00204413

Component

http://onlinepubs.trb.org...searchrpts/1948/6B-003.pdf

AN INVESTIGATION IS DISCUSSED WHICH ESTABLISHED THE FORMULAS OF DISCHARGE FOR CULVERTS OF CONCRETE AND CORRUGATED METAL PIPES WITH SQUARE-EDGED ENTRANCES. THE FLOW IN THE SHORT TUBE IS DIVIDED INTO THREE SEGMENTS: THE ENTRANCE SEGMENT WHERE LOSS OCCURS IN THE SURFACE OF DISCONTINUITY OF THE GRADUALLY VANISHING VENA CONTRACTA AND IS INDEPENDENT OF THE SIZE OF THE TUBE; THE BOUNDARY LAYER SEGMENT IN WHICH THE TURBULENT BOUNDARY LAYER DEVELOPS; AND THE TURBULENT LAYER. THE EFFECTIVE COEFFICIENT OF RESISTANCE IS FOUND BY EXPERIMENTAL METHODS. THE MOMENTUM LAW, TOGETHER WITH THE SUPPOSITION OF A NON-DISSIPATIVE CENTRAL CORE AND THE CONDITION OF CONTINUITY, ENABLES THE DETERMINATION OF THE VARIATION OF BOUNDARY LAYER THICKNESS AND WALL SHEAR WITH DISTANCE FOR A GIVEN RELATIVE ROUGHNESS. THE FORMULAS FORMED WERE COMPARED TO THE EXPERIMENTAL RESULTS WITH SATISFACTORY AGREEMENT.

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01516134

8p

1948-12

Highway Research Board Research Reports

Digital/other

Figures (6)

Boundary layer; Concrete pipe; Corrugated metal culverts; Culverts; Flow; Fluid mechanics; Theory; Turbulence

Turbulent flow

Bridges and other structures; Highways; Hydraulics and Hydrology

TRIS, TRB

Jun 5 1972 12:00AM

• DESCRIPTION OF APPARATUS AND PROCEDURE FOR TESTING FLOW IN GUTTERS AND STORM DRAIN INLETS
• EXPERIMENTS ON FLOW THROUGH INLET GRATINGS FOR STREET GUTTERS, WITH DISCUSSION
• PROGRESS REPORT, COMMITTEE ON SURFACE DRAINAGE OF HIGHWAYS