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-   -   Water solid jet simulated by DPM particles !!!! (http://www.cfd-online.com/Forums/fluent/78254-water-solid-jet-simulated-dpm-particles.html)

bohis July 16, 2010 04:22

Water solid jet simulated by DPM particles !!!!
 
Hi there!

I've been simulating water jet (diameter of 2 mm) impinging upon flat wall (100centigrades). Firstly, I did it via VOF model and results are OK especially heat fluxes agreed well with measured data.

Now I have switched the same case to DPM approach and I try to solve it with Lagrange particles (droplets). I know that I am breaking fluent limitation on an allowed volume fraction in a cell (10%), But I want to test it anyway.
I have already succesfully modeled a cold flow without heat transfer.
When I tried to simulate heat transfer with WallJet BC, I've got 70times lower values of HTC than I should have got.
Than I tried also switched to Wall Film BC with solving species transport, but here I've got negative values of HTC instead of possitive ones.
I've also written my own DPM-LAW for inert particles, but it has helped only a little.
Any suggestions ???

Thanks in advance!
Bohis

Tensian June 17, 2016 08:32

Quote:

Originally Posted by bohis (Post 267604)
Hi there!

I've been simulating water jet (diameter of 2 mm) impinging upon flat wall (100centigrades). Firstly, I did it via VOF model and results are OK especially heat fluxes agreed well with measured data.

Now I have switched the same case to DPM approach and I try to solve it with Lagrange particles (droplets). I know that I am breaking fluent limitation on an allowed volume fraction in a cell (10%), But I want to test it anyway.
I have already succesfully modeled a cold flow without heat transfer.
When I tried to simulate heat transfer with WallJet BC, I've got 70times lower values of HTC than I should have got.
Than I tried also switched to Wall Film BC with solving species transport, but here I've got negative values of HTC instead of possitive ones.
I've also written my own DPM-LAW for inert particles, but it has helped only a little.
Any suggestions ???

Thanks in advance!
Bohis



Hi Bohis,

Have you solved your problem?

I cannot solve the heat transfer between a solid body (1000K) and water particles using DPM. It seems that particles are not cooling the body, it is only the air (continuous phase) that reduces temperature of the body.

I am considering heat transfer meshing the solid and using Couple BC at the interface.

Let me know your thoughts if you have successfully solved your problem.

Thanks in advance!

T


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