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how to simulate exchanger?

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Old   October 7, 2008, 11:31
Default how to simulate exchanger?
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my model is: the hot-water pipe has small diameter (inner) , and the cold-water pipe has big diameter (outer). the heat tranfer from the hot-water through the steel pipe to the cold-water. boundary condition: (1)fliud1 (hot-water): velocity-inlet(0.1m/s) , outflow , T=640K (2)fliud2 (cold-water): velocity-inlet (0.1m/s), outflow , T=610K (3)solid : steel (4)wall (outside of cold-water pipe ): heat flux=0 because the Re<2300 , the problem is a liminar flow. the model seems no error i think. however, the reslut is dispointed me. the residual is always flat and very large;the cold water flow incorrect. i don't kown why it is , and i guess two reasons: (1) the model set has mistake or (2) fluent is not excellent to simulate this kind of problem which is the soild and fluid heat transfer couping
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Old   October 8, 2008, 09:59
Default Re: how to simulate exchanger?
chandra manik
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What residual?, energy residual? If you wan heat transfer occured in this model, you have to beware on the boundary wall between two difference material " Shell boundary" where the konduction or convetion constant need to be stated. You also have to turn on the energy solver.

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Old   October 9, 2008, 07:39
Default Re: how to simulate exchanger?
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i have already turned on the energy solver
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