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June 1, 2016, 10:40 |
surface heat transfer coeff of wall flux
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New Member
Reza
Join Date: Jun 2012
Posts: 27
Rep Power: 14 |
I have a case where the outer wall of the domain is in contact with the room temperature air. as a boundary condition for this wall I have only used convection where heat transfer coefficient is set to 200 and free stream T to 300 K. Then in the monitor section, I have defined the following monitor:
Report Type: Vertex Avg Field Variable: Wall Fluxes -> Surface Heat Transfer Coef. and I have plotted this against "Flow Time". I noticed two things: 1- the magnitude of the "Surface Heat Transfer Coef." is NEGATIVE all the time (the wall initial temperature is 1273 K) 2- the "Surface Heat Transfer Coef." is NOT constant!!! while as I said, in the boundary condition for this wall I have used a constant Heat Transfer Coefficient! the negative value I imagine is due to the fact that the wall is loosing energy to free stream but can anyone tells me why the Surface Heat Tansfer Coef." monitor is not constant!!! |
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heat flux, heat tranfer coefficient, heat transfer boundary, monitoring boundary |
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