# 2D simulation for mixing two non-reacting gases

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 July 5, 2011, 08:11 2D simulation for mixing two non-reacting gases #1 New Member   arun mishra Join Date: Jul 2011 Posts: 3 Rep Power: 7 I want to carry out a simulation for mixing two non-reacting gases, methane and hydrogen. Methane is allowed to enter a mixing chamber with a diameter of 35mm by a tube of 7 mm dia and hydrogen is allowed to enter the chamber from two tubes of 7mm dia normal to the methane tube. Both the gases are at 200 bar. Can anyone suggest me how to do the simulation for these gases. I need minimum pressure drop and maximum and homogenuity in the resulting gases.

 July 5, 2011, 09:01 #2 Member   Adrien Lemoine Join Date: Jun 2011 Location: Paris,France Posts: 31 Rep Power: 7 The mutliphase models that should be used are : Volume of Fluid or Eulerian. eulerian is a bit slower. __________________ ------------------------------------------- Plz add reputation if the answer is correct A cœur vaillant rien d'impossible ------------------------------------------

July 5, 2011, 09:51
#3
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arun mishra
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Quote:
 Originally Posted by AdrienL The mutliphase models that should be used are : Volume of Fluid or Eulerian. eulerian is a bit slower.
I am using two diff gases(methane and hydrogen for my model). I dont think the multiphase model would be useful here.

 July 5, 2011, 10:20 #4 Member   Adrien Lemoine Join Date: Jun 2011 Location: Paris,France Posts: 31 Rep Power: 7 My bad, you can't use Volume of Fluid but Eulerian works perfectly __________________ ------------------------------------------- Plz add reputation if the answer is correct A cœur vaillant rien d'impossible ------------------------------------------

 December 13, 2011, 16:51 #5 New Member   Join Date: Dec 2009 Location: Italy Posts: 23 Rep Power: 8 Dear Arun, how did you solve your mixing analysis? I am facing the same problem, I have a nozzle ejecting air into a pipe containing gas. I am interested in the mixing of the two materials. How can I handle this? Which model should I activate in Fluent (Transport of species, Eulerian, VOF, ...)? Thank you very much for your reply. Sergio

 December 14, 2011, 13:01 Re #6 Member   Domenico Join Date: Sep 2011 Location: Atlanta Posts: 39 Rep Power: 7 Hello Why not multispecies (with no reaction) only? For two gas species, you'll have two continuity equations, but only one for momentum, and energy. The turbulent mixing will do the rest Regards

 December 16, 2011, 06:21 #7 New Member   Join Date: Dec 2009 Location: Italy Posts: 23 Rep Power: 8 Dear Doronzo, I am not familiar with multispecies model, but it seems to me the Eulerian multiphase model can account for fluid-fluid mixing (even if both fluids are gases) and the multispecies is dedicated more to chemical species (i.e., for each gas I have to define its chemical composition). Since I am not interested in single species distribution (each gas is composed of several species), I guess the multiphase is the most appropriate. What is your opinion on this? Regards

 December 16, 2011, 08:50 Re #8 Member   Domenico Join Date: Sep 2011 Location: Atlanta Posts: 39 Rep Power: 7 are the two fluids miscibile or immiscible? regards

 December 16, 2011, 11:05 #9 New Member   Join Date: Dec 2009 Location: Italy Posts: 23 Rep Power: 8 One fluid is air, the other is syngas composed of n2, 02, co, co2 and other species. They are miscible in the sense that they can penetrate each other but they are not reacting. Which model would you use, multispecies or multiphase? If you suggest to use the multispecies, should I define each single species for both fluids? Thank you very much! Serse

 December 16, 2011, 15:48 Re #10 Member   Domenico Join Date: Sep 2011 Location: Atlanta Posts: 39 Rep Power: 7 I would use multispecies, with two species, one/fluid. The non-reacting mixing will probably depend on turbulent mixing, and in each cell you will have volume fractions for the two fluids. In case of immiscible fluids, VoF would be probably necessary, although Eulerian multiphase can be also used, but I would use multispecies only

 December 20, 2011, 09:11 #11 New Member   Join Date: Dec 2009 Location: Italy Posts: 23 Rep Power: 8 Hello, I am using the species transport model how you suggested, and it works perfectly! I specified one syngas-air mixture where syngas is composed of one fluid (syngas) and air is composed of two fluids (nitrogen and oxygen as from Fluent database). The mixture has ideal gas behaviour for density calculation as air is entering the system through a nozzle where it undergoes adiabatic expansion. The solver is density-based. I have also included the k-e realizable turbulent model. Next step will be to include transfer of heat from/to walls by convection and radiation. If you have any tip to provide on this, please reply. Thank you very much. antara likes this.

