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采用格子Boltzmann方法模拟了微通道在滑移区内不同Knudsen数下的微气体Poiseuille流,分析了微气体流动的速度分布以及流量与压降的关系,并给出了相对滑移长度和Poiseuille数随Knudsen数的变化特性。研究结果表明,微气体Poiseuille流的速度轮廓呈抛物线分布,但是边界速度大于0,出现速度滑移现象;随着Knudsen数的增加,微气体Poiseuille流的相对滑移长度也相应增加,摩擦阻力系数相应减小,微通道壁面对气体流动的影响逐渐减弱。
The lattice Boltzmann method was used to simulate the Poiseuille flow of microchannels with different Knudsen numbers in the slip zone. The velocity distribution of micro-gas flow and the relation between flow and pressure drop were analyzed. The relative slip length and Poiseuille number Variation with Knudsen number. The results show that the velocities of the Poiseuille flow are parabolic, but the velocity of the Poiseuille flow increases with the increase of the Knudsen number. The frictional drag coefficient Correspondingly, the effect of microchannel wall on gas flow is gradually weakened.