波纹管内流动与传热三维数值模拟

应用三维变物性层流模型及低雷诺数湍流模型分别对波纹管及光管管内流动与传热性能进行了模拟研究,并通过实验结果进行了验证。数值模拟表明，所研究的波纹管内层流向湍流过渡的雷诺数范围为600～800，波纹管的波纹起伏使得管内的流动变得复杂，产生了有利于传热强化的二次涡流。在低雷诺数下波纹管的综合传热性能不及光管，而在高雷诺数下。波纹管综合传热性能逐渐得到改善。通过数值计算获得了波纹管最优波纹高度参数为ε=1.16。

Numerical Study on Convective Heat Transfer and Pressure Drop of Corrugated Tube

The fluid flow and heat transfer inside corrugated tubes was studied numerically, using the laminar and turbulent models,in which the JL low Re k-ε turbulence model was adopted for turbulent simulation. The critical Reynolds Number for the transition from laminar to turbulent flow in corrugated tubes was found to be about 600 to 800. Numerical simulation results showed that the periodical wavy could enhance heat transfer of corrugated tube. The effect of the wavy heighi and distance on momentum and heat transfer was studied and performance of model parameters was evaluated. It was found that the enhancement of heat transfer in corrugated tube exist at high Reynolds number and the best wavy height was ε=-1.16.