抄録
In this research, we experimentally and numerically examine the flow characteristics of entrained air and powder jet. A phase- Doppler anemometer is used for the measurement of axial velocity of entrained air and particle. It is found that the axial velocity profiles of the entrained air shows the maximum value at the center-line and decreases toward outer edge. The flow region of entrained air spreads into a particle free space. The center-line velocity of entrained air increases with increasing distance from the orifice and decreases after it takes the maximum value. The spread of the entrained air is very small compared with that of the single-phase turbulent jet. The numerical simulation is performed based on the Lagrangian modeling for particles and Eulerian modeling for air flow. We consider particle-particle collision, drag force, gravity force and transverse force due to the particle spin and to the velocity gradient of air flow, and apply a k-ε model. The present simulation qualitatively explains our measurement in terms of particle and air velocity profiles and jet spreading.
