Head loss function of velocity^2 or velocity^1?

November 19, 2007, 05:53

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.

November 19, 2007, 14:09

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

November 19, 2007, 05:53	Head loss function of velocity^2 or velocity^1?	#1
jrg Guest Posts: n/a	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.

November 19, 2007, 14:09	Re: Head loss function of velocity^2 or velocity^1	#2
Anton Lyaskin Guest Posts: n/a	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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