scholarly journals Characterization of free jet expansion of SF6molecules

1987 ◽  
Vol 61 (7) ◽  
pp. 2674-2676 ◽  
Author(s):  
V. J. Trava‐Airoldi ◽  
Maria Esther Sbampato ◽  
Alberto M. dos Santos ◽  
C. C. Ghizoni
Keyword(s):  
Free Jet

Spectroscopy of metastable species in a free-jet expansion: the β ← A transition in IBr

1994 ◽  
Vol 72 (11-12) ◽  
pp. 1294-1306 ◽  
Author(s):  
Jason O. Clevenger ◽  
Quentin P. Ray ◽  
Joel Tellinghuisen ◽  
Xiaonan Zheng ◽  
Michael C. Heaven
Keyword(s):  
High Resolution ◽  
Laser Irradiation ◽  
Laser Excitation ◽  
Excitation Spectra ◽  
Detailed Characterization ◽  
Free Jet ◽  
X State ◽  
Π State ◽  
Existing Data

The A 1(3Π) state of IBr is observed in a free-jet expansion of IBr in Ar, following photolysis with ArF laser irradiation. Laser excitation spectra are obtained for the β 1(3P2) ← A transition in medium (0.5 cm−1) and high (0.08 cm−1) resolution. Sixteen ν′–ν″ bands recorded in high resolution are rotationally analyzed, providing the first detailed characterization of the lowest three νlevels in the A state. An additional ~50 bandheads in the ν″ = 0 and 1 progressions are recorded for both I79Br and I81Br. The new data, which sample ν′ levels in the range 31–71, are combined with existing information for low ν in the β state to provide improved constants for the β state. These results are merged with least-squares parameters from a detailed reanalysis of existing data for the A and X(1Σ+) states to yield spectroscopic parameters valid for ν = 0–20 in the X state and ν = 0–26 in the A state. Among these results are the first precise estimates of the equilibrium parameters in the A state: Te = 12 369.68 (14) cm−1, ωe = 134.22 (13) cm−1, Be = 0.042 40 (5) cm−1, Re = 2.8583 (16) Å.

Characterization of the Behavior of Confined Laminar Round Jets

2014 ◽  
Vol 137 (3) ◽  
Author(s):  
D. Tyler Landfried ◽  
Anirban Jana ◽  
Mark Kimber
Keyword(s):  
Stokes Equations ◽  
Reynolds Numbers ◽  
Diameter Ratio ◽  
Half Width ◽  
Navier Stokes ◽  
Centerline Velocity ◽  
Navier Stokes Equations ◽  
Free Jet ◽  
Round Jets

In this work, the Navier–Stokes equations are solved for a laminar, round jet in a large confinement. The flow is characterized as a function of the enclosure-to-jet diameter ratio, in the range 40–100, and the Reynolds numbers at jet inlet in the range 32–65. Results for jet decay and half width suggest that near the jet inlet the flow is identical to a free jet but eventually deviates away from the jet inlet. We develop a set of correlations including the jet centerline velocity and the jet half width, and features of the transition regions in the flow field.

Experimental Characterization of Air-Entrainment in a Plunging Water Jet System Using Particle Image Velocimetry (PIV)

2010 ◽  
Author(s):  
Xiaoliang Qu ◽  
Afshin Goharzadeh ◽  
Lyes Khezzar ◽  
Arman Molki
Keyword(s):  
Particle Image Velocimetry ◽  
Free Surface ◽  
Particle Image ◽  
Air Entrainment ◽  
Water Jet ◽  
Experimental Characterization ◽  
Free Jet ◽  
Image Velocimetry ◽  
Plunging Water Jet

This paper presents a detailed experimental study of a plunging jet on a free liquid surface. An experimental characterization facility is designed and constructed for generating a vertical round water jet impinging on a free surface of a pool. The experimental analysis focuses on the jet penetration depth, its relation to impact velocity Vj and free jet length Lj. Present results are compared with previous studies. The flowmap for four different regimes, in terms of impact jet velocity is obtained. The details of the two-dimensional velocity field below the pool liquid free surface under a no-entrainment regime, is obtained using Particle Image Velocimetry (PIV) and reveals the entrainment behavior of the impinging jet flow below the interface.

