Author: Li Z-X.

Source: Microscale Thermophysical Engineering, Volume 7, Number 3, July/August/September 2003 , pp. 253-265(13)

Publisher: Taylor and Francis Ltd

Abstract:

Glass, silicon, and stainless steel microtubes with diameters of 79.9-166.3 m, 100.25-205.3 m, and 128.76-179.8 m, respectively, were employed to study the characteristics of frictional resistance for deionized water flow in microtubes. Glass and silicon microtubes can be treated as smooth ones, whereas stainless steel microtubes with 3%-4% relative roughness has to be treated as coarse ones. It can be concluded from experimental results that for fully-developed water flow in smooth glass and silicon microtubes, the product of Darcy friction factor f and Reynolds number Re remains approximately 64, which is consistent with the results in macrotubes. While the value of f · Re for water flow in rough stainless steel microtubes is 15%-37% higher than 64, it is distinctly different from the conventional conclusion that relative roughness below 5% has no effect on the flow resistance for incompressible fluid flow in macrotubes.

Keywords: microtubes; roughness; incompressible fluid flow; frictional resistance

Document Type: Research article

Affiliations: 1: Department of Engineering Mechanics, Tsinghua University, Beijing, China

Publication date: 2003-07-01

More about this publication?

• Subscribe to this Title
• ingentaconnect is not responsible for the content or availability of external websites

Related content

• In this: publication
• By this: publisher
• In this Subject: General & Civil Engineering
• By this author: Li Z-X.

Website © Publishing Technology. Article copyright remains with the publisher, society or author(s) as specified within the article.

• Terms and conditions
• Privacy policy
• Information for advertisers