Heat Transfer Characteristic of Supercritical Pressure Water in Nonuniform Heating Vertical Tube

In this paper,experiment is carried out to get the heat transfer characteristic of supercritical pressure water in nonuniform heating vertical tube.The test parameters are as: p=23～30 MPa,G=600～ 1 200 kg/（m².s） and q=200～600 kW/m².The results show that for the nonuniform heating situation,the coefficient of the nonuniform heating tube can be calculated using the uniform heating tube formula with the same average heat flux;when heat transfer deterioration occurs,the wall temperature rises of nonuniform circumferential distribution of heat flux and heat transfer coefficient tend to uniformity with the increasing of Re number;at the same tube cross section the heat transfer enhancement and deterioration may occur at the same time and the heat transfer deterioration is determined by the local heat flux;the average heat transfer heating tube is lower than the uniform heating tube.