Ultrasound induced grain refinement of crystallization in evaporative saline droplets

Xiaoqiang Zhang; Hongyue Chen; Yuhan Wang; Xin Gao; Zhijun Wang; Nan Wang; Duyang Zang

Ultrasonics Sonochemistry (Jul 2024)

Ultrasound induced grain refinement of crystallization in evaporative saline droplets

Xiaoqiang Zhang,
Hongyue Chen,
Yuhan Wang,
Xin Gao,
Zhijun Wang,
Nan Wang,
Duyang Zang

Affiliations

Xiaoqiang Zhang: MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary Conditions, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, China; Shaanxi Liquid Physics Research Center, Xi’an 710129, China
Hongyue Chen: MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary Conditions, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, China; Shaanxi Liquid Physics Research Center, Xi’an 710129, China
Yuhan Wang: MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary Conditions, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, China; Shaanxi Liquid Physics Research Center, Xi’an 710129, China
Xin Gao: Nanjing Sonodrive Technology Co., Ltd., Nanjing 210034, China
Zhijun Wang: State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
Nan Wang: MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary Conditions, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, China
Duyang Zang: MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary Conditions, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, China; Shaanxi Liquid Physics Research Center, Xi’an 710129, China; Corresponding author at: MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary Conditions, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, China.

Journal volume & issue: Vol. 107
p. 106938

Abstract

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We investigate the effect of ultrasound on the evaporation and crystallization of sessile NaCl solution droplets which were positioned in traveling or standing wave ultrasound field. The experimental results indicated that the ultrasound field can significantly accelerate the evaporation rate of the sessile droplets and refine the crystal grains. By adjusting the distance between the sessile droplets and the ultrasound emitter, it is found that, in traveling wave ultrasound field, the sessile droplet evaporation time and the time for the appearance of NaCl grains exhibited a fluctuating increase as the droplet-emitter distance increased. While in the standing wave ultrasound, the sessile droplet evaporation rate increases with the increasing droplet-emitter distance. Overall, the traveling wave ultrasound field has a stronger effect on grain refinement of the sessile droplets than the standing wave ultrasound field. The grain refinement is attributed to the decrease of critical nucleation radius caused by ultrasound energy and the increase of the nucleation rate caused by the accelerated evaporation rate. In addition, the breakage of grains caused by ultrasonic cavitation would also lead to grain refinement.

Published in Ultrasonics Sonochemistry

ISSN: 1350-4177 (Print); 1873-2828 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Chemistry; Science: Physics: Acoustics. Sound
Website: https://www.journals.elsevier.com/ultrasonics-sonochemistry

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