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Investigation of the Dynamics of Cavitation Bubbles in a Microfluidic Channel with Actuations

This work presents experimental and numerical studies on the dynamics of cavitation bubbles in a nozzle-shaped microfluidic channel with PZT (lead-zirconate-titanate) actuations. It is found that a cloud of bubbles can be generated near the center of the microfluidic channel when the actuation volta...

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Detalles Bibliográficos
Autores principales: Shang, Xiaopeng, Huang, Xiaoyang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8879870/
https://www.ncbi.nlm.nih.gov/pubmed/35208327
http://dx.doi.org/10.3390/mi13020203
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author Shang, Xiaopeng
Huang, Xiaoyang
author_facet Shang, Xiaopeng
Huang, Xiaoyang
author_sort Shang, Xiaopeng
collection PubMed
description This work presents experimental and numerical studies on the dynamics of cavitation bubbles in a nozzle-shaped microfluidic channel with PZT (lead-zirconate-titanate) actuations. It is found that a cloud of bubbles can be generated near the center of the microfluidic channel when the actuation voltage is larger than a threshold at 1 kHz. After being generated, the bubbles under actuations oscillate radially with violent expansion and compression, and simultaneously translate upstream towards the opening of the nozzle. Along with radial oscillation and translation, the bubbles undergo frequent and drastic coalescence and breakup, leading to vigorous churning of surrounding liquids. The pressure variation and distribution in the microchannel are calculated by numerical simulation in Ansys Fluent, and results show that there is a low-pressure zone inside the microfluidic channel within each cycle of the actuation period, which is responsible for bubble generation observed in the experiments. The method of bubble generation in this study is novel and can be applied for the enhancement of heat and mass transfer in microfluidic operations.
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spelling pubmed-88798702022-02-26 Investigation of the Dynamics of Cavitation Bubbles in a Microfluidic Channel with Actuations Shang, Xiaopeng Huang, Xiaoyang Micromachines (Basel) Article This work presents experimental and numerical studies on the dynamics of cavitation bubbles in a nozzle-shaped microfluidic channel with PZT (lead-zirconate-titanate) actuations. It is found that a cloud of bubbles can be generated near the center of the microfluidic channel when the actuation voltage is larger than a threshold at 1 kHz. After being generated, the bubbles under actuations oscillate radially with violent expansion and compression, and simultaneously translate upstream towards the opening of the nozzle. Along with radial oscillation and translation, the bubbles undergo frequent and drastic coalescence and breakup, leading to vigorous churning of surrounding liquids. The pressure variation and distribution in the microchannel are calculated by numerical simulation in Ansys Fluent, and results show that there is a low-pressure zone inside the microfluidic channel within each cycle of the actuation period, which is responsible for bubble generation observed in the experiments. The method of bubble generation in this study is novel and can be applied for the enhancement of heat and mass transfer in microfluidic operations. MDPI 2022-01-28 /pmc/articles/PMC8879870/ /pubmed/35208327 http://dx.doi.org/10.3390/mi13020203 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Shang, Xiaopeng
Huang, Xiaoyang
Investigation of the Dynamics of Cavitation Bubbles in a Microfluidic Channel with Actuations
title Investigation of the Dynamics of Cavitation Bubbles in a Microfluidic Channel with Actuations
title_full Investigation of the Dynamics of Cavitation Bubbles in a Microfluidic Channel with Actuations
title_fullStr Investigation of the Dynamics of Cavitation Bubbles in a Microfluidic Channel with Actuations
title_full_unstemmed Investigation of the Dynamics of Cavitation Bubbles in a Microfluidic Channel with Actuations
title_short Investigation of the Dynamics of Cavitation Bubbles in a Microfluidic Channel with Actuations
title_sort investigation of the dynamics of cavitation bubbles in a microfluidic channel with actuations
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8879870/
https://www.ncbi.nlm.nih.gov/pubmed/35208327
http://dx.doi.org/10.3390/mi13020203
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