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-   -   Simulate heat transfer of heat sink in a box... (http://www.cfd-online.com/Forums/cfx/69846-simulate-heat-transfer-heat-sink-box.html)

chien87 November 6, 2009 11:21

Simulate heat transfer of heat sink in a box...
 
Hi all CFD EXPERTS,
I am newbie for cfd, currently using ansys11.0, my situation is there is a box with 2 inlets (side) for air flow in and 1 inlet for air flow out (top), the heat sink is put at the base and middle of the box, the heat source is placed below the heat sink. I need to compare the performance of various heat sink through natural air. However, I just know to set the basic thgs such as inlet and outlet..
The 2 inlets velocity i set for the box is 1m/s, outlet i set to 0 relative pressure.The default of the domain is fluid fluid domain which is the heat source. For my case, i thk my default domain should solidfluid domain, can i change the default?? Or is my region gt prob??:confused:
Since , i try many times also fail to change the default, i create another domain for the solid fluid. I run the analysis, the simulation success, bt the graph of the result i din understand. Anyone can tell me can go where to understand the graph ?? :confused:
When post the result, the flow of the air din show out... my supervisor say is time scale problems..bt i try to increase the time scare, the flow also din show out..:confused:
This is my final year project, bt tis software nvr teach in cls.. So i blur v it..anyone can teach me how to solve tis ?? :confused:
Can teach me solve the domain problem??:confused:
Any suggestion can giv me to improve the simulation?? :confused:
pls help me...

mvoss November 6, 2009 11:53

hi,
could you post a scheme of your problem? i didnīt get it. Solid Fluid??
I suppose you have a room with to inlets for air and one pressure outlet/openning AND an energy source in a solid domain at the ground of the solid domain. Are you interested in the temperature of the solid? If not, you could simplify your setup and just add a source at the former solid/fluid-interface.

And which "graph" is it that you didn't understand?
neewbie

chien87 November 6, 2009 12:25

Quote:

Originally Posted by neewbie (Post 235369)
hi,
could you post a scheme of your problem? i didnīt get it. Solid Fluid??
I suppose you have a room with to inlets for air and one pressure outlet/openning AND an energy source in a solid domain at the ground of the solid domain. Are you interested in the temperature of the solid? If not, you could simplify your setup and just add a source at the former solid/fluid-interface.

And which "graph" is it that you didn't understand?
neewbie

Yaya, my situation is like tat.. the heat source is electronic components..
i wan to know hw efficiency the heat sink can transfer d heat if in a room like that...

chien87 November 6, 2009 12:47

1st photo is my model.. The fluid fluid domain shown at the heat sink base... another rectangular box below heat sink is the heat source..

http://i187.photobucket.com/albums/x...6/untitled.jpg


2nd photo is the graph i mean..

http://i187.photobucket.com/albums/x148/lyc86/graph.jpg

Dun knw why, got heat transfer 1 n 2..momentum 1 n2 , turbulence 1 n 2... i set wrong thg??
all tis graph i din understand...wat is meaning if the heat transfer graph like that??

ghorrocks November 7, 2009 06:39

It looks like you are solving the fluid equations in both domains. If I understand you correctly you will need to set your heatsink to a solid domain.

chien87 November 7, 2009 07:02

Quote:

Originally Posted by ghorrocks (Post 235416)
It looks like you are solving the fluid equations in both domains. If I understand you correctly you will need to set your heatsink to a solid domain.

y should set it into solid domain?? can u explain bit to me??

ghorrocks November 7, 2009 07:04

You are doing a Conjugate Heat Transfer (CHT) simulation, see the heating coil tutorial for how to set them up.

chien87 November 7, 2009 07:11

The tutorial i done many times d.. I still not familiar to set the domain, subdomain and domain interface.. That y i ask experts here.. :(
Summore tis simulation have 1 heat source below d heat sink... heat source n heat sink contact... hw the set that the heat source transfer heat to heat sink?? and the heat sink dissapate the heat to air???

lyes43 February 8, 2011 04:50

re
 
Quote:

Originally Posted by chien87 (Post 235371)
Yaya, my situation is like tat.. the heat source is electronic components..
i wan to know hw efficiency the heat sink can transfer d heat if in a room like that...

hey I'm workig on simulate the mixed convection in a rectangular horizontal channel were there are heat sources (ex electronic compounents) mayb u help me to simulate that problem using any code or program
I havethe experimental results to valid my reult
saiting ur answer thx. lyes43@yahoo.com


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