非均匀加热条件下内插扭带管强化传热模拟分析

以水为工作介质，采用欧拉多相流模型和非平衡沸腾模型，当流速在0.3~0.7m·s^-1范围内、工作压力为4.5MPa、热流密度为2MW·m^-2时，数值模拟了内插扭带管和光管管内流动过冷沸腾传热。对比了两种管道的换热系数、气泡份额、流动速度、流场流线、固体组件温度和压降，分析了内插扭带管的综合性能。结果表明，与光管相比较，内插扭带管的换热系数提高约6%~90%，压降增大约200%~250%，得到流速在0.4~0.6m·s^-1范围内时内插扭带管的综合性能评价因子η为1.1~1.3。

Simulation analysis of enhanced heat transfer of tube with twisted tape inserts under non-uniform heating

When water is set as the working medium, the Euler multiphase flow model and non-equilibrium boiling model are adopted, the flow velocity is in the range of 0.3~0.7m·s^-1, the working pressure is 4.5MPa, and the heat flux density is 2MW·m^-2, the subcooled boiling heat transfer in the tube with twisted tape inserts and plain tube has been simulated numerically. The heat transfer coefficient, void fraction, flow velocity, flow field streamline, solid component temperature and pressure drop of two kinds of tubes were compared, and the comprehensive performance of the tube with twisted tape inserts has been analyzed. The results show that the heat transfer coefficient of the tube with twisted tape inserts increases by 6% to 90% or so, and the pressure drop increases by about 200% to 250%, compared with the plain tube. When the flow velocity is in the range of 0.4~0.6m·s^-1, the comprehensive performance evaluation factor η of the tube with twisted tape insert is 1.1~1.3.