Rarefied Gas Flows in Rotating Helical Channels

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概要

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• Numerical and experimental investigations are performed for the rarefied gas flows in pumping channels of a helical-type drag pump. Modern turbomolecular pumps include a drag stage in the discharge side, operating roughly in the pressure range of 0.01〜10 Torr. The flow occurring in the pumping channel develops from the molecular transition to slip flow traveling downstream. Two different numerical methods are used in this analysis : the first one is continuum approach using the Navier-Stokes equations with slip boundary condition, and the second one is stochatic particle approach through the use of the direct simulation Monte Carlo (DSMC) method. The main difficulty in modeling three-dimensional flows in the rotating helical channels comes from the rotating frame of reference. In the present DSMC method, trajectories of particles are calculated by integrating a system of differential equations including the Coriolis and centrifugal forces.

• 一般社団法人日本機械学会の論文
• 2000-11-15

著者

• Hwang Young-kyu

  School Of Mechanical Engineering Sungkyunkwan University

• Kwon Myoung-keun

  School Of Mechanical Engineering Sungkyunkwan University

• Heo Joong-sik

  School Of Mechanical Engineering Sungkyunkwan University

• HEO Joong-Sik

  Postdoctoral Researcher

• KWON Myoung-Keun

  Graduate Research Assistant

関連論文

• Rarefied Gas Flows in Rotating Helical Channels
• F310 RAREFIED GAS FLOWS IN ROTATING HELICAL CHANNELS(Fluid machinary-2)
• H307 THE TEMPORAL AMPLIFICATION OF THE KARMAN BOUNDARY-LAYER(Heat transfer control)
• C312 A SIMILARITY SOLUTION OF THE MICROPOLAR BOUNDARY LAYER FLOW AND HEAT TRANSFER PAST A WEDGE(Natural convection application)
• G114 THE SPATIAL AMPLIFICATION OF DISTURBANCES IN VERTICAL NATURAL CONVECTION FLOWS OF WATER NEAR DENSITY EXTREMUM(Natural convection in enclosure-1)
• F103 EXPERIMENTAL STUDY ON THE HELICAL FLOW FIELD IN A CONCENTRIC ANNULUS WITH ROTATING INNER CYLINDER(Heat transfer in complex system-1)

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