【摘要】 采用数值模拟的方法研究了缝隙宽度为2 mm的窄缝流道壁面上分布的微小凹坑对流道内的流动与传热的影响情况.采用RNG K-ε方程模型作为湍流计算模型,应用Stmplo算法求解压力-速度耦合项,模型的可行性用Burgess的实验数据检验.数值研究结果表明,在给定凹坑分布的条件下,表面凹坑的几何结构对窄缝流道内的流动传热性在一定雷诺数范围内有显著的影响;在较低雷诺数条件下,随雷诺数的增加窄缝凹坑流道的传热能力将增加,当雷诺数大于某临界点时,表面凹坑对传热能力的影响不大.更多还原

【Abstract】 This authors uses a physical model of the rectangular channel with dimpled surface to simulate the flow and heat transfer situation.On the basis of actual flow and heat transfer in the channel,it made the interrelated hypothesizes and built up the math model.They adopted the turbulent model,appliy the algorithm to resolve the pressure-velocity coupling and use the experimental data model to check up the feasibility of the model.By the study,the thesis shows the principle of the flow and heat transfer in narrow channel with a dimple surface and gets the factors and the conditions that affect the flow and heat transfer.The results show that the geometry structure and rank distributing of dimple affect the capability of heat transfer evidently.When Reynolds number is low,the capability of heat transfer becomes better as the number increases,and when Reynolds number is bigger than a critical point,there is a little influence.更多还原