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Turbulent open-channel flows: drop generation and self-aeration

Rein, M. (1998) Turbulent open-channel flows: drop generation and self-aeration. Journal of Hydraulic Engineering, 124 (1), pp. 98-102.

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Abstract

The self-aeration of high velocity open-channel flows is attributed to the interaction between the turbulent flow and the liquid free surface. In addition to self-aeration, drops are ejected out of the bulk liquid. It is often proposed that the drops are separated from the bulk by transverse velocity fluctuations. Drops falling back into the liquid later have been suggested to provide a possible mechanism of air entrainment. These ideas have led to the formulation of critical conditions for the inception of self-aeration. It will be shown that the conventional concepts of drop formation are inadequate to explain the ejection of drops to the heights that were observed in experiments. Furthermore, the energy of ejected drops is not sufficiently high for air entrainment. Critical conditions of self-entrainment that were previously derived are, therefore, invalid.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=2003,
Title:Turbulent open-channel flows: drop generation and self-aeration
Authors:
AuthorsInstitution or Email of Authors
Rein, M.UNSPECIFIED
Date:1998
Journal or Publication Title:Journal of Hydraulic Engineering
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:124
Page Range:pp. 98-102
Status:Published
Keywords:free surface flows, free surface turbulence, air entrainment, self aeration
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology
Deposited By: elib DLR-Beauftragter
Deposited On:31 Jan 2006
Last Modified:14 Jan 2010 19:17

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