Detailed Flow Patterns in the Cylindrical Cyclone Dust Collector

Abstract

Up to this time many papaers concerning the distributions of the tangential, axial and radial velocities, the Reynolds stress and also the equi-flow rate lines, the particle concentration, the fractional collection efficiency and the collection efficiency in the various types of the cyclone dust collectors were reported. In this paper, basing upon the results of the measurements of the distributions of the axial velocities in the cylindrical cyclone of the diameter D₁=139.5 mm and the total length H=385 mm with a cylindrical Pitot-tube for Reynolds number Rec=Q₀/H_i ν =2159(V_o=5.0 m/s), 3023 (V_o=7.0 m/s) and 4318(V_o=10.0m/s), the detailed equi-flow rate lines were shown. From these results, the remarkable non-symmetrical flow patterns were shown and also from the results of the tangential velocities, the fluid dynamical unstable region due to the non-symmetricalrotational flow was shown. In addition to this, a result of theReynolds stress $z=-\rho \overline{{{\nu }_{\theta }}{{\nu }_{z}}}$ for V_o=10.0 m/s measured with a hot-wire with X-probe is shown. Here Q_o(m³/s) is the flow rate into the cyclone, H_i(m) is the imaginary cylindrical length, ν (m²/s) is the kinematic viscosity of air, V_o(m/s) is the mean inlet velocity in the inlet pipe, ρ(kg/m³) is the density of air.