Question about momentum thickness Reynolds number

Anna Tian · March 3, 2013, 06:06

Hi,

How is 'momentum thickness Reynolds number' defined?

For pipe, diameter is always used to compute the Reynolds number.

But 'momentum thickness Reynolds number' is computed by the momentum thickness.

So shall I suppose the 'momentum thickness Reynolds number' of a pipe is much smaller than the pipe Reynolds number computed by the diameter?

Why the 'transition onset Reynolds number' is always expressed by the 'momentum thickness Reynolds number'? How is 'momentum thickness Reynolds number' directly related to the flow regime transition?

Thanks!

venkateshaero · March 4, 2013, 11:32

check this website.Are u doing doing any boundary layer studies?
http://www.texstan.com/ef1.php

venkateshaero · March 4, 2013, 11:45

http://citeseerx.ist.psu.edu/viewdoc...=rep1&type=pdf

March 3, 2013, 06:06	Question about momentum thickness Reynolds number	#1
Anna Tian Senior Member Meimei Wang Join Date: Jul 2012 Posts: 494 Rep Power: 16	Hi, How is 'momentum thickness Reynolds number' defined? For pipe, diameter is always used to compute the Reynolds number. But 'momentum thickness Reynolds number' is computed by the momentum thickness. So shall I suppose the 'momentum thickness Reynolds number' of a pipe is much smaller than the pipe Reynolds number computed by the diameter? Why the 'transition onset Reynolds number' is always expressed by the 'momentum thickness Reynolds number'? How is 'momentum thickness Reynolds number' directly related to the flow regime transition? Thanks! __________________ Best regards, Meimei

March 4, 2013, 11:32		#2
venkateshaero Member venki Join Date: May 2011 Posts: 84 Rep Power: 15	check this website.Are u doing doing any boundary layer studies? http://www.texstan.com/ef1.php davcrisp likes this.

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March 4, 2013, 11:45		#3
venkateshaero Member venki Join Date: May 2011 Posts: 84 Rep Power: 15	http://citeseerx.ist.psu.edu/viewdoc...=rep1&type=pdf