Variations of the concentration of water components (vapor + mist) at the outlet of an open-column cold trap with time are determined under different gaseous streams of N2, He, and H2. Ice mist generated in the trap is deposited from a laminar convection flow in a vertical circular tube onto a wall surface cooled by liquid nitrogen. The mist deposition rate from the He or H2 stream is greater than that from the N2 stream at the same volumetric flow rate and inlet water vapor pressure. This is because a thermophoretic force acts on mist particles more strongly in the He and H2 streams than in the N2 stream. The experimental mist deposition rate is compared with calculations using previous theoretical equations on thermophoresis. The open-column cold trap cooled by liquid nitrogen shows good performance to remove ice mist almost completely from gaseous streams with a comparatively small velocity.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Process Chemistry and Technology
- Filtration and Separation