Acoustic emission characteristics of underwater gas jet from a horizontal exhaust nozzle

Xu, Weiwei; Lai, Zhounian; Wu, Dazhuan; Wang, Leqin

doi:10.1016/j.apacoust.2012.12.003

Cited by 13 publications

(10 citation statements)

References 23 publications

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“…As a result, the bubble grows larger for prolonged growth time and the oscillation frequency is lower. It is also illustrated in the previous investigations that the longer oscillation period corresponds with the larger bubble diameters [13,32]. The same tendency in stable condensation regime is explicated in an analogous theory that the longer condensation length caused by the higher mass flux requires more time for the jet oscillation cycling [2].…”

Section: Bubble Motionssupporting

confidence: 61%

Pressure oscillation of submerged steam condensation in condensation oscillation regime

Yuan

Chong

Zhao

et al. 2016

International Journal of Heat and Mass Transfer

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The condensation oscillation of submerged steam was investigated theoretically and experimentally at the condensation oscillation regime. It was found that pressure oscillation frequency was consistent with the bubble oscillating frequency and there was a quasi-steady stage when bubble diameters remained constant. A thermal-hydraulic model for the condensation oscillation regime was proposed based on potential flow theory, taking into account the effects of interface condensation and translatory flow. Theoretical derivations indicated that oscillation frequencies were mainly determined by bubble diameters and translatory velocity. A force balance model was applied to the calculation of bubble diameters at quasi-steady stage, and the oscillation frequencies were predicted with the calculated diameters. Theoretical analysis and experimental results turned out that oscillation frequencies at the condensation oscillation regime decreased with the increasing steam mass flux and pool temperature. The predicted frequencies corresponded to the experimental data well with the discrepancies of ±21.7%.

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Section: Bubble Motionssupporting

confidence: 61%

Pressure oscillation of submerged steam condensation in condensation oscillation regime

Yuan

Chong

Zhao

et al. 2016

International Journal of Heat and Mass Transfer

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“…Håkansson et al investigated the location and conditions of cavitation based on a high-pressure homogenizer model with two methods: the scattering of light from cavitation bubbles and the acoustical measurement [79]. Xu et al found the gas velocity could elongate and strengthen the bubbles and increase the AE signals [80]. Husin et al presented a method using the AE technology to detect the bubble inception and burst.…”

Section: The Cavitationmentioning

confidence: 99%

Nondestructive Detection of Valves Using Acoustic Emission Technique

Jin

Heng-hu

Hong

et al. 2015

Advances in Materials Science and Engineering

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The applications of acoustic emission (AE) technique in detection of valves are presented in this review, and the theoretical models and experimental results of nondestructive detection of valves using AE are provided. The generation of AE signals and the basic composition of AE detection system are briefly explained. The applications of AE technique in valves are focused on condition monitoring, failure, cavitation detection, and the development of portable measuring devices. All results prove that the AE technique works well in the detection of valves.

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“…Arghode and Gupta 6 studied characteristics of underwater gas jets with respect to nozzle cross-section and jet momentum for air-water and helium-water system, and illustrated that sound pressure level for elliptical nozzle was lower than that of circular, square, and triangular nozzles. Xu et al 25 studied the sound spectrum generated by steady gas jet from a submerged horizontal nozzle, especially the effects of gas velocity in the range of 35-140 m/s on the sound spectrum. The results indicated that increasing gas velocity would elongate and strengthen bubbles, as well as increase acoustic emission.…”

Section: Introductionmentioning

confidence: 99%

“…Xu et al. 25 studied the sound spectrum generated by steady gas jet from a submerged horizontal nozzle, especially the effects of gas velocity in the range of 35–140 m/s on the sound spectrum. The results indicated that increasing gas velocity would elongate and strengthen bubbles, as well as increase acoustic emission.…”

Section: Introductionmentioning

confidence: 99%

The flow and acoustic characteristics of underwater gas jets from large vertical exhaust nozzles

Miao

Liu

Qin

et al. 2018

Journal of Low Frequency Noise, Vibration and Active Control

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The flow and acoustic characteristics of underwater gas jets exhausted from large vertical nozzles are experimentally investigated in this work with gas flow rates of 30-150 m 3 /h, nozzle widths of d ¼ 10 mm, 20 mm, 30 mm, and 40 mm. A high-speed digital video camera is used to examine bubble behavior and flow regimes. Sound pressure is measured by two hydrophones and recorded by a digital audio tape recorder. The audio and video signals are synchronized to find out the relationship between sound and gas behavior. Experimental results indicate that the general behavior of gas exhausted into water is of periodical necking and expansion. Sound pressure peaks are mostly excited by necking in two ways: pinch-off and redial expansion. Necking itself is a kind of low frequency behavior, corresponding to strong low frequency sounds. Moreover, necking can force the growing bubble to oscillate and emit broadband sound. As the gas velocity increases, necking would happen more frequently, and gas jets would grow into larger volume in shorter time, and then the sound radiated from the gas jets would have higher frequency and larger amplitude.

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Acoustic emission characteristics of underwater gas jet from a horizontal exhaust nozzle

Cited by 13 publications

References 23 publications

Pressure oscillation of submerged steam condensation in condensation oscillation regime

Pressure oscillation of submerged steam condensation in condensation oscillation regime

Nondestructive Detection of Valves Using Acoustic Emission Technique

The flow and acoustic characteristics of underwater gas jets from large vertical exhaust nozzles

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