The molecular dynamics method was used to calculate the alternating oscillating flow in the micro-channel pulse tube. A thermodynamics corresponding process of the pulse tube coupled with an active piston was simulated. The simulation results show that the pressure amplitude at middle of tube was smaller than the two ends of the tube, but the main temperature gradient was distributed among them and the temperature at cold end further decreased with the motion of active piston at hot end. The optimal field distribution was obtained when the displacement phase angle for the compression piston and the active piston was 108°.

中文翻译：

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非平衡分子动力学模拟主动活塞耦合微通道脉冲管中的交替振荡流

分子动力学方法用于计算微通道脉冲管中的交替振荡流。模拟了与主动活塞耦合的脉冲管的热力学对应过程。仿真结果表明，管中部的压力幅值小于管的两端，但主要温度梯度分布在管的两端，随着主动活塞在热端的运动，冷端的温度进一步降低。当压缩活塞和主动活塞的位移相角为108°时，可获得最佳场分布。