Self-Aerated Flow Characteristics in Wall Region

by Nagar S. Lakshmana Rao, (A.M.ASCE), Prof.; Dept. of Civ. and Hydr. Engrg., Indian Inst. of Science, Bangalore, India,
Thimmaiah Gangadharaiah, Sr. Res. Asst.; Dept. of Civ. and Hydr. Engrg., Indian Inst. of Sci. Bangalore, India,


Serial Information: Journal of the Hydraulics Division, 1971, Vol. 97, Issue 9, Pg. 1285-1303


Document Type: Journal Paper

Abstract: Characteristics of self-aerated flows in the wall region are studied. The distribution of velocity and air concentration in the wall turbulent zone is studied by dividing the wall turbulent zone into an inner and outer region according to the eddy viscosity distribution. It is shown that the inner region ceases to exist under certain conditions. Air concentration on the wall is estimated. The values of the Karman constant and Manning's roughness coefficient show an increase in their value as air concentration increases. An estimation of the average velocity and the probable diameter of an air bubble shows a definite relation with mean air concentration in the wall region.

Subject Headings: Walls | Velocity distribution | Aeration | Turbulent flow | Eddy (fluid dynamics) | Viscosity | HVAC | Hydraulic roughness

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