This paper presents two sets of analytical exact solutions for collisionless gas flows from a planar exit, impinging at an inclined flat plate. These analytical results are obtained by using gaskinetic theories. The first set of solutions are for a diffuse reflective plate surface, and the other set of solutions are for a specular reflective plate surface. A virtual nozzle exit is adopted to aid analyzing the specular reflective plate scenario. New formulas for plate surface properties, including velocity slips, pressure, shear stress, and heat flux distributions, are provided. For both problems, the flowfield exact solutions are investigated as well. Numerical simulations with the direct simulation Monte Carlo method are performed to validate these new analytical results, and good agreement is obtained for flows with high Knudsen numbers. The results consider effects from many factors, such as the plate inclination angle, geometry ratios, and exit gas and plate properties (such as exit gas bulk density, gas speed ratio, and exit gas and plate temperatures). Compared with past work, these new solutions are more comprehensive and practical. The results also illustrate that if the plate is quite close to the nozzle exit, it is improper to adopt the traditional treatments of a point source and a simple cosine function.
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Research Article|
May 05 2016
Detailed flowfield and surface properties for high Knudsen number planar jet impingement at an inclined flat plate
Chunpei Cai;
Chunpei Cai
a)
Department of Mechanical Engineering and Engineering Mechanics,
Michigan Technological University
, Houghton, Michigan 49903, USA
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Xin He
Xin He
Department of Mechanical Engineering and Engineering Mechanics,
Michigan Technological University
, Houghton, Michigan 49903, USA
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a)
Electronic address: [email protected]
Physics of Fluids 28, 056103 (2016)
Article history
Received:
January 14 2016
Accepted:
April 17 2016
Citation
Chunpei Cai, Xin He; Detailed flowfield and surface properties for high Knudsen number planar jet impingement at an inclined flat plate. Physics of Fluids 1 May 2016; 28 (5): 056103. https://doi.org/10.1063/1.4948365
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