# Reynolds number for flow over half cylinder?

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 April 23, 2009, 10:09 Reynolds number for flow over half cylinder? #1 New Member   Mohamed Haroon Join Date: Apr 2009 Posts: 4 Rep Power: 9 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 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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