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Research Papers: Applications

The Effect of Acoustic Streaming on the Ring Area Around the Cavitation Erosion Pit

[+] Author and Article Information
Dayun Yan

State Key Laboratory of Tribology,
Tsinghua University,
Beijing 100084, China

Jiadao Wang

State Key Laboratory of Tribology,
Tsinghua University,
Beijing 100084, China
e-mail: jdwang@mail.tsinghua.edu.cn

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received October 14, 2013; final manuscript received December 13, 2013; published online January 20, 2014. Assoc. Editor: George K. Nikas.

J. Tribol 136(2), 021102 (Jan 20, 2014) (5 pages) Paper No: TRIB-13-1217; doi: 10.1115/1.4026348 History: Received October 14, 2013; Revised December 13, 2013

The formation of a ring area around the cavitation erosion pit on carbon steel is due to the cavitation erosion–corrosion. For the ultrasonic irradiation in water, both the ultrasonic cavitation and the acoustic streaming are generated. Due to the oscillation of the horn, the acoustic streaming flows from the tip of the horn to the bulk water. So far, the acoustic streaming has not been considered in previous studies on the ultrasonic cavitation erosion–corrosion. This study first reveals that the acoustic streaming noticeably affects the evolution of the nascent ring area. The mean velocity of acoustic streaming is inversely proportional to the gap (H) between the tip of the horn and the surface of the specimen. When H is 65 mm and 40 mm, the corresponding ring area is mainly composed of vertical sandwich sheets. In contrast, when H is 17 mm, the corresponding ring area is mainly composed of horizontal thin sheets. This study provides a complete picture to understand the ultrasonic cavitation erosion–corrosion on carbon steel.

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References

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Figures

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Fig. 1

Schematic of experimental setup

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Fig. 2

SEM images of ring areas generated in the experiment lasting 20 min; (a) whole ring area, H = 65 mm; (b) details in ring area, H = 65 mm; (c) whole ring area, H = 40 mm; (d) details in ring area, H = 40 mm; (e) whole ring area, H = 17 mm; and (f) details in ring area, H = 17 mm

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Fig. 3

Raman characterization on the ring area (20 min, H = 17 mm); (a) optical microscope image; and (b) Raman spectrum

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Fig. 4

Raman characterization of ring area (1 s, H = 17 mm); (a) optical microscope image; and (b) Raman spectrum

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Fig. 5

SEM images of the ring area generated in the experiment with H = 17 mm; (a) 1 s; (b) 5 min; (c) 10 min; and (d) 15 min

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