(247e) New Perspectives on Fluid-Phase Turbulence Modulation by Particles
AIChE Annual Meeting
2008
2008 Annual Meeting
Particle Technology Forum
Session in Honor of George Klinzing’S 70th Birthday
Tuesday, November 18, 2008 - 9:50am to 10:10am
This presentation will review existing ?rules of thumb' for fluid-phase turbulence modulation in the presence of a dilute concentration of particles, such as found in pneumatic conveying systems. These ?rules of thumb' relate turbulence modulation behavior to turbulent eddy length scale or particle Reynolds number. However, experimental data indicate that turbulence modulation is dependent on additional variables such as the macroscale Reynolds number. For example, it has been shown that gas-phase turbulence intensity which is attenuated with respect to the single phase flow at low Reynolds number, for a given particle loading, is then enhanced at higher Reynolds number. Hence, turbulence modulation behavior is much more complex than described by the simple rules of thumb. This presentation will review some of the new data on turbulence modulation and discuss some new possible mechanisms for the physical origin of fluid turbulence modulation behavior.