Throttling Process

  1. dear all

    What is the throttling Process?
    what is Joule homson Effect?
     
  2. jcsd
  3. FredGarvin

    FredGarvin 5,087
    Science Advisor

  4. A throttling process is a process that is isenthalpic. Thus, [tex] h_1 = h_2 [/tex]. This means that the following is also true, [tex] u_1 + P_1 v_1 = u_2 + P_2 v_2 [/tex]. So if you drop pressure in a throttling value, you increase the internal energy, and vise versa.

    The Joule -thomson- effect deals with the fact that as you expand a gas it looses temperature. Note that for hydrogen; however, it gains temperaturee as it expands. This makes hyrdogen particularly dagnerous.
     
  5. Pressure drops in CNG kit Pressure regulator from 300 bar to 4 bar in 1st chamber due to expansion is it throttling process? temperature also drops in it.
     
  6. Yes, that is exactly what it is.

    Edit: wait, what do you mean by expansion? Is it going through a nozzle?
     
  7. no it is going throug valve (sloninoid valve) from storage cylinder through high pressure pipe into solinoid valve and then in the 1st stage chamber of pressure regulator.
     
  8. Yes, it is a throttling valve.
     
  9. what is the value of joule-thomson coefficient for methane
     
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