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-   -   revolving heat pipe (http://www.cfd-online.com/Forums/fluent/84070-revolving-heat-pipe.html)

Stef06 January 19, 2011 12:54

revolving heat pipe
 
Hello! I want to model a revolving heat pipe in FLUENT to see how the fluid moves within the pipe as it revolved about an axis perpendicular to its long axis.

First, how would I go about modelling a heat pipe in gambit?
Second, how would I simulate revolving in FLUENT?

Thanks for any help!!

-mAx- January 20, 2011 02:00

there are several ways for modelling your pipe in gambit.
can yo post a sketch of your pipe.
Regarding revolving, since your will have to define the rotation axis, I would move and place your pipe untill one of gambit's default axis matches your rotation axis.
Then check single rotation frame (SRF), multiple Rotation Frame (MRF) and moving-deforming mesh (MDM), and choose your strategy

Stef06 January 20, 2011 13:32

Thanks for your reply!

I do not yet have a sketch of my pipe, but it is just going to be a straight pipe, perhaps 5-8 feet in length, with the evaporator end at a heat source and the condenser on a surface, which it will be heating. I'm just not sure how to go about making it in gambit. How will I specify the condenser, evaporator, and adiabatic sections?

Also, where are these options (SRF, MRF, MDM) located? Sorry, I am fairly new to gambit/fluent so I haven't quite figured out where everything is yet.

Thanks for any help you can offer!

-mAx- January 21, 2011 02:21

gambit and fluent are 2 sofwares:
*gambit for meshing your geometry and assigning BC to surfaces
*fluent for setting up your model (physics side)

So SRF,MRF and MDM are located in Fluent, but you need first to design and mesh your geometry
If you only want to compute your pipe, the create a disk and sweep it with and edge or a vector. But as you are talking about condenser, evaporator, etcv... I assume you also want other geometries for your computational domain
check basic gambit's tutorial

Stef06 January 25, 2011 13:55

Yeah, I only want to model the heat pipe. I want to see how the motion of revolution will affect the working fluid's motion, ie whether or not the capillary forces exerted by the wick will be strong enough to pull the liquid back if it is revolving. I'm not sure how to model the wick or if this is even possible in gambit. If you have any suggestions please let me know!

Thanks.

-mAx- January 26, 2011 02:11

in gambit just model your cylinder and take care placing your revolution axis on x,y or z-axis.
Then check tutorial 8: Using Single Rotating Reference Frame


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