heat flux in fluent

CMICT · April 24, 2018, 03:02

Dear members,
I am doing flow boiling simulations and I have given linearly increasing temperature profile at the wall.
Do I want to know that how fluent calculates the heat flux at different axial locations?

Thanking all in advance

LuckyTran · April 24, 2018, 16:35

For laminar flows, it uses Fourier's law (thermal conductivity times the temperature gradient). For turbulent flows, it uses an analogous relationship but one has to keep in mind that the law of the wall is invoked.

This is not a separate calculation, but done when you setup and solve the energy equation (because the energy flux across the cell face is needed).

CMICT · April 26, 2018, 01:20

heat trannsfer coefficient value given by fluent is not matching with heat transfer coefficient calcualted by h=q/(Tw-Tl)

What would be the possible reason?

Thanking you

LuckyTran · April 26, 2018, 11:19

Did you set the reference temperature in the reference values?

If in doubt compare heat fluxes and not heat transfer coefficient.

CMICT · April 26, 2018, 12:03

Thank you for your suggestions

April 24, 2018, 03:02	heat flux in fluent	#1
CMICT New Member Chaitanya Join Date: Jun 2016 Posts: 7 Rep Power: 9	Dear members, I am doing flow boiling simulations and I have given linearly increasing temperature profile at the wall. Do I want to know that how fluent calculates the heat flux at different axial locations? Thanking all in advance

April 26, 2018, 01:20	heat transfer coefficient	#3
CMICT New Member Chaitanya Join Date: Jun 2016 Posts: 7 Rep Power: 9	heat trannsfer coefficient value given by fluent is not matching with heat transfer coefficient calcualted by h=q/(Tw-Tl) What would be the possible reason? Thanking you

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April 24, 2018, 16:35		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,674 Rep Power: 66	For laminar flows, it uses Fourier's law (thermal conductivity times the temperature gradient). For turbulent flows, it uses an analogous relationship but one has to keep in mind that the law of the wall is invoked. This is not a separate calculation, but done when you setup and solve the energy equation (because the energy flux across the cell face is needed).

April 26, 2018, 11:19		#4
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,674 Rep Power: 66	Did you set the reference temperature in the reference values? If in doubt compare heat fluxes and not heat transfer coefficient.

April 26, 2018, 12:03		#5
CMICT New Member Chaitanya Join Date: Jun 2016 Posts: 7 Rep Power: 9	Thank you for your suggestions