i got this exercise where : air is flowing through a well-lagged duct. at some point A the pressure is 1.5 bar and the temperature is 187 degrees C, and another point at a distance , B pressure is 1.3 bar , and temperature is 160 degrees . In which direction the air will flow?
My answer was from high to low pressure points . but the correct answer was from low to high? Is it the entropy ?
any explanation ?
Thanks in advance
Salim,
" but the correct answer was from low to high?"
I would question this.
The temperature is immaterial (pun? where?) - mass flow in a gas is purely a problem of identifying the pressure gradient.
(presuming that the pressures are the static pressure)
Hello salim,
I believe your question is incomplete. I will try to answer your question.
Fluid basically flows from "higher energy level" to a "lower energy level". And yes, fluid can flow from low pressure point to high pressure point . That is how pump lifts or pushes a fluid from low pressure region to a higher pressure region.
If a fluid is flowing from point A to point B; then we can surely say that the total energy at point A is more than the total energy at point B but we cant blindly conclude that the pressure at point A is more than point B.
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