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plz help:temprature reduces at the end of channel

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Old   November 18, 2012, 06:38
Unhappy plz help:temprature reduces at the end of channel
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maryam
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I am writing a fortran code to moled a 3d microchannel heatsink...I have a heat flux from bottomn boundary and all others are isolated. water enters at known temprature of 20C, and az the lengh of microchannel is 150 times bigger than hydrolic diameter, I udes thermally developed boundary condition (dT/dx=0) at the end of channel (nearly 5,6 nodes from the end) I see a little reduction in my temprature that leads problems in defining q(heat flux)
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Old   November 18, 2012, 09:07
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you have one boundary with heat flux, the rest are all isolated,
how heat energy is going to leave your system?
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Old   November 19, 2012, 10:24
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hi head ahmet
that boundary conditions are implied to silid part which is cooled by the fluid that flows inside ...consider fluid flows in a channel that boundaries are implied to channel outer wall and the wall thickness is big enough to be considered.
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