| Summary: | © The Author(s) 2019. We consider the size spectrum of entrained bubbles under strong free-surface turbulence (SFST). We investigate the entrainment bubble-size spectrum per unit (mean) interface area, , with dimension length, and develop a physical/mechanistic model for through energy arguments. The model obtains two distinct regimes of , separated by bubble-size scale. For bubble radius r-{0}]>, the effects of gravity dominate those of the surface tension force , and , where is the turbulence dissipation rate. For and <![CDATA[r; the value ; the scaling ; and the predictions of the-entrainment regime map.
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