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BC and convective currents
Posted 14.03.2011, 23:34 GMT-4 Heat Transfer & Phase Change, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 4.0 0 Replies
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I'm a rookie in COMSOL and I need some help please in a heat transfer steady state problem.
I have a cylinder (conductive medium) being heated on an external surface and a sphere (water) inside that cylinder. The GOAL is to study the convection currents causes by the external heating. I understand enough the heat transfer in solids but not so much in liquids. I'm using the "Coefficinet Form PDE" and not the heat transfer modules.
Questions:
1. How can I apply continuity BC between the interfaces, namely, the same temperature and the same heat flux in the interface: outer sphere/inner cylinder?
2. Which is the best way to study the convection currents (in the desired range of temperatures the water remains in the liquid state)? Do I need to use the Navier-Stokes equations? God no! :)
3. To heat the external surface I need to apply a Neuman or Robin BC, how if I only have the option of Dirichlet BC?
Thanks so much!
Note: In the model I used a Dirichlet BC in the opposite external surface (T=300K) and in the lateral walls a zero flux.
Hello Dario Rodrigues
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