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本文基于(火积)耗散极值原理得到了对流传热的优化场协同方程,用Fluent数值模拟求解层流状态下的管外流动换热的优化流场。得到了管外流动的优化速度场为多纵向涡结构形态,对优化流场进行分析,发现优化流场的综合换热效果远远高于原型流场。通过在管外添加扰流片的方法,来产生带有纵向涡的流场,达到优化管外流动传热的目的。数值模拟结果表明,添加扰流片在一定程度上可以强化管外对流换热。
In this paper, the optimal field synergistic equation for convective heat transfer is obtained based on the exergy dissipation principle. The optimal flow field for convective heat transfer outside the tube under laminar flow is solved by Fluent numerical simulation. The optimal velocity field of the flow outside the tube is obtained as a multi-longitudinal vortex structure, and the optimized flow field is analyzed. It is found that the comprehensive heat transfer effect of the optimized flow field is much higher than that of the prototype flow field. The flow field with longitudinal vortex is generated by adding spoiler outside the tube, so as to optimize the flow and heat transfer outside the tube. Numerical simulation results show that the addition of spoiler can enhance the convective heat transfer outside the tube to a certain extent.