ANALYSIS OF THE PARTICLES’ MOVEMENT OVER THE FLAT AND PROFILED ROTATING DISCS SURFACE IN THE VELOCITY LAYER OF THE VISCOUS GAS

Experiments on the rotating in the air cones with vertex angle β = 120º and flat disc shown that on frequencies Ω ≥ 2.5 hertz exists a qualitative difference in movement for the particles with diameters d ≈ 1 mm and d ≈ 0.1 mm. The particles with d ≈ 0.1 mm move in the near-surface region, the particles with d ≈ 1 mm jump up to 3 cm. Comparison of the spherical and aspheric (ellipsoid with axles d, d and ⁴/₃ d) particles' kinematics moving shown the inevitability of the large particles jump occurrence. Large particles come to self-oscillation regime by reason of periodically appearance of the Magnus force. Small particles are localized in the velocity layer.

Keywords:
rotary heat exchanger, dehydration, thermal decomposition, boundary layer, viscous friction, Magnus force.
УДК 532.526.2 + 533.6.12

ANALYSIS OF THE PARTICLES’ MOVEMENT OVER THE FLAT AND PROFILED ROTATING DISCS SURFACE IN THE VELOCITY LAYER OF THE VISCOUS GAS