Confined Plunging Liquid Jets for Dilution of Brine from Desalination Plants
| Autor: | Aaron C. Chow, Edward Eric Adams, Jongyoon Han, Bader Al-Anzi, Ishita Shrivastava |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
010504 meteorology & atmospheric sciences
plunging jet Bubble multiphase flow 0207 environmental engineering Mixing (process engineering) Bioengineering TP1-1185 02 engineering and technology air entrainment 01 natural sciences desalination Chemical Engineering (miscellaneous) 020701 environmental engineering Penetration depth QD1-999 aeration 0105 earth and related environmental sciences Jet (fluid) Chemical technology Process Chemistry and Technology Multiphase flow Mechanics dilution Dilution brine Chemistry Environmental science Air entrainment Aeration outfall |
| Zdroj: | Processes Volume 9 Issue 5 Processes, Vol 9, Iss 856, p 856 (2021) |
| ISSN: | 2227-9717 |
| DOI: | 10.3390/pr9050856 |
| Popis: | Confined plunging jets are investigated as potential outfalls for the discharge of desalination brine. Compared to offshore submerged outfalls that rely on momentum to induce mixing, plunging jets released above the water surface utilize both momentum and negative buoyancy. Plunging jets also introduce air into the water column, which can reduce the possibility of hypoxic zones. In contrast to unconfined plunging jets, confined plunging jets include a confining tube, or downcomer, around the jet, which increases the penetration depth of the bubbles and can provide better aeration. However, the presence of this downcomer can hinder mixing with surrounding water. Therefore, laboratory measurements of dilution are reported here and compared to the dilution of unconfined plunging jets. In addition, qualitative observations of bubble penetration depth are also used to discuss aeration potential. For designs that increase the bubble penetration depth as compared to unconfined plunging jets, results show that dilution decreases as the depth of the downcomer is increased. However, it is shown that confined plunging jets can be designed with a short downcomer to provide higher dilution than unconfined jets. The effect of the diameter of downcomer on dilution is also investigated and a non-monotonic effect is observed. |
| Databáze: | OpenAIRE |
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