The physical parameters of jets are still poorly understood. Here we present long slit spectra of the molecular hydrogen emission from the jet powered by the young stellar object in L483, from which we obtain details of the jet structure and shock velocities. The jet has a knotty structure, and, in addition, weaker emission is seen between the knots, so that emission is observed along the full ...

Introduction: Accurate quantitation of the peak arterial jet velocity is crucial in assessing the severity of cardiovascular disease. The current “gold standard”, Doppler ultrasound, is highly sensitive to beam position and Doppler angle. Fourier velocity encoding (FVE) resolves the full velocity spectrum [1], but conventional gated methods [2-4] do not work well during arrhythmia and require l...

OBJECTIVE To study the prevalence and the characteristics of physiological valve regurgitation. DESIGN Pulsed wave Doppler echocardiography, continuous wave Doppler echocardiography and Doppler colour flow mapping were performed prospectively in healthy volunteers. SETTING Echocardiography laboratory in a city hospital. PATIENTS 32 consecutive healthy volunteers (age 21-49 years, mean age...

wall-jet flow is an important flow field in hydraulic engineering, and its applications include flow from the bottom outlet of dams and sluice gates. in this paper, the plane turbulent wall jet in shallow tailwater is simulated by solving the reynolds averaged navier-stokes equations using the standard  turbulence closure model. this study aims to explore the ability of a time splitting method ...

The interaction of a laser-induced cavitation bubble with an elastic boundary is investigated experimentally by high-speed photography and acoustic measurements. The elastic material consists of a polyacrylamide (PAA) gel whose elastic properties can be controlled by modifying the water content of the sample. The elastic modulus, E, is varied between 0.017 MPa and 2.03 MPa, and the dimensionles...

The flowfield of a round synthetic jet driven by a piezoelectric membrane issuing into a quiescent environment is studied in this paper. The self-similar behavior exhibited by both synthetic and continuous turbulent jets leads to the hypothesis that synthetic jetsmay bemodeled using similarity analysis, just as continuous turbulent jets aremodeled. Accordingly, synthetic jets are modeled using ...

We present a complete SiO v = 0 J = 2 → 1 synthesis image of the red-shifted outflow lobe from the Class 0 protostar L 1448-mm. The image is a 5-field mosaic obtained with the IRAM interferometer at ∼3′′ angular resolution. The SiO emission arises in a highly-collimated jet extending over 0.2 pc. The jet consists of fourmain blobs, probably corresponding to successive episodes of mass-loss from...

In the present paper the characterization of the flow field generated by means of a submerged gaseous jet exited by means of a coaxial synthetic jet has been investigated. The purpose of this investigation is to infer the aerodynamic interaction of the two fluid structures that play an interesting role in several industrial applications like jet actuator, flame stability in the combustor for mi...

To show the effects of the particles and forced disturbances on the instantaneous large-scale vortex structures in a gas-particle round jet, coherent structures in gas-particle turbulent round jets were investigated experimentally by flow visualization. The 45m and 350m diameter glass beads were used as the particles in the experiments. An acoustic speaker was used to introduce velocity perturb...

Experiments were performed to investigate single-phase heat transfer from a smooth 12.1'x 12.7 mm simulated chip to a two-dimensional jet of dielectric Fluorinert FC-72 liquid issuing from a thin rectangular slot into a channel confined between the chip surface and nozzle plate. The effects of jet width, confinement channel height, and impingement velocity have been examined. Channel height had...