## Reynolds Number

Hello, I am trying to obtain how to find the Reynolds Number of a circular plate perpendicular to external flow. Thanks
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 Recognitions: Science Advisor The definition of the Reynolds number is here: http://en.wikipedia.org/wiki/Reynolds_number#Definition Use the diameter of the plate as a length scale.
 Recognitions: Homework Help The problem is what is the "length" of a flat perpendicular plate?

## Reynolds Number

The diameter of the cylinder is 3 inches. The length of the tube is approximately 3 feet. The set of equations that I am using say that there is an equation for a flat plate in a external perpendicular flow. I have found equations for flat plates with the external flow parallel to the plate's length as represented in the wiki-site and different school notes. However, I have yet to obtain an equation for a flat plate with a flow perpendicular to the diameter.
The problem is diagrammed below... (This flow is not a pipe. Completely filled volume)
Flow:
--> ______________ __
--> /\ ....................\ |
--> | |.................... | Diameter
--> \/_____________/ _|_
-->
.......|-----Length----|