Study of Large-Scale Vapor Explosions in Interaction of Fusible Metals with Water

2001 ◽  
Vol 32 (7-8) ◽  
pp. 7
Author(s):  
G. A. Kapinos ◽  
Yu. P. Meleshko ◽  
V. I. Nalivaev ◽  
O. V. Remizov ◽  
S. R. Kharitonov
Keyword(s):  
Large Scale ◽  
Vapor Explosions

Nucleation Processes in Large Scale Vapor Explosions

1979 ◽  
Vol 101 (2) ◽  
pp. 280-287 ◽  
Author(s):  
R. E. Henry ◽  
H. K. Fauske
Keyword(s):  
Large Scale ◽  
Interface Temperature ◽  
Liquid Droplets ◽  
Contact Interface ◽  
Vapor Cavity ◽  
Spontaneous Nucleation ◽  
System Pressure ◽  
Nucleation Model ◽  
Vapor Explosions ◽  
Cold Liquid

A spontaneous nucleation model is proposed for the mechanisms which lead to explosive boiling in the free contacting mode. The model considers that spontaneous nucleation cannot occur until the thermal boundary layer is sufficiently thick to support a critical size vapor cavity, and that significant bubble growth requires an established pressure gradient in the cold liquid. This results in a prediction that, for an interface temperature above the spontaneous nucleation limit, large cold liquid droplets will remain in film boiling due to coalescence of vapor nuclei, whereas smaller droplets will be captured by the hot liquid surface and rapidly vaporize, which agrees with the experimental observations. The model also predicts that explosions are eliminated by an elevated system pressure or a supercritical contact interface temperature, and this is also in agreement with experimental data.

Vapor Explosions: Modeling and Experimental Analysis in Both Small- and Large-Scale Setups: A Review

JOM ◽  
2021 ◽  
Author(s):  
Arne Simons ◽  
Inge Bellemans ◽  
Tijl Crivits ◽  
Kim Verbeken
Keyword(s):  
Experimental Analysis ◽  
Large Scale ◽  
Vapor Explosions

Two-Phase Description of Hydrodynamic Fragmentation Processes Within Thermal Detonation Waves

1984 ◽  
Vol 106 (4) ◽  
pp. 728-734 ◽  
Author(s):  
M. Bu¨rger ◽  
D. S. Kim ◽  
W. Schwalbe ◽  
H. Unger ◽  
H. Hohmann ◽  
...  
Keyword(s):  
Large Scale ◽  
Flow Model ◽  
Salt Water ◽  
Capillary Waves ◽  
Detonation Waves ◽  
Two Phase ◽  
Fragmentation Behavior ◽  
Vapor Explosions ◽  
Fragmentation Processes ◽  
Hydrodynamic Fragmentation

Large-scale vapor explosions are described by thermal detonation waves, proceeding through a fuel-coolant mixture. A two-phase flow model is used for modeling the processes inside a wave. One phase is formed by the drops of melt and the other by the coolant and the fragments. For the interfacial transfer relations between the phases new descriptions are presented, which extend earlier thermal detonation models. The fragmentation behavior can be calculated from two different models, one based on deformation breakup and Taylor instability and another describing fragmentation by stripping of capillary waves induced by shear flow instabilities. In addition to the time development of the fragmented mass, the models give also the actual sizes of the fragments. Results of the fragmentation models are compared with the experiments on hydrodynamic fragmentation of single drops of gallium in water flows. For vapor explosion experiments with tin-water and salt-water systems the detonation cases are determined using the wave stripping model.

Unit Sphere Concept for Macroscopic Triggering of Large-scale Vapor Explosions

2002 ◽  
Vol 39 (8) ◽  
pp. 854-864 ◽  
Author(s):  
Yu MARUYAMA ◽  
Kiyofumi MORIYAMA ◽  
Hideo NAKAMURA
Keyword(s):  
Unit Sphere ◽  
Large Scale ◽  
Vapor Explosions

scholarly journals The Role of Fragmentation Mechanism in Large-Scale Vapor Explosions

2004 ◽  
Vol 47 (2) ◽  
pp. 268-276
Author(s):  
Jie LIU ◽  
Seiichi KOSHIZUKA ◽  
Yoshiaki OKA
Keyword(s):  
Large Scale ◽  
Fragmentation Mechanism ◽  
Vapor Explosions

A Propagation/Expansion Model for Large Scale Vapor Explosions

1987 ◽  
Vol 95 (3) ◽  
pp. 225-240 ◽  
Author(s):  
M. D. Oh ◽  
M. L. Corradini
Keyword(s):  
Large Scale ◽  
Vapor Explosions ◽  
Expansion Model

Some comments about observations and image processing of comet 29P/Schwassmann-Wachmann 1

1999 ◽  
Vol 173 ◽  
pp. 243-248
Author(s):  
D. Kubáček ◽  
A. Galád ◽  
A. Pravda
Keyword(s):  
Image Processing ◽  
Large Scale ◽  
Harvard College ◽  
Oak Ridge ◽  
Large Scale Structures ◽  
Short Period Comet ◽  
Short Period ◽  
Scale Structures ◽  
Harvard College Observatory ◽  
Period Comet

AbstractUnusual short-period comet 29P/Schwassmann-Wachmann 1 inspired many observers to explain its unpredictable outbursts. In this paper large scale structures and features from the inner part of the coma in time periods around outbursts are studied. CCD images were taken at Whipple Observatory, Mt. Hopkins, in 1989 and at Astronomical Observatory, Modra, from 1995 to 1998. Photographic plates of the comet were taken at Harvard College Observatory, Oak Ridge, from 1974 to 1982. The latter were digitized at first to apply the same techniques of image processing for optimizing the visibility of features in the coma during outbursts. Outbursts and coma structures show various shapes.

Evolution of Large-Scale Coronal Structures

1994 ◽  
Vol 144 ◽  
pp. 29-33
Author(s):  
P. Ambrož
Keyword(s):  
Magnetic Field ◽  
Field Line ◽  
Large Scale ◽  
Coronal Magnetic Field ◽  
Source Surface ◽  
Solar Cycles ◽  
Characteristic Relationship ◽  
The Magnetic Field ◽  
Coronal Structures

AbstractThe large-scale coronal structures observed during the sporadically visible solar eclipses were compared with the numerically extrapolated field-line structures of coronal magnetic field. A characteristic relationship between the observed structures of coronal plasma and the magnetic field line configurations was determined. The long-term evolution of large scale coronal structures inferred from photospheric magnetic observations in the course of 11- and 22-year solar cycles is described.Some known parameters, such as the source surface radius, or coronal rotation rate are discussed and actually interpreted. A relation between the large-scale photospheric magnetic field evolution and the coronal structure rearrangement is demonstrated.

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