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August 23, 2014, 10:18 |
Concentration of species
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#1 |
New Member
A Alansari
Join Date: Jul 2014
Posts: 5
Rep Power: 11 |
Hello!
I would like some clarification on how to control the concentration of a species being injected into a system. The species is just a pulse tracer injected at the inlet and the concentration is being monitored at the outlet vs time. The way I do this is by first solving the steady state solution with the species transport equation turned off, then I turn off the flow and turbulence equations and turn on the species transport equation. I go to my boundary conditions and at the inlet set the mass fraction of the species to 1. I would run a few transient steps to inject the tracer, then go back and set the mass fraction of the species back to 0. Finally I would resume the calculation until all of the tracer exits the system. The problem I'm facing here is that the concentrations that I'm seeing are very high ~2M(mol/L), where in the real world the concentrations used don't typically exceed 0.2M... |
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