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http://dx.doi.org/10.5762/KAIS.2015.16.4.2868

The estimation of friction coefficient by using entropy theory in open channels  

Choo, Tai Ho (Dept. of Environmental and civil Engineering, Pusan National University)
Kwak, Kil Sin (Dept. of Environmental and civil Engineering, Pusan National University)
Yun, Gwan Seon (Dept. of Environmental and civil Engineering, Pusan National University)
Yoon, Hyeon Cheol (Dept. of Environmental and civil Engineering, Pusan National University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.16, no.4, 2015 , pp. 2868-2875 More about this Journal
Abstract
Both the friction velocity and the friction coefficient have to be estimated to determine flow characteristic in an open channel. In spite of the importances in an open channel, the complete interpretation is highly difficult because of free water surface, the complex of cross section and the various hydraulic parameters. The researches related to the friction factor are based on empirical outcome. Therefore, the equations are difficult to be generally applied. For that reason, the new friction factor estimation equation using the entropy concept was proposed in the present study, and the data measured in rectangular and trapezoid cross sections was used to verify the accuracy of equation. The advantage of the proposed equation dose not use the energy slope term which is difficult to be measured and to be estimated in an open channel. In addition, the proposed method showed that the accurate friction factor f can be estimated on the Basis of theoretical background.
Keywords
entropy; friction coefficient; friction velocity; open channel; Reynolds number;
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