In DPM, what density should be used for particles?

Messi · January 21, 2015, 10:35

Hi everyone,

I want to know that what density should be specified for particles in DPM model in Fluent?

Is it the bulk density?
If yes, why should we use bulk density?
If not, what is it and why?

Could anyone help me with this?

pakk · January 21, 2015, 11:02

You specify the density of the particles. As in: their mass divided by their volume. The volume is the volume of the sphere with the diameter that you also have to specify.

It is for you to decide if this density is equal to the bulk density. I guess that totally depends on the kind of material and particles that you are using. Normally I would say "yes", but there could be a reason for your particles to have a different "structure" than in bulk, depending on the way they were formed. They could be crystallized, be hollow, or be extra dense because the orientation of atoms/molecules is more structural than in bulk.

fishball · January 21, 2015, 20:37

Could you specific the particle material for the DPM simulation?

Quote:

Originally Posted by Messi

Hi everyone,

I want to know that what density should be specified for particles in DPM model in Fluent?

Is it the bulk density?
If yes, why should we use bulk density?
If not, what is it and why?

Could anyone help me with this?

lemmi · January 22, 2015, 06:00

the density of water if you have water is the liquid of injection.

ghost82 · January 22, 2015, 07:38

I think the density refers to particle density, not the bulk density.
This means mass of one particle divided by its volume.

adrian423 · April 10, 2015, 06:56

Some useful definitions for this thread from a Particle Characterisation Dictionary:

bulk density (noun) - bulk density of a powder is the mass per unit volume of an untapped powder sample and its volume including the volume between the particles and internal pores.

tapped density (noun) - the increased bulk density of a powder attained after a specified mechanical tapping of its container

true density (noun) - density of a particulate solid or powder excluding the interparticulate void and open pores (also called particle density)

January 21, 2015, 10:35	In DPM, what density should be used for particles?	#1
Messi New Member Happy_weekend Join Date: Jan 2014 Posts: 21 Rep Power: 12	Hi everyone, I want to know that what density should be specified for particles in DPM model in Fluent? Is it the bulk density? If yes, why should we use bulk density? If not, what is it and why? Could anyone help me with this?

January 22, 2015, 07:38		#5
ghost82 Senior Member Rick Join Date: Oct 2010 Posts: 1,016 Rep Power: 26	I think the density refers to particle density, not the bulk density. This means mass of one particle divided by its volume. __________________ Google is your friend and the same for the search button!

April 10, 2015, 06:56		#6
adrian423 New Member Adrian Smith Join Date: Apr 2015 Posts: 1 Rep Power: 0	Some useful definitions for this thread from a Particle Characterisation Dictionary: bulk density (noun) - bulk density of a powder is the mass per unit volume of an untapped powder sample and its volume including the volume between the particles and internal pores. tapped density (noun) - the increased bulk density of a powder attained after a specified mechanical tapping of its container true density (noun) - density of a particulate solid or powder excluding the interparticulate void and open pores (also called particle density) edoan likes this.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Current density visualisation (PEM fuel cell add-on module)	pchoopanya	FLUENT	10	August 21, 2023 14:33
A problem about density in liquid air definition	alloveyou	CFX	2	June 14, 2012 14:20
REAL GAS UDF	brian	FLUENT	6	September 11, 2006 08:23
Warning 097-	AB	Siemens	6	November 15, 2004 04:41
DPM - setting the density and diameter	Christian Svensson	FLUENT	0	February 14, 2003 13:44

January 21, 2015, 11:02		#2
pakk Senior Member Join Date: Nov 2013 Posts: 1,965 Rep Power: 26	You specify the density of the particles. As in: their mass divided by their volume. The volume is the volume of the sphere with the diameter that you also have to specify. It is for you to decide if this density is equal to the bulk density. I guess that totally depends on the kind of material and particles that you are using. Normally I would say "yes", but there could be a reason for your particles to have a different "structure" than in bulk, depending on the way they were formed. They could be crystallized, be hollow, or be extra dense because the orientation of atoms/molecules is more structural than in bulk.

January 22, 2015, 06:00		#4
lemmi New Member faouzi Join Date: Dec 2013 Location: ALGERIA Posts: 3 Rep Power: 12	the density of water if you have water is the liquid of injection.