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KP April 23, 2001 09:41

Friction coefficient
 
What is / Where can i find , the friction coefficient between Air and Aluminium (at -55 degrees celsius) ?

RichE April 23, 2001 10:54

Re: Friction coefficient
 
Reynolds number?

John C. Chien April 23, 2001 16:06

Re: Friction coefficient
 
(1). The book "boundary layer theory" by Schlichting has a formula: cf=0.074*(Re)^-0.2; 500000 .gt. (Re) .lt. 10000000., where Re is the Reynolds number based on the length. (2). At Re=10000000, cf=0.003 roughly. see the book for other numbers.


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