Measurement of Air in Flowing Water

by Alan F. Babb, (M.ASCE), Head of Albrook Hydr, Lab., and Prof. of Civ. and Environmental Engrg.; Washington State Univ., Pullman, Wash. 99164,
Henry C. Aus, Project Mgr.; Pazooki and McMenamin Consulting Engrs., Silverdale, Wash, 98383,

Serial Information: Journal of the Hydraulics Division, 1981, Vol. 107, Issue 12, Pg. 1615-1630

Document Type: Journal Paper


Procedures are developed using gamma ray and hot-film anemometer methods for determining void fraction and sizes of air bubbles entrained in flowing water. The hot-film data are analyzed by computer. The gamma ray data are used to determine the duration factor, a term accounting for the additional time that must be added to the time sensed by the hot-film anemometer to arrive at the true bubble duration. The duration factor is found to be a function of velocity. The procedures are developed using a hydraulic jump with Froude number 6. The continuity equation is used in conjunction with void fraction and mean velocity data to compute the location of air entering and leaving the jump.

Subject Headings: Air flow | Gamma function | Measuring instruments | Voids | Computer analysis | Entrainment | Hydrologic data | Hydraulic jump

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