Best practice for sand/water mixture ??

Michiel · March 22, 2010, 06:02

I would like to study the flow inside a dredging pump. The fluid is water which contains a high concentration of sand (30%-60%). My first thought was to use the particle transport model. But after some reading and a simple test calc this seems to take a long time to solve the problem.

Besides the particle transport, how can I model this behaviour? And which approach should be most efficient?

ghorrocks · March 22, 2010, 15:10

At such a high particle loading the Eularian approach looks attractive. Have you tried that?

Michiel · March 23, 2010, 07:00

Yes, I'm setting up some trail analysis with a multiphase model. First result looks good.
I don't know exactely how to define the material properties for the sand part and how to couple the two fluids. It seems there is not much difference between defining the sand as dispersed solid or dispersed fluid. I think because of the material properties have more influence, am i correct??

It looks like this approach will do the job.

ghorrocks · March 23, 2010, 07:05

I don't have enough knowledge of the details of each of those models to comment. My only recommendation would be to look at examples and tutorials of similar situations. For instance the fluidised bed models may be of interest, that may be useable in your case. At least it will give you some tips on how to do things. I did a multiphase course years ago on this sort of stuff but I don't use any heavy particle load flow models so I have forgotten it all - but I can recommend the advanced multiphase course if you get a chance to go on one.

Michiel · March 24, 2010, 10:40

Thanks for the tips!

Besides information on fluidised beds I also found some nice information about slurry flow modeling. At the following site you can download some papers on this subject: http://works.bepress.com/sandip_lahiri/

It seems that the model which is best for my application is described by the Phd thesis written by Sandip Kamur Lahiri. I looks like I have to do some reading these days...

jsm · March 26, 2010, 08:38

Hi Michiel,

Thanks for the link for slurry flow. It is more useful to me

March 22, 2010, 06:02	Best practice for sand/water mixture ??	#1
Michiel Member Michiel Join Date: Jul 2009 Location: The Netherlands Posts: 42 Rep Power: 17	I would like to study the flow inside a dredging pump. The fluid is water which contains a high concentration of sand (30%-60%). My first thought was to use the particle transport model. But after some reading and a simple test calc this seems to take a long time to solve the problem. Besides the particle transport, how can I model this behaviour? And which approach should be most efficient?

March 26, 2010, 08:38		#6
jsm Senior Member JSM Join Date: Mar 2009 Location: India Posts: 192 Rep Power: 20	Hi Michiel, Thanks for the link for slurry flow. It is more useful to me __________________ With regards, JSM

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March 22, 2010, 15:10		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	At such a high particle loading the Eularian approach looks attractive. Have you tried that?

March 23, 2010, 07:00		#3
Michiel Member Michiel Join Date: Jul 2009 Location: The Netherlands Posts: 42 Rep Power: 17	Yes, I'm setting up some trail analysis with a multiphase model. First result looks good. I don't know exactely how to define the material properties for the sand part and how to couple the two fluids. It seems there is not much difference between defining the sand as dispersed solid or dispersed fluid. I think because of the material properties have more influence, am i correct?? It looks like this approach will do the job.

March 23, 2010, 07:05		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	I don't have enough knowledge of the details of each of those models to comment. My only recommendation would be to look at examples and tutorials of similar situations. For instance the fluidised bed models may be of interest, that may be useable in your case. At least it will give you some tips on how to do things. I did a multiphase course years ago on this sort of stuff but I don't use any heavy particle load flow models so I have forgotten it all - but I can recommend the advanced multiphase course if you get a chance to go on one.

March 24, 2010, 10:40		#5
Michiel Member Michiel Join Date: Jul 2009 Location: The Netherlands Posts: 42 Rep Power: 17	Thanks for the tips! Besides information on fluidised beds I also found some nice information about slurry flow modeling. At the following site you can download some papers on this subject: http://works.bepress.com/sandip_lahiri/ It seems that the model which is best for my application is described by the Phd thesis written by Sandip Kamur Lahiri. I looks like I have to do some reading these days...