 November 22, 2012, 19:18 mixing air and methan in a tee #12 New Member   shahrouz mohagheghian Join Date: Nov 2011 Posts: 2 Rep Power: 0 Hi I am working on a project, air and methane are entering a tee from two different sides and the mixture is leaving the geometry from the other side, can eny one help me with it?

 April 26, 2013, 16:14 #13 New Member   arun mishra Join Date: Jul 2011 Posts: 3 Rep Power: 7 Hello every1.. I have stopped working on Fluent. And sorry every1 for not being able to reply as I have not used this forum for quite a long time

 January 30, 2015, 04:53 qubic chamber with hydrogen release #14 New Member   Join Date: Jul 2013 Posts: 16 Rep Power: 5 Hi every1 I have similar prob my problem is a qubic chamber filled by air and hydrogen leaks to it from a small hole in the bottom, what model is appropriate 4 this prob regards

 July 27, 2015, 05:59 Non reactive gaseous simulation #15 New Member   Join Date: Jul 2015 Posts: 10 Rep Power: 3 Hello I intend to study the mixing of two gases in aa non-reactive environment and i find the current discussion related to the activity I am pursuing. Firstly, as per the discussion till now in this forum, I guess species model is more appropriate. Secondly, using the model and the boundary conditions, which result could we expect and how would we quantify the extent of mixing using these results. Lastly, can anyone upload a related tutorial in Fluent/CFX platform. Thank you in advance

 August 16, 2015, 11:25 Gas Mixing Problem #16 New Member   Join Date: Aug 2015 Posts: 2 Rep Power: 0 [QUOTE=SerSe;336468]Hello, I am trying to solve a problem that you have attended earlier. On this regard I need your suggestion and guideline. I am trying to check the turbulence intensity of two non reacting fluid after mixing and each of them have different composition. AIR- Biogas Mixing in a T- Type Mixer. I am not able to edit the Material and the parameters of biogas in Ansys. Please suggest me which model I should prefer. I am trying to solve it with species transport model but net able to set the properties of the biogas and air science there is no provision. please suggest me some material which is specific on this regard. Thank you very much.

August 16, 2015, 11:26
#17
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Quote:
 Originally Posted by SerSe Hello, I am using the species transport model how you suggested, and it works perfectly! I specified one syngas-air mixture where syngas is composed of one fluid (syngas) and air is composed of two fluids (nitrogen and oxygen as from Fluent database). The mixture has ideal gas behaviour for density calculation as air is entering the system through a nozzle where it undergoes adiabatic expansion. The solver is density-based. I have also included the k-e realizable turbulent model. Next step will be to include transfer of heat from/to walls by convection and radiation. If you have any tip to provide on this, please reply. Thank you very much.
I am trying to solve a problem that you have attended earlier. On this regard I need your suggestion and guideline. I am trying to check the turbulence intensity of two non reacting fluid after mixing and each of them have different composition. AIR- Biogas Mixing in a T- Type Mixer. I am not able to edit the Material and the parameters of biogas in Ansys. Please suggest me which model I should prefer. I am trying to solve it with species transport model but net able to set the properties of the biogas and air science there is no provision. please suggest me some material which is specific on this regard.

 August 3, 2016, 08:31 help #18 New Member   kaveh Join Date: Jul 2016 Posts: 1 Rep Power: 0 Hi there, I'm working on the same project. and I have some problems. which model of turbulence model is better? k-e or k-w and should I change the constant of intensity of turbulence? how?

 Tags 2d simulation, mixing gases, non-reactive

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