Acoustic emission characteristics of single nozzled bubble

WANG Xin1 LI Meihui1 LI Xiaolei1 YANG Zhuan1 HE Limin1

(1.Provincial Key Laboratory of Oil and Gas Storage and Transportation, College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao, Shandong, China 266580)

【Abstract】Dynamic characteristics of single bubbles in gas-liquid two-phase flow were studied by acoustic emission technique in an experimental setup of single bubble generator. The parameters of acoustic emission signal in bubbles were extracted using self-developed data acquisition and processing program. The acoustic signals in time and frequency domains were then analyzed by statistical analysis, wavelet transform and fast Fourier transform. The results showed that the acoustic emission technique could detect acoustic signals of bubbles inside pipe with a high signal to noise ratio, in which the acoustic signal increased with the size of nozzle but decreased with the surface tension of liquid. By comparing the frequency spectra of bubbles from nozzle with different diameters, it was found that the acoustic signal frequency emitted by bubbles was between 150 kHz–200 kHz and the peak frequency increased with nozzle diameter. A correlation function was proposed between peak frequency of acoustic signals and bubble diameter. Meanwhile, a continuous bubble evolution diagram was obtained for bubble floating up and the generation mechanism of acoustic signals by bubbles was analyzed. The study demonstrates that acoustic emission technique is highly sensitive and very convenient for the measurement of bubble motions in gas-liquid two-phase pipe flow.

【Keywords】 gas-liquid flow; bubble; measurement; acoustic emission;

【DOI】

【Funds】 National Natural Science Foundation of China (51376197) supported by the National Natural Science Foundation of China (51376197)

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(Translated by CHENG QZ)

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This Article

ISSN:0438-1157

CN: 11-1946/TQ

Vol 68, No. 05, Pages 1794-1802

May 2017

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Article Outline

Abstract

  • Introduction
  • 1 Generating mechanism of bubbles
  • 2 Testing apparatus and measurement methods
  • 3 Experimental results and analysis
  • 4 Conclusions
  • Symbol description
  • References