Experimental study on the effect of a diversion pier on stabilizing the vortex flow in a vortex-chamber-type sediment extractor

Chyan-Deng Jan, Yu Chao Hsu, Tsung Hsien Huang

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1 Citation (Scopus)

Abstract

The Vortex-Chamber-Type sediment extractor is composed of vortex chamber, inflow channel, and overflow channel. The muddy water flows into the vortex chamber through tangential inflow channel, and then moves as a vortex flow inside the chamber. The water and sediment will be separated due to the gravity and centrifugal force. The flow goes through the bottom orifice corresponded to muddy water with a high sediment concentration, and the flow goes through the overflow weir should be clear water with a low sediment concentration. This study carried out laboratory experiments to investigate the effect of the installation of a diversion pier in a vortex chamber type extractor on promoting the stability of vortex and increasing sediment removal efficiency. The vortex chamber used in this study has a total height of 25 cm, an internal diameter of 100 cm, and a deflector of 25 cm in width and 15 cm in height. The deflector covers a half circle of the chamber ranging from Θ = 0° to 180°. The diversion pier has the same height as the deflector. Therefore no water will flow through the diversion pier. The experimental arrangements include five pier lengths, four pier positions, and four pier directions. The inflow discharge (Qi) used in clear water experiments ranged from 0.001 cms to 0.006 cms. In the muddy water experiments, the inflow discharge (Qi) is 0.004 cms; and the inflow sediment concentrations (Ci) are between 5,000 ppm and 7,000 ppm. The median diameter (dm) of the sediment is 0.062 mm. Based on the experimental data, this study analyzes the effects of the installation of a diversion pier in a vortex chamber on the vortex stability, water abstraction ratio, and sediment removal efficiency.

Original languageEnglish
Pages (from-to)44-55
Number of pages12
JournalTaiwan Water Conservancy
Volume62
Issue number1
Publication statusPublished - 2014 Jan 1

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Water Science and Technology

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