微通道氣體流動與熱傳之蒙地卡羅直接模擬

DSMC of Gaseous Flow and Head Transfer in Microchannel

曾培元(P. Y. Tzeng) ； 羅仲禹(C. Y. Lo) ； 陳炳炫(P. H. Chen)

《中國航空太空學會學刊》 34卷4期 (2002/12) Pp. 363-370

https://doi.org/10.6124/TAASRC.200212_34(4).09

摘要

本文使用直接模擬蒙地卡羅法(DSMC)模擬微通道內稀薄氣體之流動，透過流動邊界的設定來達到壓力梯度驅動的目的，並藉著入口及出口壓力的調整來改變流場之相對稀薄度即Knudsen數(Kn)，模擬的流區由滑動流區至過渡流區，藉此以瞭解稀薄效應對壓力、溫度及速度等流動性質的影響。同時考慮明顯的熱傳效應如冷流熱壁之問題對微通道內氣體流動性質變化所造成之影響亦作一探討，模擬的結果顯示相關流動性質在流向上的變化趨勢大致與Fanno/Rayleigh之流動理論吻合。

關鍵字

直接模擬蒙地卡羅法DSMC ； 微通道 ； Knudsen數 ； Poiseuille流

並列摘要

Pressure-driven gaseous flows in micro-channel via stream boundary setting are performed by using Direct Simulation Monte-Carlo (DSMC). The rarefaction parameter Kn (Knudsen number) of the flow field is changed by varying inlet/exit pressure for a range of slip to transition regime flows. Both ambient and hot wall temperature cases are investigated in order to realize the flow properties variation influenced by pronounced heat transfer. It is found that the flow property distributions such as temperature, density and pressure in the streamwise direction show the similar trends as the Fanno/Rayleigh flow.

並列關鍵字

DSMC ； Microchannel Poiseuille flow ； Kundsen Number Kn