Enhanced interfacial boiling of impacting droplets upon vibratory surfaces

Ji-Xiang Wang; Jian Qian; Jia-Xin Li; Xiong Wang; Chaojie Lei; Shengquan Li; Jun Li; Mingliang Zhong; Yufeng Mao

doi:10.1016/j.jcis.2023.12.095

Enhanced interfacial boiling of impacting droplets upon vibratory surfaces

J Colloid Interface Sci. 2024 Mar 15:658:748-757. doi: 10.1016/j.jcis.2023.12.095. Epub 2023 Dec 19.

Authors

Ji-Xiang Wang¹, Jian Qian², Jia-Xin Li³, Xiong Wang⁴, Chaojie Lei⁵, Shengquan Li², Jun Li⁶, Mingliang Zhong⁷, Yufeng Mao⁸

Affiliations

¹ College of Electrical, Energy and Power Engineering, Yangzhou University, Yangzhou 225009, PR China; Hebei Key Laboratory of Man-machine Environmental Thermal Control Technology and Equipment, Hebei Vocational University of Technology and Engineering, Hebei 054000, PR China; Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, PR China; Taizhou Wavexploration Energy Ltd., Taizhou, 225513, PR China.
² College of Electrical, Energy and Power Engineering, Yangzhou University, Yangzhou 225009, PR China.
³ China Academy of Launch Vehicle Technology, Beijing 100076, PR China.
⁴ Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, PR China.
⁵ Beijing Sino-Spark Technology Co., Ltd., Beijing 100191, PR China.
⁶ School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, PR China. Electronic address: lijun830@126.com.
⁷ Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, PR China; National Key Laboratory of Optical Field Manipulation Science and Technology, Chinese Academy of Sciences, Chengdu 610209, PR China. Electronic address: zhong.mingliang@ioe.ac.cn.
⁸ College of Electrical, Energy and Power Engineering, Yangzhou University, Yangzhou 225009, PR China; Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, PR China; National Key Laboratory of Optical Field Manipulation Science and Technology, Chinese Academy of Sciences, Chengdu 610209, PR China. Electronic address: maoyf@ioe.ac.cn.

PMID: 38142625
DOI: 10.1016/j.jcis.2023.12.095

Abstract

Hypothesis: Despite the flourishing studies of droplet interfacial boiling, the boiling upon vibratory surfaces, which may cause vigorous liquid-vapor-solid interactions, has rarely been investigated. Enhanced boiling normally can be gained from rapid removal of vapor and disturbance of liquid-vapor interface. We hypothesize that the vibratory surfaces enhance both effects with new intriguing phenomena and thus, attain an enhanced boiling heat transfer.

Experiments: We experimentally investigated the impacting fluid dynamics and coupled heat transfer patterns of multiple droplets and a single droplet impinging on still and vibratory surfaces of various materials and different wettability.

Findings: The boiling under vibratory surfaces with increased vibration velocity amplitude and enhanced wettability can be enhanced by 80% in heat transfer coefficient and Nusselt number, which is attributed to several reasons: shortened bubble lifespan, thinner and smaller bubbles, and enhanced disturbances in liquid-vapor interfaces. The vibration also delays the Leidenfrost point when the droplet impacts a descending surface, which shows that the droplet impact moment (vibration phase angle) is particularly crucial. The descending surface releases the generated vapor actively and facilitates liquid-solid contact, thereby delaying the Leidenfrost. From fundamentals to application, this article strengthens our understanding of vibrated interfacial boiling in scenarios closer to multiple natural processes and practical industries.

Keywords: Droplet impact; Interfacial boiling; Multiphase fluid dynamics; Vibration.