Shearing flow from transient bubble oscillations in narrow gaps
The flow driven by a rapidly expanding and collapsing cavitation bubble in a narrow cylindrical gap is studied with the volume of fluid method. The simulations reveal a developing plug flow during the early expansion followed by flow reversal at later stages. An adverse pressure gradient leads to bo...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2018
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| Online Access: | https://hdl.handle.net/10356/86026 http://hdl.handle.net/10220/45374 |
| _version_ | 1826123329194426368 |
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| author | Mohammadzadeh, Milad Li, Fenfang Ohl, Claus-Dieter |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Mohammadzadeh, Milad Li, Fenfang Ohl, Claus-Dieter |
| author_sort | Mohammadzadeh, Milad |
| collection | NTU |
| description | The flow driven by a rapidly expanding and collapsing cavitation bubble in a narrow cylindrical gap is studied with the volume of fluid method. The simulations reveal a developing plug flow during the early expansion followed by flow reversal at later stages. An adverse pressure gradient leads to boundary layer separation and flow reversal, causing large shear stress near the boundaries. Analytical solution to a planar pulsating flow shows qualitative agreement with the CFD results. The shear stress close to boundaries has implications to deformable objects located near the bubble: Experiments reveal that thin, flat biological cells entrained in the boundary layer become stretched, while cells with a larger cross section are mainly transported with the flow. |
| first_indexed | 2024-10-01T06:02:52Z |
| format | Journal Article |
| id | ntu-10356/86026 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:02:52Z |
| publishDate | 2018 |
| record_format | dspace |
| spelling | ntu-10356/860262023-02-28T19:23:37Z Shearing flow from transient bubble oscillations in narrow gaps Mohammadzadeh, Milad Li, Fenfang Ohl, Claus-Dieter School of Physical and Mathematical Sciences Cavitation Microscale Flows The flow driven by a rapidly expanding and collapsing cavitation bubble in a narrow cylindrical gap is studied with the volume of fluid method. The simulations reveal a developing plug flow during the early expansion followed by flow reversal at later stages. An adverse pressure gradient leads to boundary layer separation and flow reversal, causing large shear stress near the boundaries. Analytical solution to a planar pulsating flow shows qualitative agreement with the CFD results. The shear stress close to boundaries has implications to deformable objects located near the bubble: Experiments reveal that thin, flat biological cells entrained in the boundary layer become stretched, while cells with a larger cross section are mainly transported with the flow. Published version 2018-07-30T06:21:45Z 2019-12-06T16:14:37Z 2018-07-30T06:21:45Z 2019-12-06T16:14:37Z 2017 Journal Article Mohammadzadeh, M., Li, F.,& Ohl, C.-D. (2017). Shearing flow from transient bubble oscillations in narrow gaps. Physical Review Fluids, 2(1), 014301-. https://hdl.handle.net/10356/86026 http://hdl.handle.net/10220/45374 10.1103/PhysRevFluids.2.014301 en Physical Review Fluids © 2017 American Physical Society (APS). This paper was published in Physical Review Fluids and is made available as an electronic reprint (preprint) with permission of American Physical Society (APS). The published version is available at: [http://dx.doi.org/10.1103/PhysRevFluids.2.014301]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law. 13 p. application/pdf |
| spellingShingle | Cavitation Microscale Flows Mohammadzadeh, Milad Li, Fenfang Ohl, Claus-Dieter Shearing flow from transient bubble oscillations in narrow gaps |
| title | Shearing flow from transient bubble oscillations in narrow gaps |
| title_full | Shearing flow from transient bubble oscillations in narrow gaps |
| title_fullStr | Shearing flow from transient bubble oscillations in narrow gaps |
| title_full_unstemmed | Shearing flow from transient bubble oscillations in narrow gaps |
| title_short | Shearing flow from transient bubble oscillations in narrow gaps |
| title_sort | shearing flow from transient bubble oscillations in narrow gaps |
| topic | Cavitation Microscale Flows |
| url | https://hdl.handle.net/10356/86026 http://hdl.handle.net/10220/45374 |
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