Pipe Reducer Head Loss Equation
Pipe Reducer Head Loss Equation
(OP)
Hi All:
Can someone help me find the reference/source of this equation? It's for calculating the head loss through a reducer. It was posted by BigInch in 2006.
Hf_Temp = (1 / CC - 1) ^ 2 * V2 ^ 2 / (2 * g_SI)
where
CC = 0.582 + 0.418 / (1 - D2 / D1)
It seems to work, but I need the reference before I can confidently use it in my calculations.
Thanks
Can someone help me find the reference/source of this equation? It's for calculating the head loss through a reducer. It was posted by BigInch in 2006.
Hf_Temp = (1 / CC - 1) ^ 2 * V2 ^ 2 / (2 * g_SI)
where
CC = 0.582 + 0.418 / (1 - D2 / D1)
It seems to work, but I need the reference before I can confidently use it in my calculations.
Thanks





RE: Pipe Reducer Head Loss Equation
Real world knowledge doesn't fall out of the sky on a parachute, but rather is gained in small increments during moments of panic or curiosity.
RE: Pipe Reducer Head Loss Equation
Any other ideas?
It was interesting though that this equation does not consider the quickness of the reduction/enlargement; i.e. the included angle. I know that in general, pipes have consistent reduction/expansion rates, but having the full story would be great as a teaching tool too.
Thanks
RE: Pipe Reducer Head Loss Equation
Hooper's equation is K1 = [0.1 + 50/Re1][ (D1/D2)4 - 1]
where subscript 1 is for upstream and 2 for downstream.
Hooper implies that provided the corners of the reducer are well rounded the length is unimportant. Hooper pointed out that very little published data was available at the time. The data (published after Hooper's article) I referenced in thread378-307284: (Design) formulae for reducers - contraction angles etc. indicates that Hooper's numbers may be a little bit optimistic, but there is a large spread in the available data so it is hard to say who is accurate.
Crane, and basically every other book that talks about reducers, gives data for straight sided conical reducers which I have seen only very rarely out in the field. It seems that conical reducers are only used by instrument engineers when installing a control valve smaller than the line size and where they want a minimum of pressure drop in the reducers. But I suspect it is more for historical reasons than good engineering. (Ducks and runs for cover as control engineers attack)
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RE: Pipe Reducer Head Loss Equation
Piping Design Handbook
McKetta & Dekker 1992
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RE: Pipe Reducer Head Loss Equation
RE: Pipe Reducer Head Loss Equation