English Deutsch Français Italiano Español Português 繁體中文 Bahasa Indonesia Tiếng Việt ภาษาไทย
All categories

I have a blower going to a 4"d hose then it splits into two 4"d hoses. Will the system maintain equal pressure or will the pressure be cut in two at the split? Make any necessary assumptions.

2007-10-05 07:39:58 · 2 answers · asked by Brian 2 in Science & Mathematics Engineering

2 answers

In an air duct system there are two pressures that determine the pressure at any particular point. The pressures are static pressure, and velocity pressure.
http://www.grc.nasa.gov/WWW/K-12/airplane/pitot.html
The difference between these two is velocity pressure and with the density of the gas can tell you flow.
But your question was about pressure. So we look at the relationship Flow= Velocity pressure time the area or cfm=v*A
If you add a 'Y' pipe to the system you increases the area of the system by 2 (if the Y-pipe is the same diameter) so the area in the above system becomes twice as large.
That means that either flow, or velocity must change to make the equation true again. (or both)
Bernoulli proved that velocity is a victim of area. If the supply doesn't change, then the velocity must. But since it is directly proportionate to flow, so must the flow.
The key is the two pressures that make up the total. The velocity pressure will reduce, but the static pressure will remain about the same(if you neglect the friction in the fitting) and according to the above equation the flow will halve.
I hope that helped but it is the shortest version I could come up with here.

2007-10-05 08:44:11 · answer #1 · answered by mavis b 4 · 0 0

Depends on the flow, only at no flow will the pressure be equal in both branches.

2007-10-05 15:21:20 · answer #2 · answered by jimmymae2000 7 · 0 0

fedest.com, questions and answers