Author(s): Matthias Kramer

Linked Author(s): Matthias Kramer

Keywords: channel flow; turbulent flow; bubble dynamics; air-entrainment

Abstract: The characterization and the modelling of air concentration distributions in self-aerated high Froude number free-surface flows has been subject to sustained research interest since the 1970s. Different groups of researchers have conceptualized the air concentration using single-layer or double-layer approaches. Here, it is argued that a double-layer (or multi-layer) approach better reflects the physical nature of the structure of an air water flow, which is also supported by experimental observations of several distinct flow regions in self-aerated flows, including a bubbly flow region, a free-surface region, characterized by free-surface perturbations/waves, and a spray/droplet region. In the present work, new modelling approaches for the air concentration distribution are presented, following Kramer and Valero (2023); Kramer (2024).

DOI: https://doi.org/10.3929/ethz-b-000675921

Year: 2024