[Stoves] mixing of gasses of different pressures

[Kirk H.]

All,

I have some questions about the mixing of gasses of different pressures.  This question arises from my efforts to mix wood gas and air in a TLUD-ND.  When two gasses of different pressures meet (such as higher pressure atmospheric air and lower pressure wood gas), there are two things that I can see happening.  One is that the higher pressure gas expands and compresses the lower pressure gas (expansion and compression).  The other is that, since gasses are permeable, being mostly open space, that the molecules of the higher pressure gas penetrate in between the molecules of the lower pressure gas (I am calling this injection, since one dictionary definition describes forcing one fluid into another by using pressure).  It seems to me that some of both will occur, some molecules hitting each other (expansion and compression) and some missing (injection).  Expansion and compression will not mix the gasses, but injection will mix them on a molecular level.  Injection would give excellent mixing since it brings the molecules together to react (not just folding them over into regions of each gas like turbulence).  I have been designing my mixing system to use injection.  Does anyone know if injection actually is real?  How much penetration is possible?  Is there another name for it that I don’t know?  I think some call it entrainment, but it seems to me that entrainment is a result of injection.  Does diffusion operate at the same time across the pressure gradient?

Kirk H.


Sent from Mail for Windows 10

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