difference betwen theory based solutions and numeric for heat tansfer
hi guys i have a problem with my basic analysis
my case is a simple recalculation of 2d puiseulle flow with numerical. i have surface domain 1m x 40m and i made laminar flow inside with changing velocity inlet. i added constant heat flux at top and bottom wall with same value, for example 10w/m2.
i expected that average outlet temperature have same value with calculated from theoritical equation. but it was not same.
M^dot(mass flow inlet) x Cp x (Toutlet - Tinlet) =Qdot(heat flux) x A (area)
in this equation with known mass flow inlet, Cp, heat flux and Tinlet, Toutlet can be calculated. But, calculating outlet temperature in cfd-post with drawing line at outlet and using calculator for average temp. at this line is not give same value with theory above.
so, what i still have missed, it is a very basic convection relation and it has to be give same results with any simple numerical case
it is spelled
How did you calculate the outlet average temperature?
Just to give you a tip, the left hand side of your energy balance is a thermodynamic relation, i.e. the temperatures there are Equilibrium Temperatures.
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