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equivalent diameter vs hydraulic diameter

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Old   April 5, 2010, 07:53
Default equivalent diameter vs hydraulic diameter
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hi friends,
i stuck up with one problem. i am working on flow over 2D triangular cylindrical obstacle in a channel. i am planning to compare my results ie drag coefficient, wake length etc., with square obstacle. my question is on what basis i have to compare these two either by equivalent diameter or hydraulic diameter?
also what is the difference between these two diameters?
please reply me...
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Old   April 5, 2010, 10:01
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This is not a comprehensive answer, but I have only seen the hydraulic diameter applied to internal flows, whereas the equivalent diameter is used for representing objects submerged in an external flow.
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