Eulerian phase diameter-importance?

hwet · June 29, 2015, 23:05

How is specifying the secondary phase particle diameter important, if the secondary phase is a Eulerian phase as well?
Does it have an effect on the volume fraction of the Eulerian phase if that is the only thing I am interested in?

In a single phase simulation, we do not specify the diameter of e.g air molecules/particles, why is it needed for the secondary phase in the Eulerian model then?

Thanks

stainboy · October 28, 2015, 05:21

Hi,

as far as I understand the Euler-Euler approach is dedicated to simulate two-phase flows in which one of the fractions is particle like component. The equations assumes that it have spherical shape. Gidaspow (1994) presents the equations for i.e. shear viscosity where this radius is present.

The diameter of the particles can have influence i.e. on drag force of granular phase resulting in different behaviour of this phase under given circumstances.

Abualhassan · November 20, 2015, 04:10

Dear All, please how to simulate flow of water and AL2O3 inside a tube as a mixture model?

hwet · November 20, 2015, 04:33

Err, you have to be more specific. Depending on the fraction of the aluminium oxide you can simulate it with either the Eulerian or Lagrangian approach. See the tutorials for help, this is a simple case and you will find all the help you need.

Abualhassan · November 20, 2015, 14:54

thank you, but how can I get the thermophysical properties of the nanoparticles that must I define as a secondary phase in ansys fluent

hwet · November 21, 2015, 00:43

Not sure what thermophysical properties are, but new particles types can be created in the materials tab if you know the exact particle properties or there is also a long list of particles to choose from.

Abualhassan · November 21, 2015, 02:51

from where can I get this list please

kbaker · November 22, 2015, 03:23

Abualhassan Al2O3 and base fluid (water) properties can predicted reference to temperature at inlet boundary?what temperature you set?

Abualhassan · November 22, 2015, 05:22

the inlet temperature is 293K

kbaker · November 22, 2015, 05:47

At 293 K it nearest to 295 K the properties of Al2O3 at 295 K are:

Specific Heat= 765 j/kg.K
density= 3883 kg/m3
Thermal conductivity=40 W/m.K

if you need more about Al2O3 properties search for google about it

Quote:

Originally Posted by Abualhassan

the inlet temperature is 293K

June 29, 2015, 23:05	Eulerian phase diameter-importance?	#1
hwet Senior Member Join Date: Mar 2014 Posts: 375 Rep Power: 13	How is specifying the secondary phase particle diameter important, if the secondary phase is a Eulerian phase as well? Does it have an effect on the volume fraction of the Eulerian phase if that is the only thing I am interested in? In a single phase simulation, we do not specify the diameter of e.g air molecules/particles, why is it needed for the secondary phase in the Eulerian model then? Thanks HyperNova likes this.

November 20, 2015, 04:10	2 phase flow	#3
Abualhassan New Member Mohammed Join Date: Nov 2015 Posts: 4 Rep Power: 11	Dear All, please how to simulate flow of water and AL2O3 inside a tube as a mixture model?

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October 28, 2015, 05:21		#2
stainboy New Member Jakub Pola Join Date: Feb 2011 Posts: 22 Rep Power: 15	Hi, as far as I understand the Euler-Euler approach is dedicated to simulate two-phase flows in which one of the fractions is particle like component. The equations assumes that it have spherical shape. Gidaspow (1994) presents the equations for i.e. shear viscosity where this radius is present. The diameter of the particles can have influence i.e. on drag force of granular phase resulting in different behaviour of this phase under given circumstances.

November 20, 2015, 04:33		#4
hwet Senior Member Join Date: Mar 2014 Posts: 375 Rep Power: 13	Err, you have to be more specific. Depending on the fraction of the aluminium oxide you can simulate it with either the Eulerian or Lagrangian approach. See the tutorials for help, this is a simple case and you will find all the help you need.

November 20, 2015, 14:54		#5
Abualhassan New Member Mohammed Join Date: Nov 2015 Posts: 4 Rep Power: 11	thank you, but how can I get the thermophysical properties of the nanoparticles that must I define as a secondary phase in ansys fluent

November 21, 2015, 00:43		#6
hwet Senior Member Join Date: Mar 2014 Posts: 375 Rep Power: 13	Not sure what thermophysical properties are, but new particles types can be created in the materials tab if you know the exact particle properties or there is also a long list of particles to choose from.

November 21, 2015, 02:51		#7
Abualhassan New Member Mohammed Join Date: Nov 2015 Posts: 4 Rep Power: 11	from where can I get this list please

November 22, 2015, 03:23		#8
kbaker Senior Member Khalid Baker Join Date: Mar 2009 Location: IRAQ Posts: 168 Rep Power: 17	Abualhassan Al2O3 and base fluid (water) properties can predicted reference to temperature at inlet boundary?what temperature you set?

November 22, 2015, 05:22		#9
Abualhassan New Member Mohammed Join Date: Nov 2015 Posts: 4 Rep Power: 11	the inlet temperature is 293K