simulation of particles transport and deposition in a pipe flow

engineer.iman · November 13, 2013, 22:26

Hi every body,
I'm a CFD beginner. I need to use CFX for modelling water flowing in a 0.45 m diameter, 5 m long pipe with oily semi-solid particles flowing in it. the pipe should be inclined and some of the particles will stick to the interior walls (forming deposits) and some will just move on with the flow.
I would like to know what are all the necessary data/conditions that I need to have in order to complete my model, if I want to try the system in steady and unsteady, transient and turbulent mode. 2D and 3D

thanks in advance

ghorrocks · November 14, 2013, 04:14

You have to understand the physics of all the important interactions - drag forces on the droplets, what causes them to stick to clump on the walls, what causes them to move along the walls with the flow.

Then you can choose the models in CFX suitable for your fluid and model it. You might have to develop your own model for things like wall clumping and dragging.

AKHILESH S L · November 16, 2013, 03:45

one thing i can say your water is the continuous fluid semi-solid particles is the dispersed solid. both are coming in the same domain rit? you have to find out the drag acting on the solid particles. can you please explain it in more detail?

engineer.iman · November 17, 2013, 20:41

the semi-solid oil and grease particles are either floating on the surface or dispersed within the fluid, assuming a full pipe flow, they will be within the same domain. the reasons for deposition is the sticky surface property of the particles and the roughness of the old clay pipe that lead to the first deposition layer leading to more subsequent deposition.
wan der Waals interactions between the oil and grease particles are also part of the scenario.
another part of the problem is the boundary conditions. I'm not sure how to decide the boundary conditions in CFX for this case since I don't have experimental data on hands, any advice?

AKHILESH S L · November 17, 2013, 23:58

i think you have to model your own subroutine for modeling this particular type of flow.

November 13, 2013, 22:26	simulation of particles transport and deposition in a pipe flow	#1
engineer.iman Member Iman Join Date: Nov 2013 Posts: 37 Rep Power: 12	Hi every body, I'm a CFD beginner. I need to use CFX for modelling water flowing in a 0.45 m diameter, 5 m long pipe with oily semi-solid particles flowing in it. the pipe should be inclined and some of the particles will stick to the interior walls (forming deposits) and some will just move on with the flow. I would like to know what are all the necessary data/conditions that I need to have in order to complete my model, if I want to try the system in steady and unsteady, transient and turbulent mode. 2D and 3D thanks in advance

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November 14, 2013, 04:14		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	You have to understand the physics of all the important interactions - drag forces on the droplets, what causes them to stick to clump on the walls, what causes them to move along the walls with the flow. Then you can choose the models in CFX suitable for your fluid and model it. You might have to develop your own model for things like wall clumping and dragging.

November 16, 2013, 03:45		#3
AKHILESH S L New Member AKHILESH S L Join Date: Sep 2013 Location: Trivandrum Posts: 29 Rep Power: 12	one thing i can say your water is the continuous fluid semi-solid particles is the dispersed solid. both are coming in the same domain rit? you have to find out the drag acting on the solid particles. can you please explain it in more detail?

November 17, 2013, 20:41		#4
engineer.iman Member Iman Join Date: Nov 2013 Posts: 37 Rep Power: 12	the semi-solid oil and grease particles are either floating on the surface or dispersed within the fluid, assuming a full pipe flow, they will be within the same domain. the reasons for deposition is the sticky surface property of the particles and the roughness of the old clay pipe that lead to the first deposition layer leading to more subsequent deposition. wan der Waals interactions between the oil and grease particles are also part of the scenario. another part of the problem is the boundary conditions. I'm not sure how to decide the boundary conditions in CFX for this case since I don't have experimental data on hands, any advice?

November 17, 2013, 23:58		#5
AKHILESH S L New Member AKHILESH S L Join Date: Sep 2013 Location: Trivandrum Posts: 29 Rep Power: 12	i think you have to model your own subroutine for modeling this particular type of flow.