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Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
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Gradually varying flow (GVF) in open channels describes situations where water depth changes slowly along the channel due to factors like non-uniform bed slope, channel shape variations, or obstructions. This flow type occurs when the depth adjusts gradually to balance gravitational forces, shear forces, and energy requirements, resulting in a low rate of depth change.Characteristics of Gradually Varying FlowGVF is commonly observed in natural streams, rivers, and canals, where flow depth...
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In aerobic fermentations, oxygen is vital for microbial growth and metabolite production. Since air comprises only about 20% oxygen and the gas is poorly soluble in water—just 9 ppm at 20°C—supplying sufficient oxygen becomes a critical challenge, especially in high-demand processes like yeast growth or citric acid production. Even a fully saturated broth may offer only a few seconds of oxygen availability.To address this, sterile or scrubbed air is introduced into the...
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Related Experiment Video

Updated: Apr 10, 2026

A Flow-through Exposure System for Evaluating Suspended Sediments Effects on Aquatic Life
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Enhancing sedimentation by improving flow conditions using parallel retrofit baffles.

Cheng He1, Eric Scott2, Quintin Rochfort1

  • 1National Water Research Institute, Environment Canada, 867 Lakeshore Road, Burlington, Ontario L7R 4A6, Canada.

Journal of Environmental Management
|June 18, 2015
PubMed
Summary

Parallel-connected baffles improve total suspended solids (TSS) removal by creating uniform, slower flow in sedimentation basins. This retrofit design is more effective and potentially economical than series-connected baffles.

Keywords:
Enhanced sedimentationIncreased residence timeLaboratory experimentsRetrofit baffles

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Area of Science:

  • Environmental Engineering
  • Fluid Mechanics
  • Water Treatment Technologies

Background:

  • Sedimentation basins are crucial for removing total suspended solids (TSS).
  • Hydraulic inefficiencies like short-circuiting and non-uniform flow reduce TSS removal efficiency.
  • Existing baffle designs, such as series-connected, have limitations in flow dispersion and space utilization.

Purpose of the Study:

  • To propose and evaluate a novel parallel-connected baffle configuration for enhancing TSS removal.
  • To compare the hydraulic performance and TSS removal efficiency of parallel-connected baffles against series-connected baffles.
  • To assess the economic feasibility of the proposed retrofit baffle design.

Main Methods:

  • Laboratory-scale experiments were conducted to assess baffle performance.
  • TSS removal efficiency was measured for both parallel and series baffle configurations.
  • Flow residence time and uniformity were analyzed under different inflow conditions.

Main Results:

  • Parallel-connected baffles significantly improved flow uniformity and increased residence time compared to series-connected baffles.
  • The parallel configuration demonstrated superior TSS removal efficiency.
  • Parallel baffles disperse flow more rapidly and in less space, effectively dampening inflow velocity.

Conclusions:

  • The proposed parallel-connected baffle design offers a more effective solution for enhancing TSS removal in sedimentation basins.
  • This design mitigates flow disturbances, preventing settled particle resuspension, especially under high inflow rates.
  • Parallel retrofit baffles present a potentially more economical option for large sedimentation basins compared to series-connected designs.