振动对液滴撞击壁面铺展特性的影响

doi:10.7527/S1000-6893.2022.27911

Abstract

Abstract:

During the spray cooling in aerospace field， the devices need to be cooled are in a constant state of vibration. It is significant to study the effects of vibration on droplet impacting behaviors of spray cooling. Based on the Volume of Fluid （VOF） method and the dynamic mesh model， the numerical model of droplet impacting on vertical simple harmonic vibrating solid surface was established， and the effects of vibration amplitude， frequency and initial phase angle on the spreading characteristics were analyzed. The results showed that， under the same impact condition， the surface vibration not only affects the maximum spreading factor and the spreading time， but also causes the fracture suppression and splashing behaviors of film. When the initial phase angle is 0°， the spreading time decreases with the increase of amplitude and frequency， and the maximum spreading factor increases with the increase of amplitude. When the amplitude is small， the maximum spreading factor increases first and then decreases with the increase of frequency， the maximum value is obtained at the resonant frequency and the degree of decrease gradually decreases with the increase of amplitude. When the amplitude is large， the maximum spreading factor becomes increasing with the increase of frequency. The trend of the spreading time and the maximum spreading factor with the initial phase angle is mainly related to the frequency. When the frequency is small， the initial phase angle has no significant influence on the spreading time and the maximum spreading factor. With the increase of frequency， the phase of spreading time is maximum at 180° and 90° successively， and the phase of maximum spreading factor is maximum at 0° and 180° successively.

Key words: droplet impact, surface vibration, spreading characteristics, dynamic behavior, spreading factor

CLC Number:

V245.3

Shaokai ZHU, Dinghua HU, Qiang LI. Effects of vibration on spreading characteristics of droplet impacting on surface[J]. Acta Aeronautica et Astronautica Sinica, 2023, 44(16): 127911-127911.

Figures/Tables 13

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Effects of vibration on spreading characteristics of droplet impacting on surface

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