An experimental study of particle-laden jet interactions with cocurrent flows

The interactions of particle laden jet with cocurrent flow was studied experimentally. To improve sorbent utilization, in induct flue gas desulfurization processes where sorbent particle-laden jet is injected into cocurrent flowing flue gas, an understanding of particle and fluid interaction within the turbulent mixing zone is necessary. To improve the understanding of this phenomenon, one needs to obtain measurements of the particle size, velocity, concentration, and gas phase velocity within the shear layer region of particle-laden jet.; A particle injection test facility was designed specifically to study the interaction of particle laden jets using non-intrusive, laser-based optical techniques. Spherical glass particles in the size range of 2-100 {dollar}mu{dollar}m were used. The mass loading was varied between 0 to 10. Particle Dynamics Analyzer, which utilizes phase Doppler interferometry and laser Doppler anemometry was used for measuring the particle velocities, sizes, and concentration as well as gas phase velocities in the flow field. Phase discrimination between the particle phase and gas phase was accomplished by utilizing particle velocity and size statistics.; Single phase, particle and gas phases mean velocities and fluctuating turbulent intensities, and concentration profiles were obtained. Single phase velocity measurements were used as baseline data for comparison with particle laden flows. The decay rate of mean gas phase centerline velocity for particle laden flows less than that for single phase flows. This resulted from the momentum transfer from particles to the gas phase. The axial and radial rms velocities of the particle and gas phases decrease with increase in mass loading. The spreading rate of particle laden jet is also reduced. This decrease resulted from the reduction in the radial fluctuating velocity. Entrainment increases with higher jet velocity and reduced mass loading. Higher mass loading reduces the turbulence level; therefore there is a reduction in mixing and entrainment. For the range of particle sizes used, larger particles tend to concentrate around the centerline of the jet. For higher mass loading the particles are concentrated in a smaller radial distance and there is a resulting reduction in dispersion and mixing of particles.