Icing kinetics and mechanism of droplet impinging on supercooled corrugated plates with different curvature

doi:10.11949/0438-1157.20221591

Abstract

Abstract:

CLSVOF method and enthalpy-porosity method were coupled to carry out a parametric analysis on icing behaviors of single droplet impinging on supercooled corrugated plates with different curvature and various Weber number. The inner mechanism of differences among kinetic behaviors of droplet contraction, oscillation and fragmentation during droplet impaction was focused on, considering two substrates: single-row corrugated plate and double-row corrugated plate with different curvature. The influence law of supercooling and impingement on freezing interface evolution rate was explored. Simulation results showing: droplet impact icing dynamics was the results coupled of fluid disorder characteristics and time-varying characteristics of heat transfer boundary. The Rayleigh-Taylor instability appears in the droplet spreading leading edge can accelerate droplet freezing during high velocity impaction, interfacial energy transformation caused by droplet breakage can bring up freezing rate decrease. Increasing of supercooling can lead to liquid film fracture obstruction and reduction of droplet circumferential capillary climbing area. Results can supply theoretical reference for microscopic droplet capillarity icing dynamics and its application to anti-icing engineering.

Key words: droplet impinging, various Weber number, freezing phase interface, curvature

摘要：

耦合CLSVOF和焓-多孔介质方法参数化分析了可变Weber数和壁面过冷度对单液滴撞击不同曲率过冷光滑曲面波纹基底的结冰行为。聚焦于液滴粒径固定时，不同曲率单列波纹板和复列波纹板引起的液滴收缩、振荡和破碎的动力学行为差异的作用机理，探究表面过冷度和液滴初速度对结冰相界面推移速率的影响规律。模拟结果表明，液滴撞击结冰动力学是流场紊乱特性和换热边界时变特征耦合作用的结果。高Weber数撞击导致液滴铺展前缘的Rayleigh-Taylor不稳定波加速液滴结冰，后期液滴破碎引起的界面能转化使结冰速率降低。过冷度的增加可阻碍液膜断裂和减少液滴的周向毛细爬升面积。研究结果对微观液滴毛细结冰动力学和防结冰工程化应用提供理论参考。

关键词: 液滴撞击, 变Weber数, 结冰相界面, 基底曲率

CLC Number:

TB 61⁺1

Xiaoqing ZHOU, Chunyu LI, Guang YANG, Aifeng CAI, Jingyi WU. Icing kinetics and mechanism of droplet impinging on supercooled corrugated plates with different curvature[J]. CIESC Journal, 2023, 74(S1): 141-153.

周晓庆, 李春煜, 杨光, 蔡爱峰, 吴静怡. 液滴撞击不同曲率过冷波纹面结冰动力学行为及机理研究[J]. 化工学报, 2023, 74(S1): 141-153.

Figures/Tables 15

Fig.1 Diagram of single row corrugated plate (left) and double row corrugated plate (right)

Table 1 Selection principal of viscosity coefficient Cmush （θ=140°）

过冷度/℃	C_mush
10	5×10⁴
20	1×10⁶

Fig.2 Grid independence verification

Fig.3 Model validity verification

Fig.4 Diagram of icing behavior variables

Fig.5 Droplet impinging on the water-ice interface of a single row of corrugated plates

Fig.6 Droplet impact on the water-ice interface of a complex corrugated plate

Fig.7 Dimensionless extension radius of droplet impacting on single and complex corrugated plates with velocity of 0.5m/s

Fig.8 Coverage diagram and flow field diagram of the icing interface and flow field diagram where droplets impact single and complex corrugated plates at 0.5 m/s (yellow color is employed in the flow field diagram to describe the water phase interface)

Fig.9 Dimensionless spreading radius curve and icing interface coverage curve of droplets impacting on single and complex corrugated plates at 2.0 m/s

Fig.10 Water phase velocity contour of droplets impacting on plates of Ds=3 mm/Dss=3 mm/Ds=5 mm/Dss=5 mm at 2.0 m/s

Fig.11 Ice phase contour of droplets impacting on plates of Ds=5 mm/Dss=5 mm at 2.0 m/s

Fig.12 Droplet behaviors and velocity cloud image of the initial impaction of droplet on corrugated plates with Dss=1 mm/Dss=3 mm/Dss=5 mm at 5.0 m/s

Fig.13 Coverage curve of ice interface of the corrugated plate with Dss=1 mm/Dss=3 mm/Dss=5 mm of droplet impaction at 2.0, 5.0 and 8.0 m/s

Fig.14 Droplet icing coverage and droplet icing behavior of three curvature complex corrugated plates with a subcooling degree of 10℃ and 20℃ impacted by droplet 5.0 m/s

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