Bubble Dynamics

A special issue of Fluids (ISSN 2311-5521).

Deadline for manuscript submissions: closed (30 November 2023) | Viewed by 4688

Special Issue Editors


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Guest Editor
Ocean Engineering and Transport Systems, University of Duisburg-Essen, 47057 Duisburg, Germany
Interests: cavitation control; hydrodynamic cavitation; cavitation-induced erosion; noise and vibration; computational fluid dynamics; experimental fluid mechanics
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E-Mail Website
Guest Editor
Institute of Ship Technology, Ocean Engineering and Transport Systems, Department of Mechanical and Process Engineering, University of Duisburg-Essen, 47057 Duisburg, Germany
Interests: fluid dynamics; offshore structures; fluid–structure interaction
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The collapse of cavitation bubbles is mostly known due to its negative effects on marine and hydraulic machinery systems, such as erosion, noise and vibrations. In addition, cavitation bubbles have positive effects, such as cleaning surfaces, the inactivation of bacteria or synthetizing chemical substances. This Special Issue on Bubble Dynamics is focused on the recent advances in numerical and experimental works that help us to increase our understanding of cavitation bubble dynamics. The planned topics include (but are not limited to) the following areas: bubble dynamics, laser- and spark-induced bubbles, acoustic cavitation bubbles, cavitation-induced erosion and noise, cavitation control, thermal effects, nanobubbles and cavitation exploitation.

Dr. Ebrahim Kadivar
Prof. Dr. Bettar Ould el Moctar
Guest Editors

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Keywords

  • numerical simulation
  • experimental measurements
  • bubble dynamics
  • laser-induced bubble
  • spark-induced bubble
  • acoustic cavitation bubble
  • hydrodynamic cavitation
  • erosion and noise
  • cavitation control
  • thermal effects
  • nanobubbles
  • cavitation exploitation

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Published Papers (1 paper)

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Research

16 pages, 11010 KiB  
Article
Nanobubble Collapse Induced Erosion near Flexible and Rigid Boundaries: A Molecular Dynamics Study
by Ebrahim Kadivar, Ali Rajabpour and Ould El Moctar
Fluids 2023, 8(5), 154; https://doi.org/10.3390/fluids8050154 - 14 May 2023
Cited by 8 | Viewed by 2435
Abstract
In this work, we performed molecular dynamics simulations to study the dynamics of a shock wave-induced single nanobubble collapsing near one flexible and two rigid boundaries. The flexible boundary consisted of polyethylene, and the rigid boundaries were made of aluminum and iron. The [...] Read more.
In this work, we performed molecular dynamics simulations to study the dynamics of a shock wave-induced single nanobubble collapsing near one flexible and two rigid boundaries. The flexible boundary consisted of polyethylene, and the rigid boundaries were made of aluminum and iron. The shock waves impinging on the nanobubble inside a molecular system were generated using a momentum mirror approach. For two relative wall distances, we studied the dynamics of the shock-induced single nanobubble and its collapse near the flexible and the rigid boundaries. The atomic velocity contours surrounding the single nanobubble and the collapse-induced damage on the boundaries were analyzed. We obtained this collapse-induced damage from ten collapsing nanobubbles. Results showed that the relative wall distance affected the single nanobubble’s collapse dynamics near the boundaries. A generated nanojet was directed on the surfaces during the collapse process. From the collapse-induced damage point of view, the depth damage of the polyethylene, iron, and aluminum boundaries for the relative wall distance of γ = 1.3 were 6.0, 0.47 and 0.63 nm, respectively. It was observed that the extensive collapse-induced damage occurred only on the polyethylene boundary. Full article
(This article belongs to the Special Issue Bubble Dynamics)
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