Simulation of Droplet Impact on Cable Surfaces with Different Contact Angles

doi:10.19596/j.cnki.1001-246x.8717

Abstract

Abstract:

Icing of transmission lines will have a negative impact on the safety of line operation and human production and life. The research on anti-icing has gradually developed from the early active anti-icing to the present passive anti-icing, but the passive anti-icing research mostly stays on the improvement of hydrophobicity without in-depth exploration of its anti-icing principle. For common droplet transmission cables, the corresponding calculation model is built. The relationship between the contact time, spreading radius and contact angle between droplet and cable is discussed by using the built-in VOF of Fluent to calculate different hydrophobic surfaces, and the pressure nephogram and velocity vector diagram of droplet under different contact angles are analyzed. The simulation results show that the motion state of the droplet contact with the wall is affected by the wall contact angle, and the spread area and contact time of the droplet are inversely proportional to the wall contact angle. Increasing the wall contact angle will reduce the spread area, reduce the contact time, accelerate the droplet retraction and rebound, and the moving droplet will eventually slide off the wall. The spread area of the wall surface with small contact angle increases and the contact time increases. The droplet finally spreads completely and stays on the wall surface. These results have certain guidance and reference significance for exploring the principle and characteristics of droplet icing on cable wall under different hydrophobicity.

Key words: droplet collision, numerical simulation, anti-icing, multiphase flow

CLC Number:

O359

Jiru HUAI, Peng WANG, Mengyu YANG. Simulation of Droplet Impact on Cable Surfaces with Different Contact Angles[J]. Chinese Journal of Computational Physics, 2024, 41(3): 298-307.

Figures/Tables 12

Fig.1 Phase volume fraction (a) numerical representation; (b) interface representation

Fig.2 Calculation area

Fig.3 Calculate area meshing

Table 1 The number of nodes and cells under different mesh sizes

加密区域网格尺寸/mm	总网格数/10⁴	结果偏差/%
0.5	6.3	5.56
0.2	7.8	4.73
0.1	16.8	4.02
0.05	75.0	3.46
0.02	928.5	3.24

Table 2 Physical properties and thermal properties of XLPE

密度/(kg·m^-3)	泊松比	弹性模量/(MPa)	比热容/(J·(kg·K)^-1)	热传导/(W·(m·K)^-1)	热膨胀系数/(℃^-1)
9.55 × 10²	0.47	800	2 300	0.47	1.5 × 10^-4

Table 3 Physical properties of liquid water and air

材料	密度/(kg·m^-3)	表面张力/(N·m^-1)	粘度/(kg·(m·s)^-1)	比热容/(J·(kg·K)^-1)	热导率/(W·(m·K)^-1)
液态水	9.982 × 10²	0.071 940 4	0.001 003	4 182	0.6
空气	1.225		1.789 4 × 10^-5	1 006.43	0.024 2

Fig.4 Relative positions of cables and water droplets

Fig.5 Results of calculation Exp.[26-28]

Fig.6 Morphological change process

Fig.7 Spreading radius of droplets

Fig.8 Pressure cloud diagram (a) contact angle 35°; (b) contact angle 115°; (c) contact angle 165°

Fig.9 Velocity vector diagram (a) contact angle 35°; (b) contact angle 115°; (c) contact angle 165°

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