Vacuum Through Venturi Operated on Compressed Air

Air pressure and nozzle diameter being equal, higher the compressed air temp, due to viscosity difference would give higher air (volume/time) flow => higher linear nozzle air speed, => higher max generated vacuum. But I wouldn't expect linearities at that high speeds. S.M.

Not sure what viscosity has to do with it, but you imply higher compressed air temperature gives lower viscosity, hence higher flow. Actually, unlike most liquids, air viscosity increases with increasing temperature, as predicted by kinetic theory. From data I have it varies roughly as T^0.72.

I wouldn't expect any change in vacuum with air temperature, air pressure and nozzle diameter being equal. Higher temperature means lower density, hence actual volume flow higher, proportional to 1/√ρ, standard (or mass) flow lower by √ρ. But in producing vacuum the same effect works in reverse, leaving vacuum unchanged. That's my take on it anyway.

Codey