TY - JOUR
T1 - Estimation of aggressive intensity of a cavitating jet with multiple experimental methods
AU - Kang, Can
AU - Liu, Haixia
AU - Soyama, Hitoshi
N1 - Funding Information:
This work was partly supported by JSPS KAKENHI under grant number 17H03138 . The authors thank Mr. M. Mikami, technician, and Mr. S. Song, ex-student, Tohoku University for their help with the experiment.
Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2018/1/15
Y1 - 2018/1/15
N2 - An experimental study on the cavitating jet was conducted with emphasis placed on the detection of the energy that is emitted by the collapse of cavitation bubble. Four experimental methods, each respectively utilizing a hydrophone, an acoustic emission (AE) sensor, a laser Doppler vibrometer, and a polyvinylidene fluoride (PVDF) sensor, were compared. Aluminum specimens served as the target that would endure the impact of the cavitating jet. The mass loss was measured and the cumulative erosion rate was calculated. Various upstream pressures were used, and the effect of the cavitation number was considered as well. The results indicated that the cumulative erosion rate becomes maximum with the increase in the erosion time, and it is insensitive to variations in upstream pressure. The time span that is required for the cumulative erosion rate to reach its maximum value becomes shorter for high upstream pressures. An overall increase in the normalized energy is evident as the upstream pressure increases. At any given upstream pressure, the normalized energy varies inversely with the threshold level. The optimum threshold levels were obtained separately for each of the four methods. The correlation between the maximum erosion rate and the normalized energy was established statistically. The PVDF sensor proved to be the most effective instrument in estimating the aggressive intensity of the cavitating jet.
AB - An experimental study on the cavitating jet was conducted with emphasis placed on the detection of the energy that is emitted by the collapse of cavitation bubble. Four experimental methods, each respectively utilizing a hydrophone, an acoustic emission (AE) sensor, a laser Doppler vibrometer, and a polyvinylidene fluoride (PVDF) sensor, were compared. Aluminum specimens served as the target that would endure the impact of the cavitating jet. The mass loss was measured and the cumulative erosion rate was calculated. Various upstream pressures were used, and the effect of the cavitation number was considered as well. The results indicated that the cumulative erosion rate becomes maximum with the increase in the erosion time, and it is insensitive to variations in upstream pressure. The time span that is required for the cumulative erosion rate to reach its maximum value becomes shorter for high upstream pressures. An overall increase in the normalized energy is evident as the upstream pressure increases. At any given upstream pressure, the normalized energy varies inversely with the threshold level. The optimum threshold levels were obtained separately for each of the four methods. The correlation between the maximum erosion rate and the normalized energy was established statistically. The PVDF sensor proved to be the most effective instrument in estimating the aggressive intensity of the cavitating jet.
KW - Cavitation erosion
KW - Correlation
KW - Cumulative erosion rate
KW - Energy
KW - Experimental methods
KW - Jet
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U2 - 10.1016/j.wear.2017.11.001
DO - 10.1016/j.wear.2017.11.001
M3 - Article
AN - SCOPUS:85033382450
SN - 0043-1648
VL - 394-395
SP - 176
EP - 186
JO - Wear
JF - Wear
ER -