热流密度对立式螺旋管内气液两相流摩擦阻力特性的影响

Influence of Heat Flux on Frictional Resistance of Air-Water Two-Phase Flow in Vertical Spiral Tube

在气液两相流体模型的基础上,对立式螺旋管内气液两相流体进行了数值模拟,探究了热流密度对管内摩擦阻力的影响。研究表明:在低压低质量流速下,摩擦阻力降、分液相摩擦阻力系数L都随着热流密度的增大而增大;传热系数随着热负荷的增大而显著增大,在热负荷一定的情况下,传热系数随干度的增大而减小;换热器的综合性能在不同的热流密度条件下相差不大。研究结论对立式螺旋管内气液两相流摩擦阻力问题的研究有一定的参考价值。

Based on fuid model of gas-liquid two-phase, the fliud in vertical spiral tube was simulated, and the influence of heat flux on frictional resistance inside the tube was studied. The results show that under low pressure and low mass velocity, both friction pressure drop and frictional resistance coefficient increase with the increasing heat flux. Heat transfer coefficient increases obviously with the increasing thermal load, and decreases with the increasing dryness under certain thermal load. The performance of heat exchanger keeps invariant under different heat flux. The research can provide a good support for frictional resistance study of gas-liquid two-phase in spiral tube.