It has been verified in this paper, by theoretical analysis with two-phase fluid mechanics and hydraulic tests, that decreasing surface roughness in a wade stack can not increase critical discharge.
本文通过两相流理论分析和水力学试验验证证实：室内排水立管管壁粗糙度的减小，不仅不能加大其临界流量，反而会减小其临界流量。
The roughness coefficient as an important parameter is very critical and useful to the hydraulic engineering whenever on the stage of design, construction, operation and management of the project.
糙率系数作为水力计算中一个至关重要的参数，对其变化规律及取值范围的研究是进行各种水利工程设计、施工、运行和管理过程中的重要工作。
The roughness coefficient as an important parameter is very critical and useful to the hydraulic engineering whenever on the stage of design, construction, operation and management of the project.
糙率系数作为水力计算中一个至关重要的参数，对其变化规律及取值范围的研究是进行各种水利工程设计、施工、运行和管理过程中的重要工作。
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