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-   -   Head loss function of velocity^2 or velocity^1? (http://www.cfd-online.com/Forums/main/14398-head-loss-function-velocity-2-velocity-1-a.html)

jrg November 19, 2007 05:53

Head loss function of velocity^2 or velocity^1?
 
Is head loss due to flow expansion/contraction a function of velocity or velocity^2 under laminar conditions?

i.e., in the Bernoulli's eqn, should one write Kv^2/2g or Kv/2g? I know that the K for a long pipe is proportional to 1/Re leading to a dependence only on v. But I'm not sure about minor losses.

Anton Lyaskin November 19, 2007 14:09

Re: Head loss function of velocity^2 or velocity^1
 
You should always use K*V^2/2g. However for low Re K can be a function of Re. For expansion/contraction it is so complicated that I will not post it here, because I can mistype :)


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