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UDF at the wick/vapor interface

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Old   January 13, 2012, 02:40
Default UDF at the wick/vapor interface
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A.Brusly Solomon
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hello

I am trying to solve a heat trasfer problem. In that,I wanted to apply the boundary condition at the wick/vapor interface(considerd as flat boundry) as given in the attachment in eqn (5).can anybody help me in this regard?

Thanks in advance
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Old   January 21, 2012, 08:22
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Quote:
Originally Posted by brusly View Post
hello

I am trying to solve a heat trasfer problem. In that,I wanted to apply the boundary condition at the wick/vapor interface(considerd as flat boundry) as given in the attachment in eqn (5).can anybody help me in this regard?

Thanks in advance
Equation 5 appears to be wrong. The only transport process occurring at the interface will be:

Heat transfer from the air to the wick + enthalpy of vaporization = change in enthalpy of the wick

see the similar post here:

http://cape-forum.com/index.php/topic,7.0.html

That case, the wick is assumed to be spherical.
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Old   January 21, 2012, 10:51
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Mali28,

How does equation 5 differ from the heat transfer process you've described in your equation?

ComputerGuy

FYI: This problem has been tackled (assume this question is a copy/paste out of the article). Have a look at "Transport in Flat Heat Pipes at High Heat Fluxes From Multiple Discrete Sources" by Vadakkan, Garimella, and Murthy. Journal of Heat Transfer, June 2004, Vol 126.

Quote:
Originally Posted by mali28 View Post
Equation 5 appears to be wrong. The only transport process occurring at the interface will be:

Heat transfer from the air to the wick + enthalpy of vaporization = change in enthalpy of the wick

see the similar post here:

http://cape-forum.com/index.php/topic,7.0.html

That case, the wick is assumed to be spherical.
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Old   January 21, 2012, 12:07
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Quote:
Originally Posted by ComputerGuy View Post
Mali28,

How does equation 5 differ from the heat transfer process you've described in your equation?

ComputerGuy

FYI: This problem has been tackled (assume this question is a copy/paste out of the article). Have a look at "Transport in Flat Heat Pipes at High Heat Fluxes From Multiple Discrete Sources" by Vadakkan, Garimella, and Murthy. Journal of Heat Transfer, June 2004, Vol 126.

The first term in the equation is heat transfer by conduction. There is no conduction, the only heat transfer process from air to the wick is via convection process.
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