In-situ observation of phase separation dynamics for immiscible aqueous solution within ultrasonic field
A high-speed imaging technique was used to observe the phase separation process of water (H2O)-20 %succinonitrile (SCN) immiscible solution within ultrasound field. Combining with numerical simulation, the effects of ultrasonic cavitation and acoustic streaming on the fragmentation and migration of...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-11-01
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| Series: | Ultrasonics Sonochemistry |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1350417723003462 |
| _version_ | 1797662122783539200 |
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| author | Ying Zhang Wenhua Wu Jianyuan Wang Wei Zhai Bingbo Wei |
| author_facet | Ying Zhang Wenhua Wu Jianyuan Wang Wei Zhai Bingbo Wei |
| author_sort | Ying Zhang |
| collection | DOAJ |
| description | A high-speed imaging technique was used to observe the phase separation process of water (H2O)-20 %succinonitrile (SCN) immiscible solution within ultrasound field. Combining with numerical simulation, the effects of ultrasonic cavitation and acoustic streaming on the fragmentation and migration of secondary droplets were revealed. It was found that the previously spherical or near-spherical secondary H2O-rich droplets formed under static condition were dynamically transformed into several novel forms, such as tadpole-like, string-beads, gourd-like, and threadlike patterns. The calculated results showed that the cavitation could fragment micron-scale H2O-rich droplets because of the produced higher shock wave pressure than the droplets’ Laplace pressure, and the subsequent droplet morphology evolution mainly depended on the liquid ejection volume determined by the distance between the droplets and the collapsing bubbles. Meanwhile, acoustic streaming, which generated shear force exceeding the surface tension of H2O-rich phase, stretched, split and finally fractured millimeter-sized or even larger secondary droplets into several smaller spherical sub-droplets. In comparison, the observed secondary droplet distribution characteristics in H2O-20 %SCN solution were similar to the Bi-rich particles in the ultrasonic solidification microstructures of Al-30 %Bi immiscible alloy, confirming that this work provided a deep understanding of the liquid phase separation mechanism within ultrasonic field. |
| first_indexed | 2024-03-11T18:55:31Z |
| format | Article |
| id | doaj.art-5817e88f2751406e99658ace29454956 |
| institution | Directory Open Access Journal |
| issn | 1350-4177 |
| language | English |
| last_indexed | 2024-03-11T18:55:31Z |
| publishDate | 2023-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Ultrasonics Sonochemistry |
| spelling | doaj.art-5817e88f2751406e99658ace294549562023-10-11T04:43:11ZengElsevierUltrasonics Sonochemistry1350-41772023-11-01100106634In-situ observation of phase separation dynamics for immiscible aqueous solution within ultrasonic fieldYing Zhang0Wenhua Wu1Jianyuan Wang2Wei Zhai3Bingbo Wei4School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, PR ChinaSchool of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, PR ChinaSchool of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, PR ChinaCorresponding author.; School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, PR ChinaSchool of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, PR ChinaA high-speed imaging technique was used to observe the phase separation process of water (H2O)-20 %succinonitrile (SCN) immiscible solution within ultrasound field. Combining with numerical simulation, the effects of ultrasonic cavitation and acoustic streaming on the fragmentation and migration of secondary droplets were revealed. It was found that the previously spherical or near-spherical secondary H2O-rich droplets formed under static condition were dynamically transformed into several novel forms, such as tadpole-like, string-beads, gourd-like, and threadlike patterns. The calculated results showed that the cavitation could fragment micron-scale H2O-rich droplets because of the produced higher shock wave pressure than the droplets’ Laplace pressure, and the subsequent droplet morphology evolution mainly depended on the liquid ejection volume determined by the distance between the droplets and the collapsing bubbles. Meanwhile, acoustic streaming, which generated shear force exceeding the surface tension of H2O-rich phase, stretched, split and finally fractured millimeter-sized or even larger secondary droplets into several smaller spherical sub-droplets. In comparison, the observed secondary droplet distribution characteristics in H2O-20 %SCN solution were similar to the Bi-rich particles in the ultrasonic solidification microstructures of Al-30 %Bi immiscible alloy, confirming that this work provided a deep understanding of the liquid phase separation mechanism within ultrasonic field.http://www.sciencedirect.com/science/article/pii/S1350417723003462UltrasoundCavitation effectAcoustic streaming effectImmiscible alloySecondary droplet |
| spellingShingle | Ying Zhang Wenhua Wu Jianyuan Wang Wei Zhai Bingbo Wei In-situ observation of phase separation dynamics for immiscible aqueous solution within ultrasonic field Ultrasonics Sonochemistry Ultrasound Cavitation effect Acoustic streaming effect Immiscible alloy Secondary droplet |
| title | In-situ observation of phase separation dynamics for immiscible aqueous solution within ultrasonic field |
| title_full | In-situ observation of phase separation dynamics for immiscible aqueous solution within ultrasonic field |
| title_fullStr | In-situ observation of phase separation dynamics for immiscible aqueous solution within ultrasonic field |
| title_full_unstemmed | In-situ observation of phase separation dynamics for immiscible aqueous solution within ultrasonic field |
| title_short | In-situ observation of phase separation dynamics for immiscible aqueous solution within ultrasonic field |
| title_sort | in situ observation of phase separation dynamics for immiscible aqueous solution within ultrasonic field |
| topic | Ultrasound Cavitation effect Acoustic streaming effect Immiscible alloy Secondary droplet |
| url | http://www.sciencedirect.com/science/article/pii/S1350417723003462 |
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