Acoustic emission measurement of low velocity plunging jets to monitor bubble size

Acoustic emission measurement is a possible method for non-invasive, real-time process monitoring. The monitoring of acoustic emissions from a laboratory scale plunging jet at low velocities has been shown to allow identification of the onset of air entrainment, differentiate between certain types of hydrodynamic regime. The acoustic technique has been used to measure the variation of average bubble size and bubble size distribution with jet flow rate and nozzle height. NaCl and xanthan gum solutions have been used to demonstrate the effects of coalescence repression and viscosity respectively on variation of bubble size with jet flow rate and nozzle height.

[1]  Manabu Iguchi,et al.  Mean velocity and turbulence characteristics of water flow in the bubble dispersion region induced by plunging water jet , 1998 .

[2]  Aniruddha B. Pandit,et al.  Measurement of bubble size distribution: an acoustic technique , 1992 .

[3]  Lawrence A. Crum,et al.  Observations of underwater sound from laboratory breaking waves and the implications concerning ambient noise in the ocean , 1994 .

[4]  Hubert Chanson,et al.  Scaling Bubble Entrainment And Dispersion In Vertical Circular Plunging Jet Flows: Freshwater Versus Seawater , 2002 .

[5]  Graeme J. Jameson,et al.  Prediction of the bubble size generated by a plunging liquid jet bubble column , 1992 .

[6]  Julie Varley,et al.  The uses of passive measurement of acoustic emissions from chemical engineering processes , 2001 .

[7]  M. Minnarert,et al.  Musical air-bubbles and the sound of running water , 1933 .

[8]  A. K. Biń,et al.  Gas entrainment by plunging liquid jets , 1988 .

[9]  Y. Kawase,et al.  Minimum liquid fluidization velocity in two- and three-phase fluidized beds with non-Newtonian fluids , 1998 .

[10]  J. Varley,et al.  Sound measurement as a means of gas‐bubble sizing in aerated agitated tanks , 1998 .

[11]  Eamon McKeogh,et al.  Air entrainment rate and diffusion pattern of plunging liquid jets , 1981 .

[12]  Ali R. Kolaini,et al.  Sound radiation by various types of laboratory breaking waves in fresh and salt water , 1998 .

[13]  P. White,et al.  The detection and dimension of bubble entrainment and comminution , 1998 .

[14]  Alvin W. Nienow,et al.  Bubble Sizes in Electrolyte and Alcohol Solutions in a Turbulent Stirred Vessel , 1997 .

[15]  M. Minnaert.  XVI.On musical air-bubbles and the sounds of running water , 1933 .

[16]  T. Leighton.  The Acoustic Bubble , 1994 .

[17]  V. Linek,et al.  The effect of surface-active additives on bubble coalescence in aqueous media , 1999 .