Measurement of Velocity-Concentration Covariance

by Paul S. McQuivey, Res. Hydrol.; U.S. Geological Survey, Bay St. Louis, MO,
Thomas N. Keefer, Res. Hydrol.; U.S. Geological Survey, Bay St. Louis, MO,

Serial Information: Journal of the Hydraulics Division, 1972, Vol. 98, Issue 9, Pg. 1625-1646

Document Type: Journal Paper


A single-electrode conductivity probe in a bridge circuit and a hot-film sensor and anemometer were used to make the first known measurements of the longitudinal velocity-concentration covariance, uc, along a diffusing plume in the flow. The measurements were made in a 3.87-ft (1.18-m) wide flume over three boundary roughnesses. From these measurements the Boussinesq-type mass transfer coefficient was directly evaluated and compared with the longitudinal-diffusion coefficients obtained from a floating-particle study at the water surface. Within experimental accuracy the results show that the Boussinesq-type transfer coefficient is an adequate model for describing the scalar transport process.

Subject Headings: Probe instruments | Flow measurement | Boussinesq equations | Model accuracy | Bridges | Measuring instruments | Fluid velocity | Diffusion

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