Bubble entrainment in breaking wind waves

Article English OPEN
  • Publisher: Co-Action Publishing
  • Journal: Tellus A (issn: 1600-0870, eissn: 0280-6495)
  • Related identifiers: doi: 10.3402/tellusa.v34i5.10833
  • Subject:
    arxiv: Physics::Fluid Dynamics

Processes of bubble formation and spreading in breaking wind waves are experimentally investigated in a wind-wave tank. The distribution and movement of bubbles relative to the wave form are measured using photographic techniques. The main mechanism of bubble formation in these waves is intermittent bubble entrainment by an ordered convergent flow on the leading slope near the crest. This conclusion is supported by a simple experiment for modeling the bubble entrainment, where a small jet of water is injected into water whose surface is at rest: bubbles are entrained by the water jet. In the oceans, the mechanism under consideration will be important in understanding the breaking process of smaller scale waves superposed on dominant waves. A model experiment also shows that the existence of a stagnation point on a water surface (convergent flow) is not a sufficient condition for bubble entrainment. The downward force of the convergent flow must be greater than the restoring force of the surface tension at the stagnation point for bubble entrainment to occur.DOI: 10.1111/j.2153-3490.1982.tb01836.x
  • References (13)
    13 references, page 1 of 2

    Banner, M. L. and Phillips, 0. M. 1974. On the incipient breaking of small scale waves. J. Fluid Mech. 65. 647-656.

    Blanchard, D. C. and Woodcock, A. H. 1957. Bubble formation and modification in the sea and its meteorological significance. Tellus 9, 145- 158.

    Cokelet. E. D. 1977. Breaking waves. Nature 267. 769-774.

    Datta. R. L., Napier, D. H. and Newitt, D. M. 1950. The properties and behaviour of gas bubbles formed at a circular orifice. Trans. Instr. Chem. Engrs. 28, 14-26.

    Glotov. V. P.. Kolovayev, P. A. and Neuimin. G . G . 1962. Investigation of the scattering of sound by bubbles generated by an artificial wind in sea water and the statistical distribution of bubble sizes. Sooiet physics-Acoustics 7. 34 1-345.

    Johnson, B. D. and Cooke. R. C. 1979. Bubble populations and spectra in coastal waters: a photographic approach. J. Geophys. Res. 8 4 , 376 1- 3766.

    Koga. M. 1981. Direct production of droplets from breaking wind waves-its observation by a multicolored overlapping exposure photographing technique. Tellus 33, 552-563.

    Kolovayev, P. A. 1976. Investigation of the concentration and statistical size distribution of windproduced bubbles in the near-surface ocean layer. Oceanology, Engl. Transl. 15,659-66 1.

    Longuet-Higgins, M. S . and Turner, J. S . 1974. An “entraining plume” model of a spilling breaker. J. Fluid Mech. 63, 1-20.

    Medwin, H. 1977. In situ acoustic measurements of microbubbles at sea. J. Geophvs. Res. 82. 971-976.

  • Metrics
    No metrics available
Share - Bookmark