Dear Bruce,

Relative humidity is all relative. Relative to the temperature of the air - gases. Are you intending to keep the gases at a high temperature? If not, the RH will keep rising as the gases cool, until the due point (100% RH), then staying at 100% while the excess moisture condenses.

The only difference between air and engine exhaust would appear to be that other gases in the exhaust possibly occupy some of the molecular spaces, meaning that less water vapor could be added (and that the RH for water only is artificially higher, that is, with LESS space for additional water).

Paul


Quoting Bruce Jackson <[email protected]>:

Hi,
Where should I start looking to calculate the relative humidity of engine
exhuast, and how much more water it could pick up?
Not sure if the same tables would work for engine exhaust as the ones for
air....
BPJ



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