Particle laden turbulent flows occur in a variety of industrial applications. While the numerical simulation of such flows has seen significant advances in recent years, it still remains a challenging problem. Many studies investigated the rheology of dense suspensions in laminar flows as well as the dynamics of point-particles in turbulence. Here wewill present results on the development of nu...

0 10 20 30 −50 0 50 100 150 r (mm) U (m /s ) x/DB = 0.2 0 10 20 30 −10 −5 0 5 10 r (mm) V (m /s ) x/DB = 0.2 0 10 20 30 −50 0 50 100 150 r (mm) U (m /s ) x/DB = 0.6 0 10 20 30 −10 −5 0 5 10 r (mm) V (m /s ) x/DB = 0.6 0 10 20 30 −50 0 50 100 150 r (mm) U (m /s ) x/DB = 1.4 0 10 20 30 −10 −5 0 5 10 x/DB = 1.4 r (mm) V (m /s ) Experiment Raman et al. LES/HPDF Liu et al. Merci et al. Fig. 1. Mean ...

This article examines entropy generation in the peristaltic transport of nanofluid in a channel with flexible walls. Single walled carbon nanotubes (SWCNT) and multiple walled carbon nanotubes (MWCNT) with water as base fluid are utilized in this study. Mixed convection is also considered in the present analysis. Viscous dissipation effect is present. Moreover, slip conditions are encountered f...

OBJECTIVE We wanted to evaluate the performance of prospective electrocardiogram (ECG)-gated axial scans for assessing coronary stents as compared with retrospective ECG-gated helical scans. MATERIALS AND METHODS As for a vascular model of the coronary artery, a tube of approximately 2.5-mm inner diameter was adopted and as for stents, three (Bx-Velocity, Express2, and Micro Driver) different...

A rotating suspension of nonbuoyant particles can develop striking inhomogeneities in particle concentration, with regular bands of high and low concentration along the symmetry axis. We report Stokes-flow simulations showing that the formation of axial bands is correlated with an inhomogeneous particle distribution in the radial plane. An order parameter, based on the average angular velocity ...

We study the effects of the axial component of the shear stress on unsteady pipeline flows. We show that the axial component of the shear stress should be introduced in the modeling of unsteady flows, and as a numerical model, we propose a one-dimensional momentum equation in which a term containing the second derivative of the velocity with respect to space is introduced. The momentum equation...

Consider a Newtonian fluid of kinematic viscosity ν and density ρ confined in a finite cylinder of radius R and height H, whose sidewall oscillates harmonically in the axial direction, with period T and maximum axial velocity Vmax, while the top and bottom lids remain at rest. There are three non-dimensional parameters in this problem: the aspect ratio, Γ = H/R, the Reynolds number, Re = VmaxR/...

Transport model of droplets injected axially or transversely into a plasma jet is presented. The droplets contain a ceramic precursor that precipitates in the vaporizing droplets. Droplet temperature and solute concentration distributions were predicted to estimate precipitation zones based on a homogeneous nucleation hypothesis. Effects of droplet size, injection velocity and injection angle w...

This paper deals with peristaltic flow of a Johnson–Segalman fluid in an asymmetric channel under long-wavelength and lowReynolds number considerations. The channel asymmetry is caused due to the peristaltic wave train on the walls having different amplitudes and phase. A series solution for small Weissenberg number is obtained for the stream function, axial velocity, axial pressure gradient an...

Significant improvements are reported in the measurable velocity range and tissue motion artefact rejection of a phase-resolved optical coherence tomography and optical Doppler tomography system. Phase information derived from an in-phase and quadrature demodulator is used to estimate the mean blood flow velocity by the Kasai autocorrelation algorithm. A histogram-based velocity segmentation al...