Optimizing the configuration of a clearwell by integrating pilot and full-scale tracer testing |
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Authors: | Liu Wenjun Du Zhipeng and Jin Junwei |
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Institution: | (1) Department of Environmental Science and Engineering, Tsinghua University, Beijing, 100084, China |
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Abstract: | In this paper, the main factors impacting the plug flow pattern of a clearwell were investigated by integrating pilot-scale,
full-scale clearwell tracer testing and computational fluid dynamics (CFD) simulation. It was found that pilot tracer testing,
full-scale tracer testing and CFD simulation all demonstrated that the correlation between the ratio of t
10/T and L/W can be approximately expressed by: t
10/T = 0.189 4ln(L/W)-0.049 4. This study confirmed that the installation of baffles within clearwells is an efficient way to optimize their configuration.
In addition, the inlet velocity has a minimal contribution to the ratio of t
10/T. However, the ratio of turning channel width to channel width (d/W) significantly contributes to the ratio of t
10/T. The optimal ratio of d/W is 0.8–1.2 for maintaining better plug flow pattern. The number of turning channels is one of the main factors that impact
the ratio of t
10/T. When increasing the number of turning channels, a lower ratio of t
10/T is obtained. |
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Keywords: | tracer testing computational fluid dynamics (CFD) clearwell |
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