# very basic question regarding fluid mechanics

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 February 13, 2003, 06:51 very basic question regarding fluid mechanics #1 praveen Guest   Posts: n/a Hi guys, How can I find friction velocity if I know the bulk velocity. fluid is water. i am using a square duct configaration. i know only the bulk Reynolds number and fluid properties. please help me. praveen

 February 13, 2003, 11:15 Re: very basic question regarding fluid mechanics #2 Holidays Guest   Posts: n/a I seem to remember something of the form of Cmu^0.25 * sqrt (k) exists at a wall...

 February 13, 2003, 11:26 Re: very basic question regarding fluid mechanics #3 Praveen Guest   Posts: n/a friction velocity = sqrt( shear stress on wall/density ) You need to know the shear stress on the wall to calculate friction velocity.

 February 13, 2003, 11:53 Re: very basic question regarding fluid mechanics #4 ken Guest   Posts: n/a Is this a homework problem? Check out "A First Course in Turbulence" (Tennekes & Lumley) Chapter 5.2

 February 14, 2003, 04:19 Re: very basic question regarding fluid mechanics #5 Holidays Guest   Posts: n/a Praveen, Thank you, but I believe I knew that. However the formula I gave you is used in CFD at the walls I believe. You could check T&L as Ken adviced.

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