heat flux problem
Hi, everybody, my model is a cylinder tank and can be assumed 2-D axisymmetric(the axis is centerline). The tank wall (parellel the axis) has a heat flux 70W, so I have to calculate w/m2 to correspond the unit in FLUENT, but I don't know how to determine the area, if the wall length is H, how do I get the area ?
Thank you very much. |
If the diameter of cylinder is D, the area should be A=Pi*D*H, and heat flux is 70/A.
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Thank for your reply, Sunflower.
I know the surface area is pi*D*H, and I had set the value as 70/A, but the simulation result is not good, so I am not sure whether the relation is what I want, maybe there is another problem in my case. thank you ! |
What do you mean by saying that simulation result is not good. Is the temperature too low or high? Can you describe the problems?
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You define the negative heat flux on the cylinder wall, so temperature of fluid inside the tank will become lower and lower if there is no heat source inside the fluid. So the current simulation result is reasonable. It is not what you expected but it is correct.
To maintain the temperature of fluid inside the tank to a certain level, there should be a heat source to provide the energy. My suggestion is to go back to physical model to check if something is missing. Quote:
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Are you running a transient case or steady state one? What is the meaning of stop point? I am just curious.
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