- **Main CFD Forum**
(*http://www.cfd-online.com/Forums/main/*)

- - **difference betwen theory based solutions and numeric for heat tansfer**
(*http://www.cfd-online.com/Forums/main/127607-difference-betwen-theory-based-solutions-numeric-heat-tansfer.html*)

difference betwen theory based solutions and numeric for heat tansferhi 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
PoiseuilleHow 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. |

All times are GMT -4. The time now is 19:09. |