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-----Original Message----- From: Steve Lindblom <s_lindblom@co*.co*> To: techdiver@aquanaut.com <techdiver@aquanaut.com> Date: 13 June 1999 19:34 Subject: Re: Advise on PP blending >Interesting how divergent and contradictory the replies to this have been. >I think this brings out an important point, that adiabatic compression is >not totally predictable or very well understood, and least not on the level >most of us are dealing with it, and it is very hard to say for sure what is >safe and what isn't, which is why entities like Global try to reduce it >into simple rules, which can often be less than totally accurate. > >Adiabatic heating is caused when a surge of expanding gas comes to an >abrupt stop, which causes it to recompress and hence heat up. The problem >with a long run is is allows a pressure surge to accelerate and build >momentum, just the way the longer barrel of a rifle allows a bullet to >reach higher velocities. The higher the velocity, the greater the adiabatic >heating when it hits a dead end/restriction. Hmmm, this has got me thinking so bear with me as my remaining brain cell is running at max chat! If you have a 30ft tube closed at one end and rapidly introduce ,say, 200bar O2 to the other end the tube will take a second or two to pressurise and will get hot. Now do the same with a 3inch tube and it will pressurise to 200bar in an instant and the gas inside will get *very* hot. Just a thought kevin -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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