Direct Numerical Simulation of a Perturbed, Turbulent Mixing Layer

Nanoparticle coagulation via a Navier–Stokes/nodal methodology: Evolution of the particle field

“…A temporal mixing layer is formed when two parallel streams which travel in the opposite direction meet (Riley & Metcalfe, 1980;Sandham & Reynolds, 1991;Moser & Rogers, 1993). The streams mix and entrain fluid through large-scale coherent structures (Brown & Roshko, 1974;Roshko, 1976;Cain, Reynolds, & Ferziger, 1981;Bernal & Roshko, 1986;Miller, Madnia, & Givi, 1994).…”

Instabilities in Near Field of Turbulent Jets and Their Dependence on Initial Conditions and Reynolds Number

“…It was also shown that at the resonant position both the fundamental and subharmonic waves have the same phase speed of 0.5 the jet velocity, a necessary requirement for a resonance mechanism. In addition to the equal phase speeds, the fundamental and subharmonic modes must be out of phase for the pairing to occur, as demonstrated by Riley and Metcalfe (1980). In addition to the subharmonic resonance, another set of instabilities was observed.…”

Effects of Turbulent Fluctuations on Nanoparticle Coagulation in Shear Flows

“…The moment M 1 is the same in all three cases as it is proportional to the particle mass. Due the initial perturbations placed on the velocity field, eddies form, grow in size, pair, and merge (Riley and Metcalfe 1980;Metcalfe et al 1987;Sandham and Reynolds 1991;Settumba and Garrick 2003). The large-scale motions of the eddies expedite mixing between the particle-laden and particlefree streams, affecting the particle concentrations through dilution of the particle-rich stream and dispersion of particles into the particle-free stream (Garrick et al 2006).…”