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So I'm having trouble with understanding the differences between the constant heat flux and constant temperature condition when not in a textbook. Some research I have begun working on involves a strip of heat tape sandwiched between two aluminum plates which are allowed to reach steady state. When I think about this conceptually it seems like the plates would eventually reach a constant temperature condition, but at the same time it makes sense to me that it is a constant heat flux condition due to the constant heat transfer at the area in contact with the heat tape.

So my question is what am I missing conceptually to be able to easily determine what the conditions for this setup is? If it is constant heat flux then how would a constant temperature obtained instead? I would greatly appreciate any input that could help me clear this mental confliction.