plz help:temprature reduces at the end of channel

sepidehkavousi · November 18, 2012, 05:38

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)

Ahmed · November 18, 2012, 08:07

you have one boundary with heat flux, the rest are all isolated,
how heat energy is going to leave your system?

sepidehkavousi · November 19, 2012, 09:24

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.

November 18, 2012, 05:38	plz help:temprature reduces at the end of channel	#1
sepidehkavousi New Member maryam Join Date: Jan 2012 Posts: 11 Rep Power: 14	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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November 18, 2012, 08:07		#2
Ahmed Senior Member Ahmed Join Date: Mar 2009 Location: NY Posts: 251 Rep Power: 18	you have one boundary with heat flux, the rest are all isolated, how heat energy is going to leave your system?

November 19, 2012, 09:24		#3
sepidehkavousi New Member maryam Join Date: Jan 2012 Posts: 11 Rep Power: 14	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.