Characteristics of energy dissipation in hyperconcentrated flows |
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| Authors: | An-ping SHU Qing-quan LIU Yu-jun YI Zhi-dong ZHANG |
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| Institution: | [1]Assoc. Prof., School of Environment, Key Laboratory of Water and Sediment Sciences of Ministry of Education, Beijing Normal University, Beijing 100875, China [2]Prof., Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China [3]Lecturer, Dr., School of Environment, Beijing Normal University, Beijing 100875, China [4]Graduate student, School of Environment, Beijing Normal University, Beijing 100875, China |
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| Abstract: | An equilibrium equation for the turbulence energy in sediment-laden flows was derived on the basis of solid-liquid two-phase flow theory.The equation was simplified for two-dimensional,uniform,steady and fully developed turbulent hyperconcentrated flows.An energy efficiency coefficient of suspended-load motion was obtained from the turbulence energy equation,which is defined as the ratio of the sediment suspension energy to the turbulence energy of the sediment-laden flows.Laboratory experiments were conducted to investigate the characteristics of energy dissipation in hyperconcentrated flows.A total of 115 experimental runs were carried out,comprising 70 runs with natural sediments and 45 runs with cinder powder.Effects of sediment concentration on sediment suspension energy and flow resistance were analyzed and the relation between the energy efficiency coefficient of suspended-load motion and sediment concentration was established on the basis of experimental data.Furthermore,the characteristics of energy dissipation in hyperconcentrated flows were identified and described.It was found that the high sediment concentration does not increase the energy dissipation;on the contrary,it decreases flow resistance. |
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| Keywords: | Hyperconcentrated flows Turbulence energy Efficiency coefficient Energy dissipation |
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