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Wang JX, Qian J, Li JX, Wang X, Lei C, Li S, Li J, Zhong M, Mao Y. Enhanced interfacial boiling of impacting droplets upon vibratory surfaces. J Colloid Interface Sci 2024; 658:748-757. [PMID: 38142625 DOI: 10.1016/j.jcis.2023.12.095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Revised: 12/02/2023] [Accepted: 12/14/2023] [Indexed: 12/26/2023]
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.
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Affiliation(s)
- Ji-Xiang Wang
- 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
| | - Jian Qian
- College of Electrical, Energy and Power Engineering, Yangzhou University, Yangzhou 225009, PR China
| | - Jia-Xin Li
- China Academy of Launch Vehicle Technology, Beijing 100076, PR China
| | - Xiong Wang
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, PR China
| | - Chaojie Lei
- Beijing Sino-Spark Technology Co., Ltd., Beijing 100191, PR China
| | - Shengquan Li
- College of Electrical, Energy and Power Engineering, Yangzhou University, Yangzhou 225009, PR China
| | - Jun Li
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, PR China.
| | - Mingliang Zhong
- 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.
| | - Yufeng Mao
- 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.
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