4 replies to this topic

[Light]

Why does the temperature of a gas decrease when it is expanded or throttled to a lower pressure? Is it true that hydrogen and helium show the reverse effect, i.e. they heat up when throttled? What is the reason for this distinguished behaviour as compared to other gases?

[USR]

I think what you are looking for is the joule-Thomson effect and the reverse joule Thomson effect of hydrogen respectively. 

[Art Montemayor]

USR is precisely correct.  Please refer to the following information and don't fail to make this subject a point to master for future engineering applications and examinations.  It is a vitally important chemical engineering thermodynamics' topic.

 

 Joule-Thomson Effect - Milton Beychok in Citizendium.docx   39.36KB   25 downloads

 On the Thermal Effects of Fluids in Motion - William Thomson + James P. Joule.pdf   1.65MB   22 downloads

[ankur2061]

samkha,

 

Refer the link below for some detailed explanation:

 

http://www.cheresour...in-an-expander/

 

Regards,

Ankur

[Light]

Thanks to all of you for your help.