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Flow over sphere low reynolds number

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Old   October 28, 2010, 19:30
Default Flow over sphere low reynolds number
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Kadir Gökhan Güler
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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???
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Old   November 2, 2010, 10:06
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Anca
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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 .

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Old   November 2, 2010, 15:06
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Kadir Gökhan Güler
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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
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