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Spreading dynamics of droplet on an inclined surface

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Abstract

A three-dimensional unsteady theoretical model of droplet spreading process on an inclined surface is developed and numerically analyzed to investigate the droplet spreading dynamics via the lattice Boltzmann simulation. The contact line motion and morphology evolution for the droplet spreading on an inclined surface, which are, respectively, represented by the advancing/receding spreading factor and droplet wetted length, are evaluated and analyzed. The effects of surface wettability and inclination on the droplet spreading behaviors are examined. The results indicate that, dominated by gravity and capillarity, the droplet experiences a complex asymmetric deformation and sliding motion after the droplet comes into contact with the inclined surfaces. The droplet firstly deforms near the solid surface and mainly exhibits a radial expansion flow in the start-up stage. An evident sliding-down motion along the inclination is observed in the middle stage. And the surface-tension-driven retraction occurs during the retract stage. Increases in inclination angle and equilibrium contact angle lead to a faster droplet motion and a smaller wetted area. In addition, increases in equilibrium contact angle lead to a shorter duration time of the middle stage and an earlier entry into the retract stage.

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Authors and Affiliations

  1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, Jiangsu, People’s Republic of China

    Chaoqun Shen, Cheng Yu & Yongping Chen

  2. School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou, 225127, Jiangsu, People’s Republic of China

    Yongping Chen

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  1. Chaoqun Shen
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  2. Cheng Yu
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  3. Yongping Chen
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Correspondence to Yongping Chen.

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Communicated by S. Balachandar.

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Shen, C., Yu, C. & Chen, Y. Spreading dynamics of droplet on an inclined surface. Theor. Comput. Fluid Dyn. 30, 237–252 (2016). https://doi.org/10.1007/s00162-015-0377-2

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  • DOI: https://doi.org/10.1007/s00162-015-0377-2

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