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dhanramesh2002
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Join Date: Dec 2009
Posts: 6

Cylinder Pressurization and Temperature Rise

12/15/2009 10:59 AM

2 cylinders are available with me. Both are interconnected through hose and control valve.

First cylinder contains helium gas at 300bar at ambient temperature.

Second cylinder is empty.

Now I am pressurizing the second cylinder form the first cylinder by opening the valve at a charge rate of 2bar / minute. Now if I measure the 2nd cylinder wall temperature it reads more than the Helium gas temperature inside the 2nd cylinder.

How the 2nd cylinder wall reads more temperature?

Here I understand that the charging medium is (Helium gas). So 2nd cylinder wall temperature should be lesser than the inner Helium gas temperature. But it is not so. Why?

Pls explain the theory involved in this phenomena
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Anonymous Poster
#1

Re: Cylinder Pressurization and Temperature Rise

12/15/2009 11:13 AM

This is already answered in the other section. Don't repeat the same thread.
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PWSlack
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#2

Re: Cylinder Pressurization and Temperature Rise

12/15/2009 11:23 AM

There is a thread already running on this topic.

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standarded
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#3

Re: Cylinder Pressurization and Temperature Rise

12/15/2009 10:57 PM

As noted, this thread has already been started elsewhere. Posters are specifically asked not to submit the thread more than once.

Also, this appears to be a homework problem. Solving of homework problems are basically prohibited for the most part in these forums.

Please read the rules for posting in these forums.

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dhanramesh2002
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Join Date: Dec 2009
Posts: 6
#4
In reply to #3

Re: Cylinder Pressurization and Temperature Rise

12/16/2009 11:08 AM

Hello Sir,

This is not a homework problem. This is a 100% practical problem which is happening in the space science. If u know the answer pls explain.

I am the new member of this CR4. So I have not received any satisfied answer other than the "comments" received from you. That's why I have repeated the same question In more understandable way in the expectation of solution to my problem from elsewhere.
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Blink
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#5

Re: Cylinder Pressurization and Temperature Rise

12/16/2009 3:09 PM

The gas entering the second cylinder will be well below ambient temperature, from its very great expansion coming out of the first cylinder. So early in the process, the gas in the second cylinder will be below ambient. The gas entering the second cylinder will heat the second cylinder by fluid friction, warming the cylinder before the pressure in the second cylinder becomes great. Eventually, the compression of the gas in the second cylinder will warm the gas inside. Sound reasonable?

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