transmission line. The effects of the ice coverage and the distance between the icicle and the length of the icicle on the heat transfer coefficient were analyzed by means of numerical simulation, and a special device was designed to verify the experiments. The results show that the surface heat transfer coefficient of the icicle decreases with the increase of ice thickness or the distance between the icicle within the studied parameters range, but hardly changes with the change of the icicle length. The results of numerical simulation of convective heat transfer coefficient on icicle are basically consistent with the experimental results, and the difference is 6%~10%, while the difference between the results of the traditional empirical formula and the experimental results is 9%~29%. Compared with the traditional empirical formula, the numerical simulation method has higher accuracy, which is more conducive to the study of icicles growth model.