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Applying a Negative Ambient Temperature

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Old   February 23, 2022, 04:00
Default Applying a Negative Ambient Temperature
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Good morning all,

1. Using transient thermal analysis in ANSYS, I am trying to use an air ambient temperature of -10 degree Celsius to freeze an alum sludge with an initial temperature of 11.6 degree celsius.
2. I have solve the physics but the achieved result on the gradient plot is showing that I am using the alum sludge to cool with air. which is not what I expected.
3. I expected my refrigerant chamber with an ambient negative value of -10 degree Celsius to be on permanent blue and the alum sludge on red because I am using an ambient temp of -10 to cool down an initial temperature of 11 degree Celsius.

Please see the attached schematic 2D description. I will appreciate hearing from you.

Thank You

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Old   February 24, 2022, 15:15
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Sound like you have something wrong in your setup, which is difficult for us to diagnose.
First off, how did you set initial conditions for temperature of each body?
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Old   February 25, 2022, 06:35
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Thank you for getting back to me. I selected my mud tray and the refrigerant chamber together for the convection boundary condition and the mud tray alone for the temperature since I am using a negative ambient temperature to freeze the initial temperature of my mud.

I think having a separate convection BC for the cooling refrigerant and mud might help with assigning a different temperature BC for them and creating a negative heat flux since I want to remove heat from the mud to make it freeze. I await your response.

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