Particle-laden multiphase flows

The emphasis in this chapter is on the fruitful methodology of PIV techniques that emerge in the recent publications instead of the detailed discussions on any individual research topic of the measurement target of PIV. The purpose is to provide an overall instructive introduction and guidance to the PIV techniques and its applications particularly in the research field of multiphase flows. To this end, fruitful examples of PIV measurements of free-surface liquid flows, bubbly flows, particle-laden multiphase flows, etc., are elucidated. 

Particle-laden multiphase flows, usually turbulent, cover a wide range of applications, such as pollution control, sediment transport, combustion processes, erosion effects in gas turbines, and so on. One of the most important aspects of particle-laden turbulent flows is the mutual interactions between particles and turbulence. PIV techniques, as a powerful tool other than numerical simulation method and theoretical analysis, have been applied to this research field of particle-laden multiphase flows. Note that, dispersed-phase particles in particle-laden... 

S. V. Apte, K. Mahesh, P. Moin, and J. C. Oefelein. Large-eddy simulation of swirling particle-laden flows in a coaxial-jet combustor. Int. J. Multiphase Flow, 29(8) 1311-1331, 2003. 

Sommerfeld, M. and Qiu, H.-H., Characterization of particle-laden confined swirling flows by phase-Doppler anemometry and numerical calculation. Int. J. Multiphase Flows, 19, 1093-1127(1993)... 

Castillo, J.L. and Rosner, D.E., 1988, Non-equilibrium theory of surface deposition from particle laden dilute condensable vapour containing steam, allowing for particle thermophoresis and vapour scavenging within the laminar boundary layer. Int. J. Multiphase Flow 14, 1, 99. 

S. Apte, K. Mahesh, T. Lundgren, Accounting Fot finite-size effects in simulations of disperse particle-laden flows. International Journal of Multiphase How 34 (3) (2008) 260-271. 

Almost all thermal destruction and incineration problems of today involve multiphase situations. In two-phase flows, accurate size and velocity measurements of particles are important for a broad spectrum of applications. Solid particles are not spherical in shape. Their shape is qnite complex and far from being uniform. Complete characterization of local properties includes such attributes as particle size and number density distribntion, a velocity distribution function related to particles of different size, mean velocity of the gas phase, local gas and particle temperatures, composition of both the gas and particle phases, turbulence properties, and the Uke. In particle-laden flows the influence of turbulence on the particles and vice versa is important. The reUable and precise measurement of any one of the above properties is a nontrivial task. 

Tamburello, D. A., Amitay, M. (2008). Active manipulation of a particle-laden jet. International Journal of Multiphase Flow, 34(9), 829-851. 

Mashayek, F Jabeii, F.A. Miller, R.S. Dispersion and polydispersity of droplets in stationary isotropic turbulence, bit. J. Multiphase Flaw. 1997, 23(2), 551-555. Mashayek, F Pandya, R.V.R. Analytical description of particle/droplet-laden turbulent flows. Progress Energy Combust Sci. 2003, 29,329-378. 

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