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Received: 2005-03-10

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Journal of Zhejiang University SCIENCE A 2005 Vol.6 No.9 P.1004~1006

http://doi.org/10.1631/jzus.2005.A1004


Equivalent thickness of materials of fused silica and stainless steel in the flow of microtubes


Author(s):  BAO Fu-bing, LIN Jian-zhong, SHI Xing

Affiliation(s):  Department of Mechanics, State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China; more

Corresponding email(s):   dingobao@zju.edu.cn, jzlin@sfp.zju.edu.cn

Key Words:  Microtubes, Flow, Fused silica, Stainless steel, Equivalent thickness


BAO Fu-bing, LIN Jian-zhong, SHI Xing. Equivalent thickness of materials of fused silica and stainless steel in the flow of microtubes[J]. Journal of Zhejiang University Science A, 2005, 6(9): 1004~1006.

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T1 - Equivalent thickness of materials of fused silica and stainless steel in the flow of microtubes
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A1 - LIN Jian-zhong
A1 - SHI Xing
J0 - Journal of Zhejiang University Science A
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DOI - 10.1631/jzus.2005.A1004


Abstract: 
The deviation of flow characteristics from the predictions of the conventional theory for microtubes was attributed to the change of fluid viscosity resulted from the interactions between the molecules on solid wall and in fluid. The degree of this departure is dependent on the microtubes materials. A concept of equivalent thickness with which conventional theory can be used to predict the flow in microtubes without modifying the fluid viscosity was put forward. The values of equivalent thickness for fused silica and stainless steel materials were determined as 1.8 μm and 1.5 μm, respectively, by repeated numerical simulation.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

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[2] Israelachvili, J.N., 1986. Measurement of the viscosity of liquids in very thin films. J. Colloid and Interface Science, 110(1):263-271.

[3] Li, J.M., Wang, B.X., Peng, X.F., 2000. ‘Wall-adjacent layer’ analysis for developed-flow laminar heat transfer of gases in microchannels. Int. J. Heat Mass Transfer, 43:839-847.

[4] Mala, G.M., Li, D.Q., 1999. Flow characteristics of water in microtubes. Int. J. Heat Fluid Flow, 20:142-148.

[5] Pfahler, J., Harley, J., Bau, H., Zemel, J., 1991. Gas and liquid flow in small channels. ASME DSC, 32:49-60.

[6] Qu, W.L., Mala, G.M., Li, D.Q., 2000. Pressure-driven water flows in trapezoidal silicon microchannels. Int. J. Heat Mass Transfer, 43:353-364.

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