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Lee evaporation model gives unrealistic wall superheating

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Old   February 28, 2024, 02:53
Default Lee evaporation model gives unrealistic wall superheating
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marcus aurelius
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I am using Lee evaporation model to simulate saturated pool boiling case for dielectric fluid. I am using constant wall heat flux boundary condition.

When, I am plotting Heat flux vs Wall superheating, I am getting unrealistic too high wall superheating compared to the experimental value.

For example, at heat flux of 200 kW/m2, the wall superheating should be 14 C, But I am getting around 145C of superheating.

I know the lee coefficient is sensitive here. I did trial and error with different values ranging from 0.1 to 1000 but, the wall superheating never goes near to 14C, it is always above 100 (which is unrealistic).

How do I deal with this issue?
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Old   March 20, 2024, 11:44
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I guess there could be quite a few more parameter apart from simply the Lee coefficient which might be important ...

How are you modelling the bubbles, interfacial area, lift and drag / buoyancy forces?
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Old   March 21, 2024, 06:20
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Thank you for the reply. But, I have been able to manage the wall superheating near to realistic values by adding solid wall (conduction).
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boiling, evaporation condensation, fluent, lee model, multiphase

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