When setting the boundary condition for the external wall of a cooling channel that contains hot and cold fluids between them a plate, what is the best condition for calculating the Nusselt number in ANSYS fluent? is it the setting of a constant temperature or a constant heat flux or a thermal insulation condition and how much does each of these conditions affect the value of Nusselt number and which gives us Better accuracy results if the channel is part of a multi-channel exchanger. Thank you in advance

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