Learning Forum

[David Pimentel]

A mixture of methane and hydrogen must behave like a flame that enters through an inlet (blue), heats the inside of a chamber and then exits through an outlet on the opposite side of the chamber from the inlet (red); the chamber is shaped like a cylinder. Inside the chamber there is a thin cylindrical tube that runs along the entire length of the chamber; the tube is airtight and impenetrable, i.e., the mixture of methane and hydrogen gases cannot pass into the tube. Finally, what is sought is that the heat belonging to the gas product of the mixture of methane and hydrogen, is transmitted to the inside of the tube through its walls and thus be able to heat the contents inside the tube, which is water; it is similar to a counterflow heat exchanger.

I have tried to do it in many ways, but I have not been able to do it successfully, so I would like to ask how I could create a mixture containing methane and hydrogen? As well as the steps to follow afterwards. 

I would be very grateful if you could put your answer explicitly and in a step by step way to understand better since I am new to Ansys Student.

[Essence]

Hello,

As you mentioned you are working on methane and hydrogen flame, I would like to ask you whether the combusted products of methane and hydrogen are set as the inlet boundary condition or the mixture is getting combusted in the domain.

If the mixture is getting burnt in the domain, then you can use Species Transport or Composition PDF Transport.

[David Pimentel]

Actually it may be that the mixture is burning in the domain, because what you are mainly looking for is that simply the heat from the gas mixture, is transmitted to the water inside the hermetic tube through the walls.

On the other hand, I have not found a preset fluid in Ansys containing Methane and Hydrogen, how could I make a gas mixture containing these two gases?

I would be very grateful if you could put your answer explicitly and in a step by step way to understand better since I am new to Ansys Student.

[Essence]

Hello,

You need to input the fuel species in the PDF transport or import Chemkin mechanism for the combustion. 

 

I would highly recommend you to undergo the training or refer to the tutorials,  AIC courses and Ansys guide (documentation) which are available in the Ansys portal. It is difficult to provide step by step guidance on the application you are working on as this will be a huge content to write here.

Therefore, it would be better if you would refer the documentation, which will give you good idea on resolving the issue.