State Newton’s law of convection.

Heat transfer from the moving fluid to solid surface is given by the equation.
Q = h A = [Tw – T∞]
This equation is referred to as Newton’s law of cooling.
Where h = Local heat transfer coefficient in W/m2K.
A = Surface area in m2
.
Tw = Surface [or] Wall temperature in K.
T∞ = Temperature of fluid in K.

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