I have and horizontal enclosure and it's correlation, however I would like to know the variation of temperature of the fluid between the upper and lower wall. How can I make a heat balance for the fluid?

I think I cannot assume something like the following

:

Correlation being for example : h_c=0.069RaL**1/3 Pr0.074 * k/L

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## André Lisboa 0

Hello!

I have and horizontal enclosure and it's correlation, however I would like to know the variation of temperature of the fluid between the upper and lower wall. How can I make a heat balance for the fluid?

I think I cannot assume something like the following

:

Correlation being for example : h_c=0.069RaL**1/3 Pr0.074 * k/L

Bottom surface convection: Q_c=-A*h_c*(T_bottom - T_fluid)

Upper surface convection:Q_c=-A*h_c*(T_fluid - T_upper)

Being therefore the heat balance something like: m_fluid*cp*(dT/dt)=Q_c_bottom-Q_c_upper

Do you have any suggestion?

Thank you, for your help and time

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