Measuring Air Concentration in Flowing Air-Water Mixtures

by Boualem Hadjerioua, Tennessee Valley Authority, Norris, United States,
Tony A. Rizk, (M.ASCE), Tennessee Valley Authority, Norris, United States,
Emmett M. Laursen, (M.ASCE), Tennessee Valley Authority, Norris, United States,
Margaret S. Petersen, (Hon.M.ASCE), Tennessee Valley Authority, Norris, United States,



Document Type: Proceeding Paper

Part of: Fundamentals and Advancements in Hydraulic Measurements and Experimentation

Abstract:

This paper describes the use of an electrical conductivity probe to determine aeration of a plunge pool by an overfall nappe. The probe was calibrated using an apparatus designed to provide known concentrations of an air-water mixture with controlled bubble sizes. The calibrated probe was then used to measure air concentration in a full-scale physical model of an aerating weir with different nappe impinging velocities, unit discharges, and tailwater depths. Calibration curves and measured representative plunge pool air concentrations are presented.

Subject Headings: Flow measurement | Probe instruments | Calibration | Scour | Mixtures | Electrical conductivity | Air flow

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