## AIM Tutorials

#### Simulation of natural convective heat transfer

• Crammer1
Subscriber

i have modeled a natural circulation loop consisting a heat source, heat sink and adiabatic sections with liquid water as working fluid in ansys fluent. the length of heat source i used is bigger than the heat sink. my questions are: it is possible that length of heat source be higher than that of heat sink. my second is that how can i calculate outlet temperature of the heat sink in the ansys fluent

• peteroznewman
Subscriber

I don't use AIM so maybe the terminology there is different. What is the specific boundary condition you used, was it temperature or heat flux?   What version of AIM are you using?

• Crammer1
Subscriber

sorry what do you mean by AIM. i used temperature, 150c in heat sink and 170c in heat source. however, i used boussineq approximation.

• peteroznewman
Subscriber

You posted this discussion in the ANSYS AIM Tutorials section.  AIM is a different user interface from Workbench but they both use the same back-end Fluent solver.  If you are using Workbench, then I can move this discussion to the Fluid Dynamics section where more people will see it.

If you have a loop, then where is the inlet and outlet? Please insert an image into your reply.

Yes, you can have the heat source and heat sink be different lengths.

I don't understand what you are asking when you say "how can i calculate outlet temperature of the heat sink". You specified the heat sink temperature. You can plot the temperature of water around the loop between the heat source and heat sink, but each of those are maintained at the specified temperature.

• Crammer1
Subscriber

yes i'm using ansys work bench. i created my domain in space claim then, meshed it in ansys work benched i want to know how to find coolant temperature (T2) as i will use it to find RAYLEIGH NUMBER.

• Crammer1
Subscriber

yes i'm using ansys work bench. i created my domain in space claim then, meshed it in ansys work benched i want to know how to find coolant temperature (T2) as i will use it to find RAYLEIGH NUMBER.

• peteroznewman
Subscriber

The ANSYS Staff who answer CFD questions are on holiday until 2020.

In Workbench, right mouse click on Model and Clear Generated Data. That will delete the mesh.  Then do File, Save, then do File, Archive... don't include Results. Then the size of the .wbpz file will be < 120 MB and you can use the Attach button to upload that file AFTER you reply.  Say what version of ANSYS you are using.