Numerical Modeling of Air/Water Mixtures for Internal Flows

by Paul N. Hopping, TVA Engineering Lab, Norris, United States,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

The Tennessee Valley Authority (TVA) currently is working with several organizations to develop design tools for the aerating hydroturbine. Part of this effort includes the investigation of numerical models to predict the air/water flow in a turbine, including the uptake of dissolved oxygen. To test formulations for two-phase flow, preliminary studies have focused on the downward flux of an incompressible, air/water mixture in a vertical, circular conduit. In the work described herein, a formulation is used that is based on mixture theory. Although the model is successful in obtaining a solution, no data for verification are available at this time. Many other factors need to be explored before extending the formulation to complex geometries such as those in a hydroturbine.

Subject Headings: Mixtures | Numerical models | Dissolved oxygen | Turbines | Aeration | Turbulent flow | Stratified flow | Tennessee | United States

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