Microbubble and Nanobubble Dynamics

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "A:Physics".

Deadline for manuscript submissions: closed (30 April 2021) | Viewed by 2723

Special Issue Editor

Research Campus STIMULATE, Faculty of Electro- and Information Technology, University of Magdeburg, 39014 Magdeburg, Germany
Interests: bubble dynamics; ultrasound and shock waves; microfluidics; numerical simulations

Special Issue Information

Dear colleagues,

Traditional bubble dynamics studies focus on the cavitation interaction with ship propellers, its dynamics in underwater explosion, and its erosional effects in other industrial applications. Since the development of shock wave lithotripsy for the treatment of kidney stones in the 1980s, bubbles—especially micron-sized or nanoscale ones—have increasingly became a subject of interest for research in the medical and other technological areas. In medicine, micron-sized bubbles which are coated with lipids or polymers, commonly known as ultrasound contrast agents, have been used to image blood flow in the heart and other organs. Attempts have also been made to use these bubbles together with ultrasound or shock waves for drug delivery across the blood–brain barrier, or to detect changes in cell/tissue elasticity. In industries, there are on-going studies to use micro- or nano-sized bubbles for the cleaning of silicon wafers, enhance the floatation process in wastewater treatment, and many other applications. In this Special Issue, we invite authors to submit original manuscripts on the topic of micro- or nano-sized bubbles. Fundamental studies of the bubbles’ properties, theories, and dynamics, as well as applied research on bubble production, manipulation, and interaction with nearby objects or structures are suitable for this Special Issue.

Dr. Siew-Wan Ohl
Guest Editor

Manuscript Submission Information

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Keywords

  • microbubbles
  • nanobubbles
  • bubble interaction
  • ultrasound contrast agent
  • drug delivery
  • cleaning
  • jets

Published Papers (1 paper)

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Research

14 pages, 5775 KiB  
Article
Influence of Bubbles Causing Cavitation on Spool Oscillation of a Direct Drive Servovalve
by Pengda Ren, Bin Wang, Wei Zhang and Zhigang Xie
Micromachines 2021, 12(6), 717; https://doi.org/10.3390/mi12060717 - 18 Jun 2021
Cited by 3 | Viewed by 2060
Abstract
A direct drive servovalve has some inherent benefits over its conventional counterparts, but also has better reliability and output power. However, due to the rigid connection between the spool and the motor, which takes the place of interstage drive-by fluid, the spool oscillation [...] Read more.
A direct drive servovalve has some inherent benefits over its conventional counterparts, but also has better reliability and output power. However, due to the rigid connection between the spool and the motor, which takes the place of interstage drive-by fluid, the spool oscillation is a long-standing unsolved problem. In order to study the oscillation mechanism and the influencing factors, a double-circuit direct drive servovalve was numerically simulated. An oil return valve cavity was concentrated on as the main flow domain and was used to analyze the fluid flow characteristics. Local cavitation fraction and surface average cavitation fraction were defined to evaluate the cavitation situation. The periodic growth process of bubbles in the valve cavity was obtained. The numerical results show that bubbles in the oil return valve cavity changes, although the occurrence, evolution, and collapse stages were certain. The intensity of pressure pulsation caused by bubble variation is highly related to the bubbles causing the cavitation, which suggests a workable way to inhibit the spool oscillation. Full article
(This article belongs to the Special Issue Microbubble and Nanobubble Dynamics)
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