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November 20, 2013, 16:39 |
Diffuser: pressure drop or rise?
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#1 |
New Member
Join Date: Nov 2013
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Hello all,
there's a really basic question that has been bothering me for a few days now. Let's consider a diffuser, ie a conical portion of a duct for which the inlet area is smaller than the outlet area. Now, due to the Bernoulli equation and mass conservation, at the outlet I should have a lower velocity than at the inlet which in turn results in a higher pressure at the outlet so, along the pipe, my pressure is actually increasing. Now, looking at every hydraulics manual, it is stated that in such a pipe I should have a local pressure loss instead. Such a pressure drop is proportional to the massflow and to the area reduction. What's the wrong bit here? Am I missing something? Thanks for your help! Giovanni |
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