Study on the mechanism of sessile droplets evaporation enhanced by the electric field

Wang, Weifeng; Huang, Xin; Wang, Liangxu; Teng, Lin; Luo, Xiaoming; Li, Weidong; Li, Jiaqing; Yin, Pengbo; Luo, Yu; Jiang, Lilong

doi:10.1016/j.ces.2024.119768

Chemical Engineering Science

2024

DOI: 10.1016/j.ces.2024.119768

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Study on the mechanism of sessile droplets evaporation enhanced by the electric field

Weifeng Wang,

Xin Huang,

Liangxu Wang

et al.

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Cited by 3 publications

References 58 publications

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Enhanced evaporation and heat transfer of sessile droplets via coupling electric field and temperature field

Chen,

Gan

2024

Chemical Engineering Journal

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Enhanced evaporation and heat transfer of sessile droplets via coupling electric field and temperature field

Chen,

Gan

2024

Chemical Engineering Journal

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Influence of liquid–vapor phase change on the self-propelled motion of droplets on wettability gradient surfaces

Cunha,

Dorao,

Fernandino

2024

Physics of Fluids

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Self-propelled motion of sessile droplets on gradient surfaces is key to the advancement of microfluidic, nanofluidic, and surface fluidic technologies. Precise control over droplet dynamics, which often involves liquid–vapor phase transitions, is crucial for a variety of applications, including thermal management, self-cleaning surfaces, biochemical assays, and microreactors. Understanding how specific phase changes like condensation and evaporation affect droplet motion is essential for enhancing droplet manipulation and improving transport efficiency. We use the thermal Navier–Stokes–Korteweg equations to investigate the effects of condensation and evaporation on the motion and internal dynamics of droplets migrating across a surface with a linear surface energy profile. The study focuses on the early dynamics of self-propelled motion of a phase changing droplet at sub-micron scale before viscous forces are comparable with the gradient forces. Our results demonstrate that phase change significantly affects the self-propelled motion of droplets by reshaping interfacial mass flux distributions and internal flow dynamics. Condensation increases droplet volume and promotes extensive spreading toward regions of higher wettability, while evaporation reduces both volume and spreading. These changes in droplet shape and size directly affect the driving forces of motion, augmenting self-propulsion through condensation and suppressing it during evaporation. Additionally, each phase change type generates distinct internal flow patterns within the droplet, with condensation and evaporation exhibiting unique circulatory movements driven by localized phase changes near the contact lines.

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Sessile droplet evaporation in the uniform electric field: A lattice Boltzmann method study

Ouyang,

Wang,

Wang

et al. 2025

Physics of Fluids

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Droplet evaporation plays a critical role in nature, science, and industrial applications. The electric field is usually regarded as an effective method to enhance heat and mass transfer. In this work, the evaporation of sessile droplets in the uniform electric field has been numerically studied coupling the mass, momentum, energy, and Poisson equations solved by a lattice Boltzmann method. The results indicate that the heat transfer is affected by the electric field, wettability, and liquid physical properties. The deformation direction of the droplet in the electric field depends on the liquid physical properties, where the prolate deformation occurs with Rσ>Sε and the oblate deformation occurs with Rσ<Sε. When the contact angle is 90°, for a prolate droplet, the evaporation is first enhanced and then hindered in the presence of an electric field, while for an oblate droplet, the evaporation is constantly improved. When the droplet is placed on the hydrophilic (θ0=40°) surface or hydrophobic (θ0=140°) surface, the influence of the electric field gets complicated. The synergistic effect of the electric field and wettability on droplet evaporation strongly depends on the completion of heat convection between the gas and liquid, and heat conduction between the liquid and substrate.

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Study on the mechanism of sessile droplets evaporation enhanced by the electric field

Cited by 3 publications

References 58 publications

Enhanced evaporation and heat transfer of sessile droplets via coupling electric field and temperature field

Enhanced evaporation and heat transfer of sessile droplets via coupling electric field and temperature field

Influence of liquid–vapor phase change on the self-propelled motion of droplets on wettability gradient surfaces

Sessile droplet evaporation in the uniform electric field: A lattice Boltzmann method study

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