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采用Delaunay三角化方法对计算区域进行网格划分,开发了适合于非结构化网格的蒙特卡洛直接模拟程序,并对程序的正确性进行了验证.在此基础上模拟分析了粗糙元为三角形的平行平板间微通道内稀薄气体的二维流动与换热.通道进出口压力固定,上下平板温度恒定.计算分析了粗糙元高度、宽度以及分布密度的影响.结果表明:微通道内粗糙元对流动与换热有明显的扰动;随着粗糙元的变大,速度跳跃显著,甚至出现漩涡,增加了通道内的压力损失;但粗糙元增强了微通道壁面与气体之间的换热.
The Delaunay triangulation method is used to mesh the calculation area, a Monte Carlo direct simulation program suitable for unstructured grid is developed, and the correctness of the program is verified. On the basis of this, Dimensional flow and heat transfer of the lean gas in the microchannels between the triangular parallel plates.The pressure of the inlet and outlet of the channels is fixed and the temperature of the upper and lower plates is constant.The influence of the height, width and distribution density of the roughness elements is calculated and analyzed.The results show that the roughness As the roughness increases, the velocity jumps significantly, even vortexes increase the pressure loss in the channel. However, the roughness element enhances the heat exchange between the microchannel wall and the gas .