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Originally Posted by ConnClark
Lets see what nasa has to say on the subject (See attached). Oops, static pressure does change.
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Oops, indeed.
Read the title: "Inviscoid, Incompressible Fluid". An
incompressible fluid means water or some other liquid, not a compressible fluid like air. You picked an inappropriate diagram to support your position. Seems you and NASA are talking about different things.
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These equations are only valid for a closed system. This is your source of error. You cannot just discard the volumes in this equation with out making the assumption the volume on one side of the equation is identical to the volume of the other side of the equation.
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The equation is the Combined Gas Law, and it applies to ALL systems - closed, open and in between. No exceptions. The Gas Laws: They're the Law, not Suggestions.
As for ignoring the volume component: There are not two container volumes in this system, only one. It just happens to be a long, thin container where hot air is cooled as it passes through the container until it exits the other end. The values for V1 and V2 are therefore ignored.
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do you own an intercooler?
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Yes I do. It's attached to my car. What does that have to do with anything.
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With this assumption the density of the air would remain constant. This runs totally contrary to the purpose of an intercooler as an intercooler is used to increase intake charge density.
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With this one I am through. The IC cools the air. Cool air molecules have less energy therefore they exhibit less pressure and can be packed closer together. Cold air is more dense than hot air. This is basic, and is entirely consistent with the gas laws. This gets back to my very first statement that the pressure drop measured across the IC is due to the drop in temperature. I have shown that the drop is predicted by the Gas Laws, and that the Gas Law even predicts the amount of temperature drop correctly. The equation is simple enough for anyone to understand. I gave a reference. I gave a link to a calculator for anyone to use. Yet you still want to argue that the temperature drop isn't responsible for the pressure drop. Fine.
If for some reason you refuse to accept the proven fact that lowering the temperature also lowers the pressure, it is not my responsibility. Believe what you will. If you want to argue that the Gas Laws are wrong, go dig up Robert Boyle or Jacques Charles and argue with them.