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THERM Convection based on Temperature Difference Equation

THERM Convection based on Temperature Difference Equation

THERM Convection based on Temperature Difference Equation

(OP)
Hi,

I'm doing a transient analysis in which a large pressure vessel (diameter of about 20 feet) is being cooled from 550 F to 200 F by natural convection on the inside.  This cooling is due to a decreasing bulk temperature (-100 F/hour).  I have a correlation, which I must use to match prior art, for the film coefficient of:

h = constant * (Tsurface - Tbulk)^(1/3)

Currently, I'm just estimating a film coefficient with dT = 100, but this film coefficient sometimes underestimates the heat transfer by as much as 40%.  Is there a simple way to enter an equation which calculates the film coefficient at each substep? Or is there a way to calculate heat transfer at a surface due to a user specified equation rather than conduction, convection, or radiation?

I'm using ANSYS Mechanical v10.0

Thanks in advance,
Mike

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