Study Of The Application Of Acoustic Emission
Technology For On-line Monitoring Of Bubble
Phenomena And Flow Patterns In
Two-phase Gas-liquid Flow
Author(s)
S. Husin, A. Addali & D. Mba
Abstract
An investigation into single bubble dynamics detection in a liquid-filled column,
and monitoring and measurement of gas void fraction in a horizontal pipe using
AE technology has been performed. A correlation between Acoustic Emission
(AE) and Gas Void Fractions in two-phase gas-liquid flow in a horizontal pipe
has been established from this work. The results demonstrate the feasibility of
employing AE technology as an on-line monitoring tool for bubble dynamics and
flow patterns in two-phase gas-liquid flow in pipes.
Keywords: Acoustic Emission (AE), gas bubble, two-phase flow.
1 Introduction
Acoustic Emission (AE) technology is very practical as a passive and intrusive
tool for the monitoring of material processes and for the testing, detection, and
characterization of any present defect or particular event. AE describes the
process associated with the emission and propagation of strain waves, resulting
from localized modifications of materials [1]. If there is a transient release of
energy within a solid/medium, it is dissipated in the form of elastic waves which
can be detected on the surface by transducers. This process is known as Acoustic
Emission (AE) [2]. The frequency of the elastic wave is usually beyond the
human hearing threshold (25 kHz). The sensitivity of the AE transducer which is
made of piezoelectric material can detect sound beyond the human range of
hearing, i.e. 25 kHz-1MkHz is regarded as the backbone of AE technology.
Keywords
Acoustic Emission (AE), gas bubble, two-phase flow.
Related Book
Other papers in this volume
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