Numerical studies of dynamic behavior of liquid film on single-layer wire mesh with different wettabilities

doi:10.1007/s11705-022-2205-8

Front. Chem. Sci. Eng.

2022, Vol. 16

Issue (11) : 1672-1680 https://doi.org/10.1007/s11705-022-2205-8

RESEARCH ARTICLE

Numerical studies of dynamic behavior of liquid film on single-layer wire mesh with different wettabilities

Hai-Long Liao^1,², Lan Jiang^1,², Hai-Xin Yu^1,², Zhi-Hao Liu^1,², Ji-Wen Fu^1,²(

), Guang-Wen Chu^1,², Yong Luo^1,²(

)

¹. State Key Laboratory of Organic–Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
². Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029, China

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Abstract

Droplet impacting on the stainless steel wire mesh is very common in chemical devices, like a rotating packed bed. Surface wettability of wire mesh significantly affects the liquid flow pattern and liquid dispersion performance. However, the effect of surface wettability on the impaction phenomena at microscale such as liquid film is still unknown. In this work, the dynamic behavior of liquid film on the surface of wire mesh was analyzed by computational fluid dynamics simulation. The dynamic behavior of liquid film on the surface of wire mesh can be divided into the following three steps: (1) spreading step; (2) shrinkage process; (3) stabilizing or disappearing step. Effects of surface wettability, as well as operating conditions, on wetting area and liquid film thickness were studied. Compared to the hydrophilic wire mesh, the final wetting area of hydrophobic wire mesh is zero in most cases. The average liquid film thickness on the surface of hydrophilic wire mesh is 30.02–77.29 μm, and that of hydrophobic wire mesh is 41.76–237.37 μm. This work provided a basic understanding of liquid film flow at microscale on the surface with various surface wettabilities, which can be guiding the packing optimization and design.

Keywords stainless steel wire mesh computational fluid dynamics surface wettability liquid film impacting

Corresponding Author(s): Ji-Wen Fu,Yong Luo

Online First Date: 09 November 2022 Issue Date: 13 December 2022

Cite this article:

Hai-Long Liao,Lan Jiang,Hai-Xin Yu, et al. Numerical studies of dynamic behavior of liquid film on single-layer wire mesh with different wettabilities[J]. Front. Chem. Sci. Eng., 2022, 16(11): 1672-1680.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-022-2205-8
https://academic.hep.com.cn/fcse/EN/Y2022/V16/I11/1672

Fig.1 Images of (a) 3D computational domains and (b) local meshes of single-layer woven SSM.

Tab.1 Operating conditions

Fig.2 (a) Dynamic behavior of liquid film on hydrophilic SSM at u₀ = 3.15 m·s^–1, D₀ = 3.50 mm; (b) dynamic behavior of liquid film on hydrophobic SSM at u₀ = 3.15 m·s^–1, D₀ = 3.50 mm.

Fig.3 Velocity vector of liquid film on the SSM surface. (a) α-70°; (b) α-155°.

Fig.4 Effect of surface wettability of SSM on the wetting area at u₀ = 3.15 m·s^–1, D₀ = 3.50 mm.

Fig.5 Effects of (a) α-70° and (b) α-155° on the wetting area at different initial droplet velocities.

Fig.6 Effects of (a) α-70° and (b) α-155° on the wetting area at different mother droplet diameters.

Fig.7 Schematic diagram of liquid film thickness measurement. (a) Selection of cross-section; (b) an example of a liquid film thickness measurement for plane 4.

Fig.8 Effect of surface wettability of SSM on the liquid film thickness at u₀ = 3.15 m·s^–1, D₀ = 3.50 mm.

Fig.9 Effects of (a) α-70° and (b) α-155° on the liquid film thickness at different initial droplet velocities.

Fig.10 Effects of (a) α-70° and (b) α-155° on the liquid film thickness at different mother droplet diameters.

Tab.2 δ_avg at different surface wettabilities of SSM

Tab.3 δ_avg at different initial droplet velocities and mother droplet diameters

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