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就一组不同水力直径的矩形微小直通道进行了实验研究,并通过经验证的数值方法进行了大量CFD计算,得到了通道内流体努塞尔数和阻力系数随雷诺数变化的规律.结果表明,在所研究微小尺度范围内通道内流动的转捩雷诺数提前到1 200~1 300之间,以大量数值模拟结果为样本点经过多元线形回归建立了所研究范围内微小通道流体换热与流动特性的准则关系式,并基于遗传算法,对矩形微小通道的几何结构进行了优化,为工程应用提供了依据.
A series of rectangular straight channels with different hydraulic diameters were studied experimentally, and a large number of CFD calculations were carried out by validated numerical methods. The regularities of the Nusselt number and the drag coefficient with the Reynolds number in the channel were obtained. , The Reynolds number of the transitional flow in the channel within the microscale range studied advanced to between 1 200 and 1 300, and the numerical simulation results for a large number of samples through multiple linear regression established the micro-channel fluid heat exchange and Flow characteristics of the relationship between the criteria, and based on genetic algorithms, the geometry of the rectangular micro-channel optimization, provided the basis for engineering applications.