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搭建了微通道流动特性实验台,对直径为20μm和50μm的微石英管以及一种多孔光纤内的气体流动特性进行了研究。重点考察了不同流量下微通道进出口两端的压力降,进而计算获得在不同雷诺数下对应的流动摩擦因数以及泊肃叶数,并将实验与基于N-S方程的数值模拟结果进行对比分析。在实验研究的流量范围内,微通道内流动的克努森数部分进入滑移区,而毛细玻璃管和多孔光纤的摩擦因数呈现出比常规尺寸通道增大的现象。
A microchannel flow experiment platform was set up to study the gas flow characteristics of micro-quartz tubes with diameter of 20μm and 50μm and a porous optical fiber. The pressure drop at the inlet and outlet of the microchannel at different flow rates was investigated. The flow friction coefficient and Poiseuille leaf number corresponding to different Reynolds numbers were calculated and compared with the numerical simulation results based on the N-S equation. Within the experimentally studied flow range, the Knudsen number flowing in the microchannel enters the slip region and the friction factor of the capillary glass tube and the porous optical fiber shows an increase over the conventional size channel.