Atherosclerotic plaques are found in regions exposed to disturbed flow, suggesting the active participation of the hemodynamic environment in atherogenesis. Indeed, unidirectional and oscillatory flow patterns (ie, bidirectional) have been shown to induce contrasting effects on endothelial function. The purpose of the present study was to evaluate the effect of these 2 flow patterns characteriz...

We present an approach based on computer vision and machine learning methods to identify two-phase flow with complex patterns in oscillatory conditions. A visualization experiment bench was designed, constructed, used simulate the actual reciprocating motion of cooling gallery inside piston low-speed diesel engines. The results our proposed show that feature vectors extracted from optical image...

BACKGROUND The forced oscillation technique (FOT) is a simple method for assessing the oscillatory mechanics of the respiratory system. The oscillatory properties, respiratory system resistance (Rrs) and reactance (Xrs), are calculated from the oscillatory pressure/flow relationship. Although the FOT has been a well-established technique, some detailed experimental conditions would be different...

Stella, M. H., and S. J. England. Laryngeal muscle response to phasic and tonic upper airway pressure and flow. J Appl Physiol 91: 905–911, 2001.— The hypothesis that respiratory modulation due to upper airway (UA) pressure and flow is dependent on stimulus modality and respiratory phase-specific activation was assessed in anesthetized, tracheotomized, spontaneously breathing piglets. Negative ...

Abstract. The Benjamin-Feir instability describes the instability of a uniform oscillatory wave train in an irrotational flow subject to small perturbation of wave number, amplitude and frequency. Their instability analysis is based on the perturbation around the second order Stokes wave which satisfies the dynamic and kinematic free-surface boundary conditions up to the second order. In the sa...

We revisit Taylor dispersion in oscillatory flows at zero Reynolds number, giving an alternative method of calculating the Taylor dispersivity that is easier to use with computer algebra packages to obtain exact expressions. We consider the effect of out-of-phase oscillatory shear and Poiseuille flow, and show that the resulting Taylor dispersivity is independent of the phase difference. We als...

The aim of this work is to characterize the boundary layer over small appendages in insects in longitudinal and transverse oscillatory flows. The problem of immediate interest is the early warning system in crickets perceiving flying predators using air-flow-sensitive hairs on cerci, two long appendages at their rear. We studied both types of oscillatory flows around small cylinders using strob...

A simple exact solution of the Boussinesq equations of motion, thermal energy, and mass conservation is obtained for an oscillatory flow regime in a stably stratified rotating fluid. The flow is unbounded and characterized by velocity gradients that vary with time but are spatially uniform—the basic state of Craik-Criminale flows. The solution describes an oscillatory convergent-divergent flow ...

[1] This paper reports the findings of a 2week field campaign designed to study wave-induced flows within a meadow of Posidonia oceanica at water depth 9m. Previous laboratory experiments suggest that waves induce a mean mass drift in the direction of wave propagation (“streaming”) through submerged canopies of vegetation. This paper provides the first field measurements of this wave-induced st...