Role of Fiber Optics in Ultra-High-Speed Photography

1962 ◽  
Vol 71 (2) ◽  
pp. 75-81 ◽  
Author(s):  
N. S. Kapany
Keyword(s):  
Fiber Optics ◽  
High Speed ◽  
High Speed Photography ◽  
Ultra High Speed

Analysis of Droplet Impacting on Inclined Wall

2020 ◽  
Author(s):  
Bowen Chen ◽  
Bo Wang ◽  
Bingzheng Ke ◽  
Ru Li ◽  
Ruifeng Tian
Keyword(s):  
Steam Generator ◽  
High Speed ◽  
Nuclear Power ◽  
Separation Efficiency ◽  
Inertial Force ◽  
High Speed Photography ◽  
Separation Mechanism ◽  
The Relationship ◽  
Plate Separator

Abstract The steam generator is an important part of the nuclear power plant, and the corrugated plate separator plays the important role of drying steam in the steam generator to improve power generation efficiency and protect the safety of the system. The separation mechanism of the corrugated plate separator is relatively complicated. The droplets are moved by the drag force of the steam and gravity in the corrugated plate separator, and captured by the wall of the corrugated plate separator. When the velocity is increased, the inertial force of droplet is increased, so that the droplet is more easily captured by the wall of the corrugated plate separator, and the separation efficiency of the corrugated plate separator is increased. In this paper, the phenomenon of droplet impact on the inclined wall is studied by high-speed photography technology, and the cause and mechanism of the phenomenon are analyzed. By analyzing the spreading and splashing on the droplets impacting on the inclined wall, the relationship between the inclination angle of the droplet impacting on the inclined wall and the spreading is obtained, and the influence of droplets with different Weber numbers, and dry and wetted walls were analyzed, which provide a basis for the optimization of the corrugated plate separator.

scholarly journals Flash! Seeing the Unseen by Ultra-High Speed Photography

1942 ◽  
Vol 32 (5) ◽  
pp. 596
Author(s):  
Paul V. Trovillo ◽  
Harold E. Edgerton ◽  
James R. Killian
Keyword(s):  
High Speed ◽  
High Speed Photography ◽  
Ultra High Speed

Capacitor Discharge Weld Modelling Using Ultra High Speed Photography

1993 ◽  
Vol 314 ◽  
Author(s):  
R. D. Wilson ◽  
J. A. Hawk ◽  
J. H. Devletian
Keyword(s):  
High Speed ◽  
Welding Process ◽  
Travel Speed ◽  
Analytical Models ◽  
High Speed Photography ◽  
Welding Time ◽  
Capacitor Discharge ◽  
Ultra High Speed ◽  
High Cooling Rates ◽  
Weld Area

AbstractCapacitor discharge welding (CDW) is a rapid solidification joining process where high cooling rates (106 K/s) are obtained as a result of the large weld surface area to small weld volume. The objective of this study, directed by the U.S. Bureau of Mines and the Oregon Graduate Institute of Science and Technology, was to use ultra-high speed photography to quantify transient arc behavior during the CDW cycle. The simple cylindrical geometries of the CD welds have been used to formulate analytical models which are compared to the high speed photographs of the welding process. The high speed photographs were analyzed with respect to welding time and process weld variables and compared to predicted values from the analytical model. The detailed photographic analyses revealed that material is continuously ejected as a plasma from the weld area due to induced magnetic forces, rather than having the liquid metal squeezed out of the weld upon contact. It was found that welding time was controlled by tip length and drop height. Results from high speed photographs found the arc travel speed around tube welds to be 109m/s. Finally, the high speed photographs revealed that the velocity of arc propagation during ignition was fast enough to allow the CDW process to be modelled as onedimensional heat flow.

Air spark fiducial for ultra‐high‐speed photography

1973 ◽  
Vol 44 (11) ◽  
pp. 1630-1632 ◽  
Author(s):  
H. M. Graham ◽  
G. A. Leavitt
Keyword(s):  
High Speed ◽  
High Speed Photography ◽  
Ultra High Speed

Evaluation of Characteristics of Transonic Interfacial Fracture Phenomena Using Ultra-high Speed Photography

2000 ◽  
Vol 2000 (0) ◽  
pp. 229-230
Author(s):  
Toshihisa NISHIOKA ◽  
Hidemi MIYAUCHI ◽  
Takehiro FUJIMOTO ◽  
Keigo SAKAKURA
Keyword(s):  
High Speed ◽  
Interfacial Fracture ◽  
High Speed Photography ◽  
Ultra High Speed
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