This work investigates the ability of Coanda jet blowing to modify the base pressure of a cylindrical body aligned axially in a flow, and thereby, produce overall drag reduction. It is found that blowing through one or two slot jets concentric to the outer body circumference can significantly influence the entire base flow region. The recirculating wake is eliminated and is replaced by freestre...

The current work experimentally investigates the flow characteristics of an air jet impinging on an open rotor-stator system with a low non-dimensional spacing, G = 0.02, and with a very low aspect ratio, e/D = 0.25. The rotational Reynolds numbers varied from 0.33 × 10 to 5.32 × 10, while the jet Reynolds numbers ranged from 17.2×10 to 43×10. Particle image velocimetry (PIV) measurements were ...

We find that a liquid jet can bounce off a bath of the same liquid if the bath is moving horizontally with respect to the jet. Previous observations of jets rebounding off a bath (e.g., the Kaye effect) have been reported only for non-Newtonian fluids, while we observe bouncing jets in a variety of Newtonian fluids, including mineral oil poured by hand. A thin layer of air separates the bouncin...

The noninvasive Doppler assessment of regurgitant volume from jet size is limited by the fundamental inequality of jet volume and regurgitant volume and by the dependence of jet dimensions on driving pressure and instrument settings for a given flow volume. Therefore, this study addresses the hypothesis that an equation could be derived from basic physical principles to quantify regurgitant vol...

RATIONALE Steady-state mild pulmonary hypertension is a risk factor for death in adults with sickle cell disease. Acute pulmonary hypertension has been reported during exercise and vasoocclusive pain crisis in these patients. OBJECTIVES The aim of the present study was to evaluate changes in pulmonary pressures and cardiac biomarkers during severe acute chest syndrome and their associations w...

Direct numerical simulation (DNS) and dynamic mode decomposition (DMD) are used to study the shear layer characteristics of a jet in a crossflow. Experimental observations by Megerian et al. (J. Fluid Mech., vol. 593, 2007, pp. 93–129) at velocity ratios (R = vj/u∞) of 2 and 4 and Reynolds number (Re = vjD/ν) of 2000 on the transition from absolute to convective instability of the upstream shea...

Shaped-charge penetration of explosives is studied analytically and experimentally. Two models are developed, each applicable to a different regime of jet velocity. The first addresses high-velocity penetration. If a jet is sufficiently fast, its penetration velocity will exceed the explosive's detonation velocity, and the process may achieve a steady state with the crater following the detonat...

Herbig-Haro flows discovered in photoionized medium forms a separate category and detailed studies of which become one of the key issues to our understanding of jet production and evolution. The Rosette HH2 jet is the second of such flows that immersed in the spectacular HII region of the Rosette Nebula. However, its disconnected jet components are detached from the proposed energy source, have...

Instantaneous, two-dimensional velocity measurements were conducted in the axial plane of a selfsimilar turbulent axisymmetric jet. The velocity fields were high-pass filtered to expose the vortical structures. An automated method was used to identify the radial and axial coordinates of the vortex centers and rotational sense, and to measure their size, circulation, vorticity, and energy. New i...

In this work, fluid dynamics of a turbulent round impinging jet has been studied using Computational Fluid Dynamics (CFD) and the results have been compared with experimental data from the literature. The fluid was water with density of 1000 kg/m 3 and the average velocity of the submerged jet was kept constant at 10.7 m/s while the liquid viscosity varied from 1 cP to 100 cP. Different turbule...