Experimental Investigation of Air Bubble Curtain Effects on Water Wave Field-Reference-Cited by-同舟云学术

Experimental Investigation of Air Bubble Curtain Effects on Water Wave Field

Published:2022-04-27 Issue: Volume:415 Page:81-99
ISSN:1662-9507
Container-title:Defect and Diffusion Forum
language:
Short-container-title:DDF

Author:

Neves Diogo R.C.B.¹,Brito Moisés²,Pires-Silva António Alberto³,Fortes Conceição Juana⁴,Matos Jorge³

Affiliation:

1. INEGI

2. NOVA University Lisbon, UNIDEMI

3. Universidade de Lisboa

4. Harbours and Maritime Structures Division, Hydraulics and Environment Department

Abstract

This paper studies the effects of an air bubble curtain on surface water waves. Water particle velocities and free surface elevations were measured simultaneously at two cross-shore locations downstream of the air bubble curtain. Measurements were carried out for regular waves using different air bubble curtain configurations. Free surface elevations were measured using resistive gauges and the instantaneous velocities were acquired using an Acoustic Doppler Velocimeter (ADV). The characteristics of the free surface elevation time series, velocity field and turbulence are analyzed and discussed. The free surface elevation was found to be attenuated by the air bubble curtains. The phase averaged velocity profiles also depict the effect of the air bubbles in the flow field by generating milder longitudinal velocities (u) and by increasing the transverse component of the velocity (w). The increase in the turbulence intensity and the different energy spectrum produced by the air bubble curtain is also observed. The experimental results indicate that the thickness of the air bubble curtain and the total air flow rate affects the wave field.

Publisher

Trans Tech Publications, Ltd.

Subject

Condensed Matter Physics,General Materials Science,Radiation

Link

https://www.scientific.net/DDF.415.81.pdf

Reference19 articles.

1. H. Chanson, Air bubble entrainment in free surface turbulent shear flows, Academic Press, (2002).

2. H. Chanson, Hydraulics of aerated flows: qui pro quo?, J. Hydr. Res., 51(3), 223-243, J. Hydraulic Research, vol. 51, no. 3, p.223–243, (2013).

3. H. Chanson, S. Aoki, and A. Hoque, Scaling Bubble Entrainment And Dispersion In Vertical Circular Plunging Jet Flows: Freshwater Versus Seawater, in Proc. 5th Intl Conf. On Hydrodynamics ICHD2002, (2002).

4. A. Hoque, Studies of water level rise by entrained air in the surf zone, Exp. Therm. Fluid Sci., vol. 32, no. 4, p.973–979, Feb. 2008,.

5. A. Hoque and S. Aoki, Air entrainment and associated energy dissipation in steady and unsteady plunging jets at free surface, Appl. Ocean Res., vol. 30, no. 1, p.37–45, Feb. 2008,.