eprintid: 10199959
rev_number: 9
eprint_status: archive
userid: 699
dir: disk0/10/19/99/59
datestamp: 2024-11-12 08:36:12
lastmod: 2024-11-12 08:36:12
status_changed: 2024-11-12 08:36:12
type: article
metadata_visibility: show
sword_depositor: 699
creators_name: Drähne, Ulrike
creators_name: Ducci, Andrea
creators_name: Czerski, Helen
title: Bubble fragmentation in turbulent flow and the potential implications of shear structures for bubbles formed by breaking waves
ispublished: pub
divisions: UCL
divisions: B04
divisions: F45
note: Copyright © 2024 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
abstract: Large bubbles (1–5 mm radius) are important in a wide range of situations, including air-sea gas transfer, aerosol production as they burst at water surfaces, and the aeration of liquids in bioreactors and other industrial processes. When rising through turbulent flow, these bubbles are commonly distorted and may fragment to form daughter bubbles if their radius exceeds the Hinze scale (at which the restoring force due to surface tension is equal to the forces causing bubble distortion). Here, we present the results of laboratory experiments with fragmentation resulting from bubbles rising through a sheared and turbulent flow. The effects of water temperature, surface tension, local shear rate, and viscous dissipation rate of turbulent kinetic energy were assessed. Passive acoustical methods produce robust measurements of bubble fragmentation processes, allowing for rapid data collection to generate large data sets. In our experiments, even for bubbles very close to the Hinze scale, the dominant fragmentation mechanism is the capillary-driven fragmentation of elongated bubble filaments. The probability distribution of daughter bubble sizes from a single fragmentation event was independent of temperature, surface tension, and rate of viscous dissipation of turbulent kinetic energy. The overwhelming majority of fragmentation events resulted in one very large and one very small bubble, even for Hinze-scale parent bubbles and low Weber numbers (We < 5.3). Our results suggest that in a turbulent flow, there may be a link between the shear induced by large scale structures and the size of the smallest bubbles produced underneath a breaking wave.
date: 2024-11
date_type: published
publisher: AIP Publishing
official_url: http://dx.doi.org/10.1063/5.0232421
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 2334639
doi: 10.1063/5.0232421
lyricists_name: Ducci, Andrea
lyricists_name: Czerski, Helen
lyricists_id: ADUCC64
lyricists_id: HCZER87
actors_name: Czerski, Helen
actors_id: HCZER87
actors_role: owner
full_text_status: public
publication: Physics of Fluids
volume: 36
number: 11
article_number: 113329
issn: 1070-6631
citation:        Drähne, Ulrike;    Ducci, Andrea;    Czerski, Helen;      (2024)    Bubble fragmentation in turbulent flow and the potential implications of shear structures for bubbles formed by breaking waves.                   Physics of Fluids , 36  (11)    , Article 113329.  10.1063/5.0232421 <https://doi.org/10.1063/5.0232421>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10199959/1/Czerski_113329_1_5.0232421.pdf