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Reynolds number for flow over half cylinder?

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Old   April 23, 2009, 10:09
Smile Reynolds number for flow over half cylinder?
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Mohamed Haroon
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i am considering air flow over half the circumference of a horizontal cylinder..which is fixed.similar to this diagram:

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

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

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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