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Research Papers: Fundamental Issues and Canonical Flows

Ejecta Production and Transport From a Shocked Sn Coupon

[+] Author and Article Information
Y. Liu

Mem. ASME
Research Scientist
Department of Design Physics,
AWE plc,
Reading RG7 4PR, UK
e-mail: yi.liu@awe.co.uk; engs0226@googlemail.com

B. Grieves

Research Scientist
Department of Design Physics,
AWE plc,
Reading RG7 4PR, UK
e-mail: brian.grieves@awe.co.uk

1Corresponding author.

Published with the permission of the controller of Her Britannic Majesty's Stationery Office. Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received January 23, 2013; final manuscript received December 29, 2013; published online July 9, 2014. Assoc. Editor: Oleg Schilling.

J. Fluids Eng 136(9), 091202 (Jul 09, 2014) (9 pages) Paper No: FE-13-1047; doi: 10.1115/1.4026513 History: Received January 23, 2013; Revised December 29, 2013

When a shock interacts with a Sn coupon, micrometer-scale particulate fragments, called ejecta, are usually formed and emitted from its free surface. Understanding the characteristics of such ejecta is of great importance in many fields. The velocity distribution and amount of particulate mass are directly dependent on several physical properties of the shock wave and shocked material states. In this paper, we numerically interrogate ejecta production and its dynamics for a wide range of shock loading conditions in a supported wave form and quantify the correlation of ejecta source with shock strength as well as surface roughness, which is represented by randomly perturbed surfaces and the one with a macrofeature superimposed. Furthermore, an unsteadiness-aware drag coefficient is discussed and implemented to accomplish ejecta transport studies.

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Figures

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Fig. 2

The representative of the wave pattern (x-t) in the Sn coupon and vacuum upon a shock loading of 0.26 Mbars impact

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Fig. 1

Schematics of the computational domain, boundary conditions, and a representative roughness at the free surface

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Fig. 3

The density evolution upon a shock loading of 0.26 Mbars impact on a Sn coupon of the R45 surface, times from 0.051 μs to 0.08 μs, (the color table from yellow to red representing from lower to higher densities)

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Fig. 4

The cumulative areal density profiles of the R45 surface upon a shock loading of 0.26 Mbars impact

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Fig. 12

The particle trajectories in a vacuum environment for the velocity of interest

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Fig. 13

The particle trajectories in a dense gas for the velocity of interest

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Fig. 10

The density of Sn and gas flow field

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Fig. 5

The melt fraction evolution upon a shock loading of 0.26 Mbars impact on a Sn coupon of the R45 surface (the color table from blue to red represents the transition from solid to liquid phase)

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Fig. 6

The R4 cumulative areal density profiles upon a shock loading of 0.26 Mbars impact

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Fig. 7

The R5 cumulative areal density profiles upon a shock loading of 0.26 Mbars impact

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Fig. 11

The particle trajectories for the size of interest

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Fig. 8

The density evolution upon a shock loading of 0.26 Mbars impact

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Fig. 9

The Δ90R45 dynamic areal density profiles upon a shock loading of 0.26 Mbars impact

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