Entrance loss from open channel to pipe

AI Thread Summary
The entrance loss from an open channel to a pipe is expressed by the equation hloss = K*(V2^2 - V1^2)/2g, where V1 is the velocity in the channel and V2 is the velocity in the pipe. The discussion highlights a common confusion regarding the inclusion of the channel flow velocity (V1) in the equation, as traditional formulas often simplify this to K*(V^2)/2g, assuming V1 is negligible. It is suggested that if V1 is assumed to be zero, the equation simplifies to the more familiar form. Understanding the derivation of this equation is crucial for accurately calculating entrance losses in fluid dynamics. Clarifying these assumptions can help in applying the formula correctly in practical scenarios.
miriza
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Hi!

I have the following equation for the entrance loss from an open channel to a pipe, but I'm not sure how it was derived:

hloss = K*(V2^2 - V1^2)/2g

I have always seen entrance losses as: K*(V^2)/2g, but why is the channel flow velocity considered in the equation above.

Thanks, Michelle
 
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I think it is because the velocity in the open channel (V1) is assumed to be zero, but I am not 100% sure.
 

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