Quote:
Originally Posted by aerohead
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* Momentum does not appear in the index of the book.It is mentioned in remarks about body camber.
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* Inertia is only mentioned tangentially in Chap.13,dealing with CFD codes and the Euler equations,Navier-Stokes equations,Equation of continuity,Mach number/Reynolds number,Bernouli Theorem,and Laplace-Potential Equation
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Hi Aerohead,
Your point above is well taken, I really did understand what you were initially trying to say, but I did have to at least make a comment about the mass of the air molecules.
Another example that shows just how significant that mass can be is taking a look at the ordinary air nozzle, you know, the one used to dust off metal parts after machining them?
The compressed air nozzle is very effective at directing a blast of air at the object which needs the chips blown off for whatever reason.
If the air mass were *not* an issue and was strictly dictated by pressure alone, the blast of air would not jet out from the nozzle, but propagate out in a hemispherical pattern in all directions from the nozzle. In this case, pointing a nozzle at an object to be cleaned would have only a slight effect on it, and in fact blow just as much air toward the user as away from them as well.
But the fact that this does not happen means that mass is a larger effect than directed in the previous post.
Jim.