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-   -   Reynolds number for flow over half cylinder? (http://www.cfd-online.com/Forums/main/63921-reynolds-number-flow-over-half-cylinder.html)

Haroon10 April 23, 2009 10:09

Reynolds number for flow over half cylinder?
 
Hello :)

i am considering air flow over half the circumference of a horizontal cylinder..which is fixed.similar to this diagram:

http://www.nurflugel.com/Nurflugel/H...y/Figure_1.gif

the air velocity is 6.67 m/s and length of rod is 200 mm with diameter 32 mm..is the formula Re = UD/v still applicable..or should i divide by two :confused:

i have another related question..

is there a way to directly calculate the thermal boundary layer thickness over this cylinder.

for laminar flow over a flat plate the thermal boundary layer thickness is
t=h * (Pr) ^ -0.333

h=5 * x * (Re)^ -0.5

h=hydrodynamic boundary layer thickness
Pr- prandtl number
Re-reynolds number
x-distance.

is there a way to have a similar formula for cylindrical co ordinates. i think it would require changing 'x' from cartesian to cylindrical co ordinates.but iv no idea how to go about it............

pls help.
much appreciated.


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