Study of wetting and spontaneous motion of droplets on microstructured surfaces with the lattice Boltzmann method

Tang, G.H.; Xia, Hang; Shi, Yu

doi:10.1063/1.4923033

Cited by 19 publications

(7 citation statements)

References 32 publications

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“…Chapman-Enskog analysis may be insufficient for a multiphase LB model because the higher-order derivatives are seemingly not derivable with a second-order expansion. By taking the free-energy 53 multiphase LB method as an example, Wagner [161] has conducted a high-order Ta ylor expansion analysis to identify the high-order terms recovered in the macroscopic equations (see Eq. (49) in the reference).…”

Section: The Surface Tension Treatmentmentioning

confidence: 99%

“…With the development in the past two decades, many multiphase LB models have been proposed. These models mostly fall into one of the following categories: the color-gradient LB method [24][25][26][27][28][29][30], the pseudopotential LB method [31][32][33][34][35][36][37][38][39], the free-energy LB method [40][41][42][43][44], and the phase-field LB method [45][46][47][48][49][50][51][52][53]. In addition, several multiphase LB models were recently developed based on the entropic LB method [54] and the discrete Boltzmann equation [55].…”

Section: Introductionmentioning

confidence: 99%

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Lattice Boltzmann methods for multiphase flow and phase-change heat transfer

Luo

Kang

et al. 2016

Progress in Energy and Combustion Science

805

373

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Over the past few decades, tremendous progress has been made in the development of particle-based discrete simulation methods versus the conventional continuum-based methods. In particular, the lattice Boltzmann (LB) method has evolved from a theoretical novelty to a ubiquitous, versatile and powerful computational methodology for both fundamental research and engineering applications. It is a kinetic-based mesoscopic approach that bridges the microscales and macroscales, which offers distinctive advantages in simulation fidelity and computational efficiency. Applications of the LB method are now found in a wide range of disciplines including physics, chemistry, materials, biomedicine and various branches of engineering. The present work provides a comprehensive review of the LB method for thermofluids and energy applications, focusing on multiphase flows, thermal flows and thermal multiphase flows with phase change. The review first covers the theoretical framework of the LB method, revealing certain inconsistencies and defects as well as common features of multiphase and thermal LB models. Recent developments in improving the thermodynamic and hydrodynamic consistency, reducing spurious currents, enhancing the numerical stability, etc., are highlighted. These efforts have put the LB method on a firmer theoretical foundation with enhanced LB models that can achieve larger liquid-gas density ratio, higher Reynolds number and flexible surface tension. Examples of applications are provided in fuel cells and batteries, droplet collision, boiling heat transfer and evaporation, and energy storage. Finally, further developments and future prospect of the LB method are outlined for thermofluids and energy applications.3

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Section: The Surface Tension Treatmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Lattice Boltzmann methods for multiphase flow and phase-change heat transfer

Luo

Kang

et al. 2016

Progress in Energy and Combustion Science

805

373

View full text Add to dashboard Cite

show abstract

“…Although it is well known that a greater intrinsic surface free energy difference would induce further displacements and higher velocities, given the existence of hysteresis and friction, the overall motion remains to be explained systematically. In the past, droplet motion on asymmetrical microstructures has been predicted by making use of simulations, 33,34 while other works have addressed a limited number of structural and wetting contrasts experimentally. 22,23,26 However, systematic experimental work exploring a wider range of wetting contrasts, i.e., both average solid fraction and contrasting fraction, is necessary to develop a unified understanding of how motion of droplets can be controlled by surface structure.…”

Section: Take Down Policymentioning

confidence: 99%

Droplet motion on contrasting striated surfaces

Zhao

Orejon

Mackenzie-Dover

et al. 2020

Applied Physics Letters

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Liquid droplets move readily under the influence of surface tension gradients on their substrates. Substrates decorated with parallel microgrooves, or striations, presenting the advantage of homogeneous chemical properties yet varying the topological characteristics on either side of a straight-line boundary are considered in this study. The basic type of geometry consists of hydrophobic micro-striations/rails perpendicular to the boundary, with the systematic variation of the width to spacing ratio, thus changing the solid-liquid contact fraction and inducing a well-defined wettability contrast across the boundary. Droplets in the Cassie-Baxter state, straddling the boundary, move along the wettability contrast in order to reduce the overall surface free energy. Results show the importance of average solid fraction and contrasting fraction in a wide range for given geometries across the boundary on droplet motion. A unified criterion for contrasting striated surfaces, which describes the displacement and the velocity of the droplets, is suggested, providing guidelines for droplet manipulation on microstriated/railed surfaces.

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“…Lattice Boltzmann (LB) method, as a mecroscopic model, has become an effective simulation tool in multiphase flow because of simplicity and natural parallelism (Guo et al , 2010; Ma and Chen, 2017; Wang et al , 2019; Sun et al , 2015; Tang et al , 2015). At present, LB models mainly include pseudo-potential model (Shan and Chen, 1993), color model (Kalarakis et al , 2002) and free energy model (Swift et al , 1995).…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of droplet dynamics on chemically heterogeneous surfaces by lattice Boltzmann method

Wang

Chen

2019

HFF

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Purpose This paper aims to investigate spontaneous movement of single droplet on chemically heterogeneous surfaces induced by the net surface tension, using the improved three-dimensional (3D) lattice Boltzmann (LB) method. Design/methodology/approach D3Q19 Shan-Chen LB model is improved in this paper. Segmented particle distribution functions coupled with the P-R equation of state are introduced to maintain the higher accuracy and greater stability. In addition, exact difference method (EDM) is adopted to implement force term to predict the droplet deformation and dynamics. Findings The numerical results demonstrate that spontaneous movement of single droplet (=1.8 µm) along wedge-shaped tracks is driven by net surface tension. Advancing angle decreases instantaneously with time, while receding angle changes slightly first and then decreases rapidly. Wetting length is affected by vertex angle and wetting difference, whereas the final value is only dependent on the stronger wettability. Although the velocity of single droplet on wedge-shaped tracks can be increased by the larger vertex angle, it has a negative influence on the displacement. For the same wetting difference, vertex angle equal to 30º is an optimization strategy in this model. If the simulation length is extended enough, then the smaller vertex angle is beneficial for the droplet movement. In addition, a larger wetting difference is beneficial to spontaneous movement, which can speed up the droplet movement. Originality/value The proposed numerical model of droplet dynamics on chemically heterogeneous surfaces provides fundamental insights for the enhancement of drop-wise condensation heat transfer.

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Study of wetting and spontaneous motion of droplets on microstructured surfaces with the lattice Boltzmann method

Cited by 19 publications

References 32 publications

Lattice Boltzmann methods for multiphase flow and phase-change heat transfer

Lattice Boltzmann methods for multiphase flow and phase-change heat transfer

Droplet motion on contrasting striated surfaces

Numerical simulation of droplet dynamics on chemically heterogeneous surfaces by lattice Boltzmann method

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