Boulder-flow interaction associated with self-aeration process

Kucukali S., Çokgör Ş.

JOURNAL OF HYDRAULIC RESEARCH, cilt.46, sa.3, ss.415-419, 2008 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 46 Sayı: 3
  • Basım Tarihi: 2008
  • Doi Numarası: 10.3826/jhr.2008.3105
  • Dergi Adı: JOURNAL OF HYDRAULIC RESEARCH
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.415-419
  • İstanbul Teknik Üniversitesi Adresli: Hayır

Özet

In this experimental Study, the boulder-flow interaction associated with the self-aeration process was investigated in a 0.50 m wide flume. Experiments were performed with three different boulder arrangements and four different relative boulder submergences using Reynolds numbers from 5 x 10(3) to 5 x 10(4). A boulder-flow interaction can trigger air-water mass transfer by generating turbulence, a hydraulic jump and plunging jet flow. When the boulders are submerged by the water, the maximum local aeration efficiency tends to decrease rapidly as does the flow resistance. Furthermore, the maximum local aeration efficiency is positively related to the blockage ratio of the boulder(s). The blockage ratio appears to represent the head loss, suggesting a possible interrelation between the aeration efficiency and the energy dissipation.