Investigation of Wall Effects on Flow Characteristics of a High Knudsen Number Nozzle

被引：3
作者：
Watvisave, D. S. [1 ]
Bhandarkar, U. V. [1 ]
Puranik, B. P. [1 ]
机构：
[1] Indian Inst Technol, Dept Mech Engn, Bombay 400076, Maharashtra, India
来源：
NANOSCALE AND MICROSCALE THERMOPHYSICAL ENGINEERING | 2013年 / 17卷 / 02期
关键词：
micronozzle; rarefied flows; accommodation coefficients; wall effects; GAS-FLOWS; NUMERICAL-SIMULATION; TANGENTIAL MOMENTUM; ACCOMMODATION; PERFORMANCE; EXTENSIONS;
D O I：
10.1080/15567265.2012.760694
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Two-dimensional direct simulation Monte Carlo (DSMC) was used to investigate the effect of wall accommodation on different modes of operation of a nozzle under high Knudsen number conditions. Substantial performance enhancement was seen at higher values of convergingdiverging angles, because a reduction in the surface area-to-volume ratio decreased the wall effects. Though the normal energy accommodation had a negligible influence on the nozzle performance, it was seen to be a critical factor for accurate prediction of gas temperature along the wall. At higher Knudsen numbers, the flow tended to become one-dimensional even for the case of complete accommodation.
引用
收藏
页码：124 / 140
页数：17
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