Book chapter
Bubble Entrainment and Distribution in a Model Spillway with Application to TDG Minimization
Impacts of Global Climate Change, pp.1-12
2005
DOI: 10.1061/40792(173)299
Abstract
An experimental study of the two-phase flow downstream of a model fish bypass is presented. Experiments were carried out on a 1/24 scale model of a fish bypass under study for construction at Wanapum Dam, on the Columbia River in Washington State. The model was operated at the design condition of skimming flow regime, and at the possible off-design plunging and surface jump regimes. Gas volume fraction data was collected using a specifically built optical phase detection probe on a three-dimensional grid, and the phase indicator function was recorded at selected locations. It was found that on model scale the skimming flow regime effectively prevents bubbles from reaching deep into the talrace, resulting in considerable lower gas volume fraction than plunging and surface jump regimes. For this geometry, the surface jump regime entrains air deeper than plunging regime. Total dissolved gas (TDG) estimations were made assuming that the bubbles are instantaneously absorbed by the water. The instantaneous source of TDG was computed. Time distributions of the indicator function are also reported.
Details
- Title: Subtitle
- Bubble Entrainment and Distribution in a Model Spillway with Application to TDG Minimization
- Creators
- Pablo M CarricaLarry J WeberShae S Hoschek
- Resource Type
- Book chapter
- Publication Details
- Impacts of Global Climate Change, pp.1-12
- DOI
- 10.1061/40792(173)299
- Language
- English
- Date published
- 2005
- Academic Unit
- Civil and Environmental Engineering; IIHR--Hydroscience and Engineering; Mechanical Engineering
- Record Identifier
- 9984196966102771
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