Flow over sphere low reynolds number

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 October 28, 2010, 19:30 Flow over sphere low reynolds number #1 New Member   Kadir Gökhan Güler Join Date: Oct 2010 Posts: 2 Rep Power: 0 Inlet velocity is 200e-6 m/s and diameter of sphere is 5e-6 m . I want to calculate the drag force acting on the sphere but when i compare it with the analythical solution which is 6*pi*eta*U*R the results are completely different . Please help???

 November 2, 2010, 09:06 #2 New Member   Anca Join Date: Aug 2009 Posts: 4 Rep Power: 16 Hy Kadir, Do you use the definition of the drag forces as the drag coefficient multiplied by 0.5*inlet_density*inlet_velocity^2*Impact_Surface? If you have a Sphere you must define the Impact_Surface as the area of the cercle: (Pi*Diameter^2 )/ 4 . Best regards, Anca

 November 2, 2010, 14:06 #3 New Member   Kadir Gökhan Güler Join Date: Oct 2010 Posts: 2 Rep Power: 0 Yes i know that formulation for sure however this flow is a micro flow which has a reynolds number of 0.001 in such reynolds number drag coefficient is not constant as a result in this case i cant use that formulation