[Ibi]

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

Ibi

[evcelica]

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?

[Ibi]

Hi,

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.

Thanks