Throttling Process & Joule Thomson Effect

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In summary, the conversation discusses the throttling process and the Joule-Thomson effect. The throttling process is an isenthalpic process, where the internal energy and pressure of a gas are related. The Joule-Thomson effect explains the temperature changes that occur when a gas expands. It is noted that hydrogen behaves differently from other gases in this process. The conversation then delves into a specific example involving a CNG kit and a pressure regulator, confirming that it is indeed a throttling process. The value of the Joule-Thomson coefficient for methane is not explicitly mentioned in the conversation.
  • #1
ahmad.hasan
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dear all

What is the throttling Process?
what is Joule homson Effect?
 
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  • #3
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
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
Yes, that is exactly what it is.

Edit: wait, what do you mean by expansion? Is it going through a nozzle?
 
  • #6
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.
 
  • #7
Yes, it is a throttling valve.
 
  • #8
what is the value of joule-thomson coefficient for methane
 

FAQ: Throttling Process & Joule Thomson Effect

What is the throttling process?

The throttling process, also known as the Joule-Thomson process, is a thermodynamic process in which a gas undergoes a rapid expansion through a valve or porous plug. This expansion results in a decrease in temperature and pressure of the gas.

What is the Joule-Thomson effect?

The Joule-Thomson effect is the phenomenon observed during the throttling process, where a gas experiences a decrease in temperature and pressure without any external work being done on it. This effect is a result of the gas molecules losing some of their kinetic energy during the expansion process.

What is the difference between throttling and adiabatic expansion?

Throttling and adiabatic expansion are both processes in which a gas expands and experiences a decrease in temperature and pressure. However, in throttling, the process is not reversible and there is a small temperature change due to the Joule-Thomson effect. In adiabatic expansion, the process is reversible and there is no change in temperature.

How is the Joule-Thomson coefficient related to the throttling process?

The Joule-Thomson coefficient is a measure of the change in temperature of a gas during the throttling process. It is defined as the change in temperature per unit change in pressure at constant enthalpy. The throttling process is directly related to the Joule-Thomson coefficient as it is the process that causes the temperature change.

What are the applications of the throttling process and Joule-Thomson effect?

The throttling process and Joule-Thomson effect have various practical applications, including in refrigeration and liquefaction processes. They are also used in natural gas production, where the expansion of gases through pipelines can cause a decrease in temperature and the separation of different components. Additionally, the Joule-Thomson effect is utilized in gas flow meters and pressure regulators.

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