equivalent diameter vs hydraulic diameter

swamysrikanth · April 5, 2010, 07:53

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...

agd · April 5, 2010, 10:01

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.

April 5, 2010, 07:53	equivalent diameter vs hydraulic diameter	#1
swamysrikanth New Member srikanth Join Date: Nov 2009 Posts: 22 Rep Power: 17	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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April 5, 2010, 10:01		#2
agd Senior Member Join Date: Jul 2009 Posts: 358 Rep Power: 19	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.