Two phase flow

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 March 27, 2009, 11:13 Two phase flow #1 New Member   Fernando Herrera Join Date: Mar 2009 Posts: 18 Rep Power: 10 Hi, I am working on modelling a two phase flow; one is solid and the other is a gas. I have a doubt regarding the continuity equation for the gas. I hope you can help me to get around this. In my model, solid and gas are reacting, while solid is falling due to gravity. The mass generated by the gas-solid reactions is transfered to the gas. The continuity equation for a gas is: D(rho)/Dt = 0. But, I am wondering, if for my problem, I have to add another term that represents the total mass that is added to the gas flow. I am thinking that it should look something like this: D(rho)/Dt = R Where R is the sum of all the mass generated by the gas-solid reaction. By using this equation, the SIMPLE algorithm changes a little bit. Is it ok to do this, or, should I just consider the first equation. Thanks is advance for your help.

March 27, 2009, 19:21
Two-phase flow
#2
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CFDtoy
Join Date: Mar 2009
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Hi Benzaa,
If the mass of gas is increasing or decreasing - or solid mass is dec or increasing...you would require a source term on the volume fraction eqn. If you are simply solving a eulerian gas phase eqn and a lagrangian tracker
for the solid phase, no rhs term exist.

CFDtoy

Quote:
 Originally Posted by Benzaa Hi, I am working on modelling a two phase flow; one is solid and the other is a gas. I have a doubt regarding the continuity equation for the gas. I hope you can help me to get around this. In my model, solid and gas are reacting, while solid is falling due to gravity. The mass generated by the gas-solid reactions is transfered to the gas. The continuity equation for a gas is: D(rho)/Dt = 0. But, I am wondering, if for my problem, I have to add another term that represents the total mass that is added to the gas flow. I am thinking that it should look something like this: D(rho)/Dt = R Where R is the sum of all the mass generated by the gas-solid reaction. By using this equation, the SIMPLE algorithm changes a little bit. Is it ok to do this, or, should I just consider the first equation. Thanks is advance for your help.

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