Gas flow over a micro cylinder is simulated using both a compressible Navier-Stokes solver and a hybrid continuum/particle approach. The micro cylinder flow has low Reynolds number because of the small length scale and the low speed, which also indicates that the rarefied gas effect exists in the flow. A cylinder having a diameter of 20 microns is simulated under several flow conditions where the Reynolds number ranges from 2 to 50 and the Mach number varies from 0.1 to 0.8. It is found that the low Reynolds number flow can be compressible even when the Mach number is less than 0.3, and the drag coefficient of the cylinder increases when the Reynolds number decreases. The compressible effect will increase the pressure drag coefficient although the friction coefficient remains nearly unchanged. The rarefied gas effect will reduce both the friction and pressure drag coefficients, and the vortex in the flow may be shrunk or even disappear.
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ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer
December 18–21, 2009
Shanghai, China
Conference Sponsors:
- Nanotechnology Institute
ISBN:
978-0-7918-4389-5
PROCEEDINGS PAPER
Simulation of Gas Flow Over a Micro Cylinder
Yuan Hu,
Yuan Hu
Chinese Academy of Sciences, Beijing; Huazhong University of Science and Technology, Wuhan, China
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Quanhua Sun,
Quanhua Sun
Chinese Academy of Sciences, Beijing, China
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Jing Fan
Jing Fan
Chinese Academy of Sciences, Beijing, China
Search for other works by this author on:
Yuan Hu
Chinese Academy of Sciences, Beijing; Huazhong University of Science and Technology, Wuhan, China
Quanhua Sun
Chinese Academy of Sciences, Beijing, China
Jing Fan
Chinese Academy of Sciences, Beijing, China
Paper No:
MNHMT2009-18288, pp. 119-127; 9 pages
Published Online:
October 26, 2010
Citation
Hu, Y, Sun, Q, & Fan, J. "Simulation of Gas Flow Over a Micro Cylinder." Proceedings of the ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer. ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer, Volume 1. Shanghai, China. December 18–21, 2009. pp. 119-127. ASME. https://doi.org/10.1115/MNHMT2009-18288
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