Numerical study of effects of flushing gate height and sediment bed properties on cleaning efficiency in a simplified self-cleaning device

Haofei Feng; Shengtao Du; David Zhu

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Numerical study of effects of flushing gate height and sediment bed properties on cleaning efficiency in a simplified self-cleaning device

Haofei Feng,Shengtao Du *,David Zhu

School of Civil & Environmental Engineering and Geography Science, Ningbo University, Ningbo, Zhejiang 315211; School of Civil & Environmental Engineering and Geography Science, Ningbo University, Ningbo, Zhejiang 315211; School of Civil & Environmental Engineering and Geography Science, Ningbo University, Ningbo, Zhejiang 315211

*Correspondence author

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Funding: National Key R&D Program of China （No.No. 2022YFC3203200) and the Ningbo Science Foundation）

Opened online: 4 April 2023

Accepted by: none

Citation: Haofei Feng,Shengtao Du,David Zhu.Numerical study of effects of flushing gate height and sediment bed properties on cleaning efficiency in a simplified self-cleaning device[OL]. [ 4 April 2023] http://en.paper.edu.cn/en_releasepaper/content/4759922

Sediment accumulation in combined sewers can induce blockage and odor problems. Among various cleaning methods, using self-cleaning device generated flushing waves has been thought to be an effective solution. In this study, a series of numerical tests were conducted using a CFD software to investigate the cleaning efficiency of deposited sediment particles based on a simplified self-cleaning device. The CFD model was validated by the experimental and numerical results in the literature. Effects of several parameters including the flushing gate height, sediment bed thickness, sediment bed length and sediment bed position on cleaning efficiency were discussed. A relative accumulative transport rate was defined to analyze the cleaning efficiency. Results showed that the lowest height of flushing gate had the best effects on sediment removal. The flushing waves generated from sudden opening of the flushing gate were capable of cleaning sediment deposit in the given initial sediment bed thickness, length and position. The required time duration for cleaning the sediment deposition completely increased about 6, 3 and 3 times when the sediment bed thickness, sediment bed lenth, and distance between the flushing gate and sediment bed increased 10, 4 and 7 times, respectively.

Keywords:Flushing waves; Self-cleaning; Sediment transport; Flushing duration; CFD

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