Set heat flux BC at wall for changing temperature

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 October 4, 2018, 08:19 Set heat flux BC at wall for changing temperature #1 Member   Join Date: Jan 2018 Posts: 83 Rep Power: 5 I'm trying to simulate the heat transfer between air-flow at constant temperature and a battery cell which changes its temperature over time. I know the heat generation rate and initial temperature of the battery cell. I also know the flow velocity and the temperature of the air stream surrounding it, but I'm not quite sure how I should define the boundary condition. The heat flux depends on both temperatures, but the temperature of the battery cell is not constant (it heats up as we start drawing current), so the temperature and heat flux changes over time. Is there a way to define a time dependent battery cell temperature? Or am I missing something?

 October 4, 2018, 11:53 #2 Senior Member   Lucky Tran Join Date: Apr 2011 Location: Orlando, FL USA Posts: 4,303 Rep Power: 51 I can't really follow what you are trying to do so let's go through the steps like we are learning it for the first time. Let's go over the knowns and constraints. What is the domain? Battery only, flow only, or battery and flow? What are the physics? What are the known BC's so far? Then we can identify the needed BC's.

October 10, 2018, 09:33
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Join Date: Jan 2018
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 Originally Posted by LuckyTran I can't really follow what you are trying to do so let's go through the steps like we are learning it for the first time. Let's go over the knowns and constraints. What is the domain? Battery only, flow only, or battery and flow? What are the physics? What are the known BC's so far? Then we can identify the needed BC's.

Sorry for the extremely late response. But for now we solved it by assuming constant temperature. If we need changing temperature in the future we'll cross that bridge then. For now we're taking it one step at a time.

 Tags convection, fluent, temperature, thermal