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CHT Steady State Model Comparison

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Old   October 30, 2008, 18:40
Default CHT Steady State Model Comparison
  #1
Marick Bishman
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Hi All,

I am doing a steady state CHT model of a laser device. I have a heat source in a small location in the solid and there is a water jacket inside the solid to cool down the system. The solid's outside wall is adiabatic. Now I have two different designs, in which one has 40% larger surface area for the fluid/solid interface. Since I am running steady state simulations, the total thermal energy would stay constant in both models due to balance of energy. I am wondering what metric would be appropriate to compare these two models? Heat flux? Temperature? or something else?

Thanks, Marick
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Old   October 30, 2008, 20:05
Default Re: CHT Steady State Model Comparison
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Glenn Horrocks
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Hi,

Maybe temperature at the heat source? Also things like pressure drop and flow rate in the coolant may be important. Depends on what you are doing.

Glenn Horrocks
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Old   October 30, 2008, 20:28
Default Re: CHT Steady State Model Comparison
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Marick Bishman
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Thanks Glenn. The flow rate is constant. I am interested in the design that cools down the system better (or cools it down faster if you model transient flow). So I would think the model with a larger surface area would be the answer. However I wonder how to interpret the temperature/wall heat flux on the interface between the solid and fluid? Again in a steady state solution the total thermal energy in both designs would be the same, so how could I tell show which design would be better? I am going to check the temperatures on the heat source surface. That might actually work!

Thanks again, Marick
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Old   October 31, 2008, 01:25
Default Re: CHT Steady State Model Comparison
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Glenn Horrocks
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Hi,

Well, won't the design with the best heat rejection result in the lowest temperature at the heat source? That sounds like the simplest and most direct measure to me.

Glenn Horrocks
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