Recent content by Andrew U

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    Graduate Reversible vs irreversible work for adiabatic process

    Clarification: When I ask about the increase in temperature, I am referring to an additional increase that is larger than one would normally expect for an adiabatic compression, thus leading to a larger final volume.
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    Graduate Reversible vs irreversible work for adiabatic process

    Hi Chet, thanks! I invented this one (and obviously missed an important point). So if I end up at a larger volume, then my temperature must also be higher, correct? Is this because of friction during the irreversible compression?
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    Graduate Reversible vs irreversible work for adiabatic process

    I have a gas transitioning adiabatically between A (P1, V1) and B (P2, V2) where P1>P2 and V2>V1. The question is to determine the net work done on the gas if the gas is first expanded reversibly from A to B (w = dE = Cv(T2-T1)), and then compressed irreversibly from B to A (w = -Pext(V1-V2)) at...
    • Andrew U
    • Thread
    • Adiabatic Adiabatic process Irreversible Process Reversible Work
    • Replies: 5
    • Forum: Mechanics
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    Graduate Why define entropy with heat instead of work?

    From what I understand, in the Carnot cycle summing qi/Ti for each step results in zero, thus indicating a new state function, entropy = qrev/T. But since dE = 0 = q+w, then q = -w, and looking at the equations derived from the cycle summing wi/Ti for each step should also result in zero. So why...