Time‐of‐flight characterization of pulsed supersonic helium free‐jet expansions

1986 ◽  
Vol 57 (9) ◽  
pp. 2266-2273 ◽  
Author(s):  
Bruce D. Kay ◽  
T. D. Raymond ◽  
J. K. Rice
Keyword(s):  
Time Of Flight ◽  
Free Jet

Characterization of jets for impulsively-started needle-free jet injectors: Influence of fluid properties

2019 ◽  
Vol 53 ◽  
pp. 101167 ◽  
Author(s):  
Pankaj Rohilla ◽  
Yatish S. Rane ◽  
Idera Lawal ◽  
Andrew Le Blanc ◽  
Justin Davis ◽  
...  
Keyword(s):  
Free Jet ◽  
Fluid Properties ◽  
Jet Injectors

Characterization of an ethylene free jet

1989 ◽  
Vol 49 (1) ◽  
pp. 39-47 ◽  
Author(s):  
N. Dam ◽  
J. Reuss
Keyword(s):  
Free Jet

Production and characterization of temperature-controlled free radicals in a free jet expansion

1981 ◽  
Vol 84 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Michael Heaven ◽  
Terry A. Miller ◽  
V.E. Bondybey
Keyword(s):  
Free Radicals ◽  
Free Jet ◽  
Temperature Controlled

scholarly journals Numerical Investigation of Nozzle Jet Flow in a Pelton Microturbine

Machines ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 158
Author(s):  
Dorian Nedelcu ◽  
Vasile Cojocaru ◽  
Raoul-Cristian Avasiloaie
Keyword(s):  
Flow Rate ◽  
Jet Flow ◽  
Energy Performance ◽  
Nozzle Diameter ◽  
Resultant Force ◽  
Rate Variation ◽  
Outlet Section ◽  
Free Jet ◽  
Turbine Efficiency

The characterization of flow through Pelton hydro turbines allows the optimization of their operation and maximization of energy performance. The flow in the injector of Pelton turbines and in the free jet area (the area from the injector outlet surface to the runner bucket inlet surface) is influenced by several parameters: the geometry of injector components (nozzle and injector spear), the injector opening, and the turbine head. The parameters of the free jet flow (velocity distribution, pressure distribution, and jet spread) are reflected in the turbine efficiency. The research presented in this paper focuses on the numerical characterization of flow in the injector and the free jet of a Pelton microturbine. Three injector geometries were considered, with different nozzle diameters: 13.3 mm, 14.4 mm, and 16.3 mm. For each of these geometries, the flow was analyzed for five values of turbine head (H = 15 m, H = 20 m, H = 25 m, H = 30 m, H = 35 m) and six values of injector opening (S = 3 mm, S = 6 mm, S = 9 mm, S = 12 mm, S = 15 mm, S = 18 mm). The results of numerical simulations were used to plot injector flow-rate characteristics and injector force characteristics (the resultant force on the injector spear and the resultant force on the injector nozzle). The highest influence on the flow rate variation is given by the variation of turbine head, followed by the variation of the injector opening and the variation of the nozzle diameter. Increasing the nozzle diameter accentuates the variation of the flow rate versus the turbine head. The variation of axial velocity and pressure in the free jet is presented for four sections parallel to the outlet section of the injector. The injector openings that generate the highest values of velocity/pressure on the runner inlet surface are highlighted. The results allow optimization of functional parameters for increasing turbine efficiency and optimizing the design process of Pelton microturbines.

Morphological Characterization of Mycobacteriophage R1

1974 ◽  
Vol 32 ◽  
pp. 254-255
Author(s):  
B. L. Soloff ◽  
T. A. Rado
Keyword(s):  
Carbon Source ◽  
Stationary Phase ◽  
Growth Phase ◽  
Minimal Medium ◽  
Morphological Characterization ◽  
Logarithmic Growth Phase ◽  
Complete Lysis ◽  
Lysogenic Culture ◽  
Logarithmic Growth

Mycobacteriophage R1 was originally isolated from a lysogenic culture of M. butyricum. The virus was propagated on a leucine-requiring derivative of M. smegmatis, 607 leu−, isolated by nitrosoguanidine mutagenesis of typestrain ATCC 607. Growth was accomplished in a minimal medium containing glycerol and glucose as carbon source and enriched by the addition of 80 μg/ ml L-leucine. Bacteria in early logarithmic growth phase were infected with virus at a multiplicity of 5, and incubated with aeration for 8 hours. The partially lysed suspension was diluted 1:10 in growth medium and incubated for a further 8 hours. This permitted stationary phase cells to re-enter logarithmic growth and resulted in complete lysis of the culture.

Sign in / Sign up

Export Citation Format

Share Document