Transactions of Nanjing University of Aeronautics & Astronautics
Design Principle of Mixed-Wettability Surfaces for Inducing Droplet Directional Rebound
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Abstract:
Directional rebound of droplet impacting on solid surfaces is of great significance in engineering applications such as anti-icing/fogging and self-cleaning. Mixed-wettability surfaces have been shown to be as an effective way for droplet manipulation. The impact of droplet on hydrophobic substrate decorated with a hydrophilic stripe is investigated numerically. The validated diffuse interface method is adopted for interface capture. First， the formation of satellite droplets during the impact process is explored， and the role of mixed-wettability surfaces in the droplet spreading， retraction and rebound stages is clarified by analyzing the vertical and lateral velocities of the droplet. After that， the effect of the stripe width on the droplet rebound form and the contact time is studied systematically. Special attention is paid to the mechanisms of dynamics and energy transfer during the evolution of liquid film and droplet bouncing. The obtained results can provide useful guidance for the design of mixed-wettability surfaces and further optimize the control of droplet directional rebound.
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This work was supported by the Foundation of National Key Laboratory of Science and Technology on Aerodynamic Design and Research （No.D5150230003）， the Open Fund of Key Laboratory of Flight Techniques and Flight Safety， CAAC （No.FZ2021KF20）， and the Priority Academic Program Development of Jiangsu Higher Education Institutions （PAPD）.
Clc Number:
O35
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