
#1
May506, 06:28 AM

P: 12

dear all
What is the throttling Process? what is Joule homson Effect? 



#2
May506, 06:50 AM

Sci Advisor
P: 5,095




#3
May506, 02:28 PM

P: 4,780

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. 



#4
May706, 11:36 PM

P: 12

Throttling Process
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.




#5
May706, 11:52 PM

P: 4,780

Yes, that is exactly what it is.
Edit: wait, what do you mean by expansion? Is it going through a nozzle? 



#6
May806, 01:51 AM

P: 12

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
May806, 10:59 PM

P: 12

what is the value of joulethomson coefficient for methane



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