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Research Papers: Flows in Complex Systems

Numerical Analysis of the Iridescent Ring Around Cavitation Erosion Pit on Stainless Steel Surface

[+] Author and Article Information
Fu Mengru

Ocean College,
Zhejiang University,
Hangzhou 310058, China
e-mail: fumengru@zju.edu.cn

Ge Han

Ocean College,
Zhejiang University,
Hangzhou 310058, China
e-mail: gehan@zju.edu.cn

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received March 25, 2015; final manuscript received March 11, 2016; published online May 25, 2016. Assoc. Editor: Olivier Coutier-Delgosha.

J. Fluids Eng 138(9), 091101 (May 25, 2016) (6 pages) Paper No: FE-15-1204; doi: 10.1115/1.4033294 History: Received March 25, 2015; Revised March 11, 2016

In ultrasonic cavitation, iridescent rings always occur around erosion pits on steel surface. These colorful halos can reflect the experienced temperature of the steel surface, but the reason for their formation is controversial. In this study, the development of an erosion pit and the iridescent ring around it on stainless steel (1Cr18Ni9Ti) surface was numerically investigated based on the energy transformation theory. The results revealed that the experienced temperature of ring areas with the shape of three-dimensional hemisphere could reach as high as 1685 K, and the position of material's highest temperature was exactly at the position of stress concentration.

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Figures

Grahic Jump Location
Fig. 4

Strike of microjet with round head on solid surface

Grahic Jump Location
Fig. 3

(a) Load pressure versus maximum temperature in the material and displacement of surface central point O from 0 ns to 50 ns; (b) temperature distribution around the erosion pit in the perpendicular direction at the time of 13 ns; (c) temperature distribution of the area marked with dashed lines in (b), continuous curve is the cross section of the erosion pit, and the dotted circle is the position of highest temperature in material; and (d) the von Mises stress distribution of the same area in (c), the dotted circle is the position of stress concentration

Grahic Jump Location
Fig. 2

(a) Surface profiles of erosion pit and iridescent ring at the time of 13 ns; dpit, hpit, hrim, and drim are the pit diameter, pit depth, hump height, and length, respectively, and (b) temperature distribution of the iridescent ring

Grahic Jump Location
Fig. 1

(a) Schematic diagram for the strike of a microjet and the load area, (b) detail view of load area; the load area has been divided into five sections, P1P5 and the interval between each section is 1 μm, (c) geometry of model, and (d) load curves of P1P5

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