Induced agitation in homogeneous bubbly flows at moderate particle Reynolds number

Induced agitation in homogeneous bubbly flows at moderate particle Reynolds number.

We investigated the agitation induced in a liquid by quasimonodispersed spherical bubbles. For Re(p) about 10 and for void fractions ranging from 0.002 to 0.1, the axial velocity fluctuation probability density functions happen to be uniquely determined by the velocity variance. In addition, the variance experiences a rupture from a nonlinear to a quasilinear increase with the volumic concentra...

Shock Waves in Transonic Channel Flows at Moderate Reynolds Numbers

The behavior of shock waves in transonic channel flows with varying Reynolds and Prandtl numbers is examined using analytical and numerical methods. It is shown that the location of the sonic line within the structure of a shock wave is independent of the Reynolds number and is coincident with the location of the corresponding discontinuous wave in the limit as the Reynolds number tends to infi...

Dissipative Particle Dynamics Modelling of Low Reynolds Number Incompressible Flows

Scalar transport in random cylinder arrays at moderate Reynolds number

This paper theoretically describes and experimentally verifies two mechanisms leading to longitudinal dispersion of a passive tracer in a random array of circular cylinders. We focus on moderate Reynolds numbers of order 10–1000, specifically the range characterized by unsteady cylinder wakes. In this regime, two mechanisms contribute to dispersion, each associated with a distinct region of the...

The effect of vortex pairing and Prandtl number on mixing in moderate Reynolds number stratified flows

Mixing resulting from Kelvin-Helmholtz instability is studied by direct numerical simulations for an intermediate Reynolds number in stratified flows where vortex pairing occurs. We investigate how the interaction of several billows changes the mixing properties. Simulations in a long domain show that only considering the interaction of two billows overestimates the amount of mixing and mixing ...