Limitations of Reduced Scale Testing on Parshall Flumes

by Steven J. Wright, Univ of Michigan, Ann Arbor, United States,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


A model for the boundary layer development in the entrance section of a Parshall flume is developed to account for the effects of fluid viscosity on flume calibration equations. Data for a 30.5 cm (q ft) throat width flume and a one-third scale model are analyzed to demonstrate that Froude scaling relations can be used to predict calibration from reduced scale models only after boundary layer corrections are applied. These corrections are most significant at low discharges and recommendations are made for flow conditions above which viscous effects are negligible.

Subject Headings: Flumes | Mathematical models | Scale models | Structural models | Fouling | Calibration | Mathematics | Viscosity

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