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I used to have a spreadsheet for that, but I would have to search old disks for it. You can contact me through my site Eric_Kvaalen.com

If the water stays essentially in its own phase, then the hydrocarbon phases will act pretty much as though the water weren't there. So if the temperature is sufficiently high, the hydrocarbon phases will combine into one supercritical phase. (The minimum temperature for this to occur depends on...

First a comment to sshep--adiabatic does not mean constant enthalpy. If the gas does some work or accelerates, then its enthalpy decreases even if no heat is transferred out of the gas. (I think this is what hacksaw was saying.) Now some comments on the calculation of a series of orifices. When...

I agree that for adiabatic flow you get critical flow easily, without a long, narrow pipe. But achieving the isothermal case would be tricky. If you simply add the required heat before the orifice, then the temperature will increase in the part where you add the heat, but then as the gas goes...

I think you're talking about a situation in which the heat transfer between the gas and the environment is very high so that the temperature stays the same even as the gas accelerates to a high speed. This would require some combination of very narrow tubing and a slow decrease in diameter to...

CatBoy, you haven't told us how you made out with your analysis of this problem. Just wondering. http://Eric.Kvaalen.com

I agree that the temperature will go down a bit (perhaps even a lot in this case--I haven't done the calculation). In fact that's what I said in my post of March 27th. The speed of sound is of course a function of the temperature. But what matters for my argument is not the speed of sound in...

P.S. The fact that the temperature goes down somewhat as the velocity increases after each orifice does not change the validity of the argument. The speed of the gas if it gets to Mach 1 in an orifice is determined by the stagnation temperature, not by the actual temperature. And the stagnation...

It's true that I simplified a little. The truth is that if the gas has a high velocity in the pipe (I'm not talking about in the orifices), its temperature will be lowered a bit, and so the temperature at the end (where the velocity is highest) will be a bit lower than at the beginning. I...

You will not have choked flow in all three orifices. If any is choked, it will only be the last one (as EGT01 guessed would be the case). The temperature in the pipe will be constant (except in the vicinity of each orifice). This means that the speed of sound is the same for each section--in...

For any flow rate, you can calculate the pressure upstream from the third orifice, and then the pressure upstream from the second, and finally the pressure upstream from the first. (This is possible because for each orifice there is a relation between flow rate, downstream pressure, and upstream...