Role of Fiber Optics in Ultra-High-Speed Photography

1962 ◽  
Vol 71 (2) ◽  
pp. 75-81 ◽  
Author(s):  
N. S. Kapany
Author(s):  
Bowen Chen ◽  
Bo Wang ◽  
Bingzheng Ke ◽  
Ru Li ◽  
Ruifeng Tian

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.


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

1993 ◽  
Vol 314 ◽  
Author(s):  
R. D. Wilson ◽  
J. A. Hawk ◽  
J. H. Devletian

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.


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

2000 ◽  
Vol 2000 (0) ◽  
pp. 229-230
Author(s):  
Toshihisa NISHIOKA ◽  
Hidemi MIYAUCHI ◽  
Takehiro FUJIMOTO ◽  
Keigo SAKAKURA

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