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Help with simulating condensation from a partially filled closed glass vial in a cold fridge

Posted Jul 3, 2015, 11:20 a.m. EDT Fluid & Heat, Heat Transfer & Phase Change, Modeling Tools & Definitions, Parameters, Variables, & Functions, Results & Visualization, Studies & Solvers Version 5.1 1 Reply

Tamara Dib
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Hi!
I am having trouble with a condensation simulation. A closed glass vial at ambient temp is partially filled with 10 degC water. When it is put in a cold room with temp of 5degC, condensation occurs. I am trying to simulate the temperature change of the liquid and glass vial over time and see when condensation occurs.
I tried to do the comsol after the vacuum flask and condensation in electronic device examples but my results are no good.
Does someone have any advice? Do I have to assume convection in the liquid? Can I figure out condensation vs. time by just using the "moist air" categorization or do I have to do a phase change?

I attempted attaching my files, but it wouldn't work.

Tamara
1 Reply Last Post Aug 2, 2017, 11:05 a.m. EDT
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Hello Tamara Dib

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Joseph Rendall
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Posted: 7 years ago Aug 2, 2017, 11:05 a.m. EDT

Hi!
I am having trouble with a condensation simulation. A closed glass vial at ambient temp is partially filled with 10 degC water. When it is put in a cold room with temp of 5degC, condensation occurs. I am trying to simulate the temperature change of the liquid and glass vial over time and see when condensation occurs.
I tried to do the comsol after the vacuum flask and condensation in electronic device examples but my results are no good.
Does someone have any advice? Do I have to assume convection in the liquid? Can I figure out condensation vs. time by just using the "moist air" categorization or do I have to do a phase change?

I attempted attaching my files, but it wouldn't work.

Tamara


Hey Tamara, am working on something similar and having issues also. I had good success modeling without condensation as the fluid as a solid (just conductive heat transfer in the water) and convection on outside of flask/cup. But once getting to the condensation stage am struggling with the different physics boundary conditions. Am starting with a moist surface for the glass and wet surface for top of flask/cup but moisture transfer numbers are not reasonable. Want to make a moist air condition around the flask but quickly run out of memory when making a block of 1m^3 around cup.

Any progress?

-Joseph

[QUOTE] Hi! I am having trouble with a condensation simulation. A closed glass vial at ambient temp is partially filled with 10 degC water. When it is put in a cold room with temp of 5degC, condensation occurs. I am trying to simulate the temperature change of the liquid and glass vial over time and see when condensation occurs. I tried to do the comsol after the vacuum flask and condensation in electronic device examples but my results are no good. Does someone have any advice? Do I have to assume convection in the liquid? Can I figure out condensation vs. time by just using the "moist air" categorization or do I have to do a phase change? I attempted attaching my files, but it wouldn't work. Tamara [/QUOTE] Hey Tamara, am working on something similar and having issues also. I had good success modeling without condensation as the fluid as a solid (just conductive heat transfer in the water) and convection on outside of flask/cup. But once getting to the condensation stage am struggling with the different physics boundary conditions. Am starting with a moist surface for the glass and wet surface for top of flask/cup but moisture transfer numbers are not reasonable. Want to make a moist air condition around the flask but quickly run out of memory when making a block of 1m^3 around cup. Any progress? -Joseph

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