水平管外沸腾强化换热的数值模拟与场协同分析

应用FLUENT软件对制冷剂R134a在光管和横纹槽管水平管外沸腾传热进行三维数值模拟，得到其饱和泡状沸腾过程中体积含气率的分布规律，并比较它们的换热系数。结果表明横纹槽管外侧能够很好地强化沸腾传热。此外，还通过改变边界条件分析质量流量、热流密度的变化对横纹槽管管外沸腾换热系数的影响。最后应用场协同理论，从局部换热角度分析其强化机制。研究表明，横纹槽管水平管外沸腾换热得到强化的原因是其凹槽前后的速度场与温度梯度场之间夹角较小，协同程度更好。

Field synergy analysis and numerical simulation of the enhanced boiling heat transfer outside the horizontal pipe

Simulates boiling heat transfer of R134a which flowed outside horizontal light tube and transversely-ridged tube numerically with FLUENT software. Gets the result of regularities of volumetric steam quality distribution during saturation process of boiling, comparison the heat transfer coefficient of transversely-ridged tube with that of light tube, the result shows that outside of transversely-ridged tube can intensify boiling heat transfer. Also analyzes different mass flow and heat flux density impact heat transfer coefficient by changing its boundary condition. Finally, from partial heat transfer, analyzes the strengthening mechanism by field synergy theory. Proves that the cause of strengthening heat transfer is the angle between velocity field and temperature gradient field more small at surrounding flute, synergy degree is preferable.