I am working on nanofluids and heat transfer on minichannels experimentally, beside of my work, I want to simulate my work in comsol multiphysics numerically. so I defined a constant heat flux at the bottom area of my rectangular channel with the value of 5 watt. my channel's dimensions are 5cm length and 3 mm width and 5 mm height. I used conjucate heat transfer in laminar flow and everything was correct in details, but comsol solved it wrong and didn't show the right temperature. the fluid became warmer than the temperature of the place that we define heat flux!I changed the fluid from materials and the result was the same. what is the problem? I used mixture model and I had this problem, too!
https://www.sciencedirect.com/search?qs=heat%20flux%20problem%20in%20comsol&show=25&sortBy=relevance
Saeed Noorzadeh You should enter heat flux , rather than supplied heat.
So that , if you work in 3D model divide the supplied heat/ area so you will get the appropriate heat flux [ w/m^2]. If you work in 2D model , you should assume the depth to be 1 meter and calculate the appropriate heat flux [ w/m^2] that should entered to the program.
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