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Metals 2015, 5(1), 336-349; doi:10.3390/met5010336

Measurement and Determination of Friction Characteristic of Air Flow through Porous Media

1
School of Mechanical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
2
Wuxi Pneumatic Technology Research Institute, Wuxi 214072, China
3
State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China
4
Precision and Intelligence Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan
*
Author to whom correspondence should be addressed.
Academic Editors: Jordi Sort and Eva Pellicer
Received: 8 January 2015 / Revised: 10 February 2015 / Accepted: 2 March 2015 / Published: 9 March 2015
(This article belongs to the Special Issue Nanoporous Metallic Alloys)
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Abstract

Sintered metal porous media currently plays an important role in air bearing systems. When flowing through porous media, the flow properties are generally represented by incompressible Darcy-Forchheimer regime or Ergun regime. In this study, a modified Ergun equation, which includes air compressibility effects, is developed to describe friction characteristic. Experimental and theoretical investigations on friction characteristic are conducted with a series of metal-sintered porous media. Re = 10 is selected as the boundary for a viscous drag region and a form drag region. Experimental data are first used to determine the coefficient α in the viscous drag region, and then the coefficient β in the form drag region, rather than both simultaneously. Also, the theoretical mass flow rate in terms of the modified Ergun equation provides close approximations to the experimental data. Finally, it is also known that both the air compressibility and inertial effects can obviously enhance the pressure drop. View Full-Text
Keywords: porous media; friction characteristic; modified Ergun; air flow; compressibility porous media; friction characteristic; modified Ergun; air flow; compressibility
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zhong, W.; Li, X.; Tao, G.; Kagawa, T. Measurement and Determination of Friction Characteristic of Air Flow through Porous Media. Metals 2015, 5, 336-349.

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