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Heat transfer liquid/solid inteface in the Glass of Water example
Posted Feb 28, 2014, 2:49 p.m. EST Fluid & Heat, Heat Transfer & Phase Change 0 Replies
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Im having trouble to adapt the example of the glass of water (Heat transfer module/Tutorial Models/cold_water_glass) that comes with Comsol. What I want to do is to set the temperature of the water to be hotter than the ambient and the glass too, and then let it cool. For that I did the following:
1) Change the Initial conditions for the fluid and the glass to set the proper temperatures
2) Eliminate the Temperature boundary condition at the bottom and letting it be an insulated boundary (like if the glass was set on some kind of insulating material.
What happens to occur is that convection seems not to be effective at all. The liquid at the top of the glass cool slower than liquid that is closer the bottom. Im using the rest of the simulation the same it comes by default. For 10 min of simulation the temperature is just about 25 K lower at the bottom of the fluid and just the same at the top of it.
Any idea why convection is not working properly? It is so extrage to me that the glass is cooling faster at the bottom when that boundary is thermally insulated.
Thanks in advance,
Eduardo
Hello Eduardo Ramos Fernández
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