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

Metals

Wei Zhong¹  Xin Li³  Guoliang Tao³  Toshiharu Kagawa²  Jordi Sort⁴ 

[1] School of Mechanical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China;Precision and Intelligence Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan; E-Mail:;State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China; E-Mails:;id="af1-metals-05-00336">1School of Mechanical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Chi

关键词: porous media;    friction characteristic;    modified Ergun;    air flow;    compressibility;   

DOI  :  10.3390/met5010336

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.