mtwolf
Mechanical
- Feb 14, 2007
- 3
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
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