Please use this identifier to cite or link to this item:
http://hdl.handle.net/10397/70912
| Title: | Labyrinthine instabilities of miscible magnetic fluids in a rotating Hele-Shaw cell | Authors: | Chen, MY Chen, LQ Li, HH Wen, CY |
Issue Date: | 2017 | Source: | Physics of fluids, 2017, v. 29, no. 2, 24109, p. 024109-1-024109-13 | Abstract: | This study presents the first experimental results of confining miscible magnetic fluids in a rotating Hele-Shaw cell. Variations in the prominence of labyrinthine instabilities are observed under a range of experimental conditions, with different magnetic field strengths, gap depths, and rotation speeds. These instabilities are characterized by two modified Peclect numbers, namely, Pe(m) (the ratio of the characteristic magnetic advection rate and the diffusion rate) and Pe(C) (the ratio of characteristic rotation advection and the diffusion rate). The magnetic effect is characterized by dipolar repulsion, which triggers a distinctive fingering pattern differing from the progressive diffusion pattern that occurs without magnetic fields or rotation. Under the same rotation speed, the magnetoviscous effect will hinder the growth rate of the magnetic drops at the later stage. However, both the rotation effect and the gap depth greatly enhance the growth rate of the magnetic drops, as these conditions help to intensify the labyrinthine instabilities. In contrast, the countering pressure gradient produces an opposite force that constrains the trend toward expansion. Two major phases in the growth of instabilities are defined: a magnetization phase and a rotation phase, which are dominated by the magnetic and the rotation effect, respectively. The significance of the rotation effect is confirmed by the linear regression between the rotation growth rate and Pec. Finally, main fingering structures that evolve from the secondary waves are verified as having a wavelength lambda to gap depth h relation of lambda approximate to (7 +/- 1) h. Published by AIP Publishing. | Publisher: | American Institute of Physics | Journal: | Physics of fluids | ISSN: | 1070-6631 | EISSN: | 1089-7666 | DOI: | 10.1063/1.4976720 | Rights: | © 2017 Author(s). This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in M. Y. Chen et al., Phys. Fluids 29, 24109 (2017) and may be found at https://dx.doi.org/10.1063/1.4976720 |
| Appears in Collections: | Journal/Magazine Article |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| Chen_Labyrinthine_Instabilities_Miscible.pdf | 13.43 MB | Adobe PDF | View/Open |
Access
View full-text via PolyU eLinks 
Page views
66
Last Week
1
1
Last month
Citations as of Jun 4, 2023
Downloads
106
Citations as of Jun 4, 2023
SCOPUSTM
Citations
4
Last Week
0
0
Last month
Citations as of Jun 8, 2023
WEB OF SCIENCETM
Citations
4
Last Week
0
0
Last month
Citations as of Jun 8, 2023
Google ScholarTM
Check
Altmetric
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.