Heo Joong-Sik, Hwang Young-Kyu
Fluid Machinery Assessment Team, Korea Machinery-Meter and Petrochemical Testing and Research Institute, 587-10 Sinsa-dong, Gangnam-gu, Seoul 135-891, Korea.
J Nanosci Nanotechnol. 2009 Dec;9(12):7412-5. doi: 10.1166/jnn.2009.1791.
Thermal transpiration flows in nano-pore aero-gel membranes are investigated for the performance optimization of a Knudsen compressor. Critical elements that drive the Knudsen compressor are its thermal transpiration membranes. The membranes are based on aerogel, or on machined aerogel. In our study, aerogel is modeled as a single microflow channel. The effects of wall temperature distribution on thermal transpiration flow patterns are examined. The flow has a pumping effect, and the mass flow rates through the channel are calculated. The results show that a steady one-way flow is induced for a wide range of Knudsen numbers. The direct simulation Monte Carlo (DSMC) method, with a variable hard sphere (VHS) model and no time counter (NTC) technique, is applied to obtain numerical solutions.
为优化克努森压缩机的性能，对纳米孔气凝胶膜中的热输运流展开了研究。驱动克努森压缩机的关键部件是其热输运膜。这些膜基于气凝胶或加工气凝胶。在我们的研究中，气凝胶被建模为单个微流通道。研究了壁面温度分布对热输运流型的影响。该流具有泵送效应，并计算了通过通道的质量流率。结果表明，在很宽的克努森数范围内会诱导出稳定的单向流。采用具有可变硬球（VHS）模型和无时标（NTC）技术的直接模拟蒙特卡罗（DSMC）方法来获得数值解。
