Laboratory measurement of void fraction under a breaking solitary wave in the surf zone

Lian Tang, Yun Ta Wu, O. W.H. Wai, Pengzhi Lin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The temporal and spatial variations of the void fraction under a breaking solitary wave on a 1:20 sloping beach was investigated through laboratory measurement. The fiber optic reflectometer (FOR) was applied to measure the instantaneous void fraction inside the bubble plume in the experiment. A high-speed camera was used to capture the whole process of the bubbly flow passing through the region where the FOR instrumented. The void fraction distributions in the splash up and cavity areas were well captured by the FOR technique in the experiment. The measured maximum ensemble averaged void fraction occurred in the collapsing cavity area with the maximum value of 65% after wave broke. The ensemble averaged void fraction was more than 20% in the fully mixed region in the surf zone and sustained for a long duration of time. The time series of the measured ensemble averaged void fraction had good synchronization with the instantaneous images taken by high speed camera, so that the correlation between fluid density and velocity variations can be further investigated.

Original languageEnglish
Title of host publicationAPAC 2019 - Proceedings of the 10th International Conference on Asian and Pacific Coasts
EditorsNguyen Trung Viet, Tran Thanh Tung, Dou Xiping
PublisherSpringer
Pages823-828
Number of pages6
ISBN (Print)9789811502903
DOIs
Publication statusPublished - 2020
Event10th International Conference on Asian and Pacific Coasts, APAC 2019 - Hanoi, Viet Nam
Duration: 2019 Sep 252019 Sep 28

Publication series

NameAPAC 2019 - Proceedings of the 10th International Conference on Asian and Pacific Coasts

Conference

Conference10th International Conference on Asian and Pacific Coasts, APAC 2019
Country/TerritoryViet Nam
CityHanoi
Period19-09-2519-09-28

All Science Journal Classification (ASJC) codes

  • Aquatic Science
  • Ecology, Evolution, Behavior and Systematics
  • Ecology

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