Reynolds number

pranab_jha · July 15, 2011, 10:18

Is the "Cell Reynold's number" same as actual Reynolds number (say in case of a pipe, based of pipe diameter). Which value should be used to determine if the flow is laminar or turbulent?

Amir · July 15, 2011, 11:20

Quote:

Originally Posted by pranab_jha

Is the "Cell Reynold's number" same as actual Reynolds number (say in case of a pipe, based of pipe diameter). Which value should be used to determine if the flow is laminar or turbulent?

Not at all, the length scale is different; in addition, the velocity of each cell is considered as velocity scale.
Cell Reynold's number is used for some numeric algorithms. (peclet No. )

A.D.E · July 20, 2011, 10:59

The cell Reynolds number is based on the local characteristics and in not the same as the flow Re!

July 15, 2011, 10:18	Reynolds number	#1
pranab_jha Member Pranab N Jha Join Date: Nov 2009 Location: Houston, TX Posts: 86 Rep Power: 16	Is the "Cell Reynold's number" same as actual Reynolds number (say in case of a pipe, based of pipe diameter). Which value should be used to determine if the flow is laminar or turbulent?

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July 20, 2011, 10:59		#3
A.D.E Member Join Date: Jul 2011 Posts: 42 Rep Power: 14	The cell Reynolds number is based on the local characteristics and in not the same as the flow Re!