### 抜粋

Turbulent mixing across heat-stratified density interfaces was studied in the laboratory using oscillating-grid generated turbulence. The aim was to study the transition between the entrainment regimes dominated by interfacial wave-breaking and molecular diffusion, and to study the characteristics of the latter. It was observed that, above a critical Richardson number Ri_{c}, which depends on the Peclet number Pe, the mixing due to wave breaking disappears and that Ri_{c} ∼ Pe^{-n}, where the mean value of the exponent n is approximately 1 2. Above Ri_{c}, the entrainment is molecular-diffusion dominated and takes place through a sequence of events: the buoyancy gradient of the initially sharp density interface is weakened by molecular diffusion until the mixed-layer eddies can engulf a portion of the interfacial layer wherefore the interface sharpens again. Thus, the entrainment events are recurrent with a rate-controlling diffusion stage between them. An entrainment law of the form E ∼ Ri^{-2}Pe^{-2}, where E is the entrainment coefficient and Ri is the Richardson number, is suggested for the diffusion-dominated entrainment regime.

元の言語 | 英語 |
---|---|

ページ（範囲） | 187-215 |

ページ数 | 29 |

ジャーナル | Dynamics of Atmospheres and Oceans |

巻 | 17 |

発行部数 | 2-3 |

DOI | |

出版物ステータス | 出版済み - 1 1993 |

外部発表 | Yes |

### All Science Journal Classification (ASJC) codes

- Oceanography
- Geology
- Computers in Earth Sciences
- Atmospheric Science

## フィンガープリント The role of molecular diffusion in the deepening of the mixed layer' の研究トピックを掘り下げます。これらはともに一意のフィンガープリントを構成します。

## これを引用

*Dynamics of Atmospheres and Oceans*,

*17*(2-3), 187-215. https://doi.org/10.1016/0377-0265(93)90018-3