Initial Free Surface Instabilities on a High-Speed Water Jet Simulating a Liquid-Metal Target

1999 ◽  
Vol 36 (1) ◽  
pp. 69-84 ◽  
Author(s):  
Kazuhiro Itoh ◽  
Yoshiyuki Tsuji ◽  
Hideo Nakamura ◽  
Yutaka Kukita
Keyword(s):  
Free Surface ◽  
Liquid Metal ◽  
High Speed ◽  
Water Jet ◽  
Metal Target

scholarly journals Evaluation of Streamwise Waveform on a High-Speed Water Jet by Detecting Trajectories of Two Refracted Laser Beams

2011 ◽  
Vol 2011 ◽  
pp. 1-12
Author(s):  
Kazuhiro Itoh ◽  
Yasuo Iwata ◽  
Hiroshige Kumamaru ◽  
Yuji Shimogonya
Keyword(s):  
Free Surface ◽  
High Speed ◽  
Time Series Data ◽  
Slope Angle ◽  
Correlation Method ◽  
Water Jet ◽  
Laser Beams ◽  
Series Data ◽  
Angle Data ◽  
Surface Fluctuations

Free surface fluctuations on a high-speed water jet were measured by a laser beam refraction technique. This method can be used to obtain quantitative time-series data on local surface fluctuations. The developed system employs two pulsed laser diodes, and it uses a high-speed optical sensor to detect the instantaneous positions of the laser beams that are refracted at the free surface. Fluctuations in the slope angle are measured at two locations separated by 1.27 mm. The wave speed of each free surface wave, which is determined by the zero-upcrossing method, is experimentally evaluated by the cross-correlation method. A two-dimensional waveform is obtained by integrating the slope angle data. The local mean wavelength and mean wave steepness are evaluated for average jet velocities up to  m/s. Streamwise waveforms of the high-speed water jet at several locations exhibit appreciable asymmetry and have steep profiles.

Radiated Sound of a High-Speed Water-Jet-Propelled Transportation Vessel

2016 ◽  
pp. 951-956
Author(s):  
Alexis B. Rudd ◽  
Michael F. Richlen ◽  
Alison K. Stimpert ◽  
Whitlow W. L. Au
Keyword(s):  
High Speed ◽  
Water Jet ◽  
Radiated Sound

Experimental Investigation of Boundary Layer Instabilities on the Free Surface of Non-Turbulent Jet

2012 ◽  
Author(s):  
Matthieu A. Andre ◽  
Philippe M. Bardet
Keyword(s):  
Boundary Layer ◽  
Free Surface ◽  
High Speed ◽  
Particle Tracking Velocimetry ◽  
Capillary Waves ◽  
Wave Growth ◽  
Image Velocimetry ◽  
Planar Laser ◽  
Surface Visualization ◽  
The Waves

Shear instabilities induced by the relaxation of laminar boundary layer at the free surface of a high speed liquid jet are investigated experimentally. Physical insights into these instabilities and the resulting capillary wave growth are gained by performing non-intrusive measurements of flow structure in the direct vicinity of the surface. The experimental results are a combination of surface visualization, planar laser induced fluorescence (PLIF), particle image velocimetry (PIV), and particle tracking velocimetry (PTV). They suggest that 2D spanwise vortices in the shear layer play a major role in these instabilities by triggering 2D waves on the free surface as predicted by linear stability analysis. These vortices, however, are found to travel at a different speed than the capillary waves they initially created resulting in interference with the waves and wave growth. A new experimental facility was built; it consists of a 20.3 × 146.mm rectangular water wall jet with Reynolds number based on channel depth between 3.13 × 104 to 1.65 × 105 and 115. to 264. based on boundary layer momentum thickness.

High-speed singulation of electronic packages using a frequency-doubled Nd:YAG laser in a water jet and realization of a 200-W green laser

2003 ◽  
Author(s):  
Frank R. Wagner ◽  
Wentao Hu ◽  
Akos Spiegel ◽  
Nandor Vago ◽  
Bernold Richerzhagen
Keyword(s):  
Nd:Yag Laser ◽  
High Speed ◽  
Green Laser ◽  
Water Jet ◽  
Electronic Packages

Dieless Water Jet Incremental Micro-Forming

2018 ◽  
Author(s):  
Yi Shi ◽  
Jian Cao ◽  
Kornel F. Ehmann
Keyword(s):  
Process Parameters ◽  
Thin Shell ◽  
High Speed ◽  
Single Point ◽  
Sheet Thickness ◽  
Water Jet ◽  
Micro Forming ◽  
Forming Process ◽  
Thin Foils ◽  
High Pressure Water Jet

Compared to the conventional single-point incremental forming (SPIF) processes, water jet incremental micro-forming (WJIMF) utilizes a high-speed and high-pressure water jet as a tool instead of a rigid round-tipped tool to fabricate thin shell micro objects. Thin foils were incrementally formed with micro-scale water jets on a specially designed testbed. In this paper, the effects on the water jet incremental micro-forming process with respect to several key process parameters, including water jet pressure, relative water jet diameter, sheet thickness, and feed rate, were experimentally studied using stainless steel foils. Experimental results indicate that feature geometry, especially depth, can be controlled by adjusting the processes parameters. The presented results and conclusions provide a foundation for future modeling work and the selection of process parameters to achieve high quality thin shell micro products.

Validation of NEPTUNE_CFD Module with Data of a Plunging Water Jet Entering a Free Surface

2009 ◽  
Vol 167 (1) ◽  
pp. 60-70 ◽  
Author(s):  
M. C. Galassi ◽  
D. Bestion ◽  
C. Morel ◽  
J. Pouvreau ◽  
F. D’Auria
Keyword(s):  
Free Surface ◽  
Water Jet ◽  
Plunging Water Jet

Hydrodynamic characteristics of an experimental model of the target in the MK-1 liquid-metal target system

Atomic Energy ◽  
2006 ◽  
Vol 101 (3) ◽  
pp. 636-643
Author(s):  
A. A. Boronin ◽  
A. D. Efanov ◽  
Yu. D. Levchenko ◽  
Yu. I. Orlov ◽  
V. S. Fedotovskii
Keyword(s):  
Liquid Metal ◽  
Experimental Model ◽  
Target System ◽  
Hydrodynamic Characteristics ◽  
Metal Target
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