[will321321]

Hi Gentlemen,

I am trying to investigate the cooling of a certain solid (roughly spheres in shape) material via ambient air in cross flow heat exchange. I tried porous media with heated wall at one end to simulated the flow of material but it doesn't seem to conduct very well and the results are unrealistic.

Is this possible using porous media or should I try another approach?

Any Input is of great value.

Thank You.

-will

[ghorrocks]

Heat transfer from porous material has only been available in recent releases - V15 I think. Are you using V15?

[will321321]

Hi Sir Glenn,

Thank you for the fast response, no sir I am not using V15 so I would assume using porous media is out of the question.

Could I please ask how would you go about the problem is it where you doing the simulation?

I was considering Multiphase Eulerian model but the difficulty of doing such a simulation is out of my league.

Thank you for the input.

[ghorrocks]

For us to comment we will need to know what your flow looks like, the size and type of the particles and gas, what you are trying to get out of the simulation and how accurate.

[will321321]

Hi Sir Glenn,

Sorry for the late reply I've been busy lately.

Here is a picture of what I'm trying to simulate the one labeled Sinter cooler.



Basically Material flows at one direction and air cools the material from below it. I can simulate the fluid flow of the setup using porous media as substitute for the bed. However I am having difficulty in defining the heat to make it somewhat move with a fix heat source at the inlet of the cooler.

Thx for the help.

-will

[ghorrocks]

That puts it into context, but the specific questions in my previous post are what we need to know to be able to make constructive suggestions.

[will321321]

Hi Sir Glenn,

Thank you for having time in answering my questions.

1. Flow looks like:
The one shown in the picture tagged as "sinter cooler"

2. Size and type of the particles and gas:
a). Gas is air at 30C being blown beneath the solid material.
b). Solid material being conveyed and cooled is an earthed material assumed to have uniform diameter of 1inch and a porosity of about 0.5-0.4.

3. What you are trying to get out of the simulation:
The amount of air and temperature being recirculated for "Combustion air" and "Hot air to ignition hood" as shown in the pictures above.

4. How accurate.
Just a prediction would do, for analyzing the flow and temperature of the system for further improvements. I don't need a very accurate simulation sir just an insight of how the air is behaving and how much air is going into certain parts of the system.

-will

[ghorrocks]

I still have no idea what you are modelling - what is the size and shape? Do the particle move?

But I will guess: There are a few options to model this. If the particles move you can use a fluidised bed approach. If the particles do not move you could do it by porous material but getting the heat transfer and effective specific heat right will require thought. In some cases you might also be able to use lagrangian particles.

[will321321]

Hi Sir Glenn,

I am sorry if I cannot draw the picture clearly for you. But your guess is right the particles are moving (via grate conveyor) and air is being blown below the material.

I would try your suggestions and would update you on my progress every now and then.

Thx

-will