Author(s): William W. L. Huang
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Keywords: No Keywords
Abstract: This is paper presents a formula of velocity profile along section of open channel flow determined by the law of maximum rate of energy dissipation proposed by the author in 1975. The analysis partly follows the mixing length theory for turbulent flow in that the length 1 is a dimensionless multiple of the depth y of the level of flow line, but replaces the Karman constant k=0.4 by a variable η=η (Y) which varies from 1 at the bottom to 0 at the surface of flow. The total rate of energy reserved in the section shall invarianly be a minimum. The calculated velocity profile by the proposed formula ba been checked precisely by the experimental data measurea by the U. S. Geological survey in Denver, Colorado. The discre-pancy of results in using the prandtl-karman formula with the measured data is manifested in comparison.
Year: 1989