Transactions of Nanjing University of Aeronautics & Astronautics
Numerical Simulation of Double-Droplet Continuously Impact on Cold Surface with Different Wettability
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Abstract:
The numerical simulation method combining solidification/melting model and volume of fluid （VOF） model is used to study the freezing behavior of double-droplet continuously impacting cold surfaces with varying wettability under low-velocity conditions. The droplet spreading and phase transition processes under two contact modes （diffusion contact and contraction contact） are compared. The simulation results indicate that the coalescence of droplets has a significant impact on their morphology. When two droplets continuously impact the hydrophilic surface， the maximum spreading factor of diffusion contact increases by 26%—38% compared with that of a single droplet impact， and the maximum spreading factor of contraction contact increases by 15%—30% compared with that of a single droplet impact. On superhydrophobic surfaces， the maximum spreading coefficient difference between single and double-droplet impacts is less than 2%， which can be ignored. In addition， an analysis is conducted on the collision between double droplets and superhydrophobic surfaces at low temperatures， and the impact patterns of complete rebound， partial rebound， and full adhesion on droplet aggregation and solidification processes under different contact modes are obtained.
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Project Supported:
This work was supported by the Open Fund of Key Laboratory of Icing and Anti/De-icing （No. IADL20190311）.
Clc Number:
V211.1
CHINA AERO-SCIENCES
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