浮升力对管内水过冷流动沸腾传热特性的影响研究

基于已知的2087组水的过冷流动沸腾传热实验数据，通过努塞尔数(Nu)和格拉晓夫数(Gr)的关系探讨了不同流动方向和加热方式下浮升力对过冷流动沸腾传热性能的影响。对上壁面单边加热水平矩形管内过冷流动沸腾传热进行了实验研究。实验结果表明，向上的浮升力阻碍了气泡向流体中的扩散，使得传热恶化。在增加流速、增大压力和减小过冷度的条件下，Nu均随Gr增加，使过冷流动沸腾传热得到强化。

Investigation on the effect of buoyancy on the subcooled flow boiling heat transfer characteristics of in tube waters

Based on the known experimental data of 2087 groups of subcooled flow boiling heat transfer of water, the influence of buoyancy on their performance in different flow directions and heating modes were discussed with the relationship between Nusselt number(Nu) and Grashov number(Gr). Experimental study on subcooled flow boiling heat transfer in a horizontal rectangular tube with unilateral heating of the upper wall was carried out. The experimental results show that the upward buoyancy hinders the diffusion of bubbles into the fluid, which makes the heat transfer worse. Under the conditions of increasing flow velocity, increasing pressure and decreasing subcooling degree, Nu increases with Gr, which enhances the subcooled flow boiling heat transfer.