5. of January 2017
Brickwall, "efficiency" --- functionality.
A double-wall cylinder (with cool liquid) inside a cyclone is not just collecting condensing gases on it and making it grow, it also completely disturbs the radial circulation pattern!
It may also jeopardize any efforts of doing dry filtering!
Already, cooling the outer wall with a cooling liquid mantel is questionable, for the same reason. (collecting)
Preheating primary air on the outer cylinder wall is acceptable, as it usually does not cool the inner surface to the point as to start collecting "glueing" adhesive components.