Experimental investigation of nanoparticles distribution mechanisms and deposition patterns during nanofluid droplet evaporation

Liu, Bin; Wang, ShengWei; Chai, Linjiang; Achkar, Georges El; Chen, Aiqiang; Theodorakis, Panagiotis E.

doi:10.1051/epjap/2020200168

Cited by 6 publications

(6 citation statements)

References 32 publications

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“…175 The overall coupling protocol allows for the exchange of particles at the interface without the need to simulate gas molecules far from the liquid–gas interface and can be used with any force-field, be it all-atom or CG, thus allowing the simulation of a broad range of complex liquids, for example, nanofluids. 183…”

Section: Coupling Molecular To Continuummentioning

confidence: 99%

Multiscale simulation of fluids: coupling molecular and continuum

Smith,

Theodorakis

2024

Phys. Chem. Chem. Phys.

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Section: Coupling Molecular To Continuummentioning

confidence: 99%

Multiscale simulation of fluids: coupling molecular and continuum

Smith,

Theodorakis

2024

Phys. Chem. Chem. Phys.

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“…For example, molecular-level studies have focused on evaporating droplets with nanoparticles. In this case, as the liquid evaporates, various patterns form, which, in turn, can be compared with experimental observations [ 11 , 12 , 18 , 24 ]. Despite these studies, a more accurate description of nucleation and evaporation phenomena requires the development of new simulation frameworks, even for simple systems, for example, single-component systems without the presence of external fields.…”

Section: Introductionmentioning

confidence: 99%

Off-Lattice Monte-Carlo Approach for Studying Nucleation and Evaporation Phenomena at the Molecular Scale

et al. 2021

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Droplet nucleation and evaporation are ubiquitous in nature and many technological applications, such as phase-change cooling and boiling heat transfer. So far, the description of these phenomena at the molecular scale has posed challenges for modelling with most of the models being implemented on a lattice. Here, we propose an off-lattice Monte-Carlo approach combined with a grid that can be used for the investigation of droplet formation and evaporation. We provide the details of the model, its implementation as Python code, and results illustrating its dependence on various parameters. The method can be easily extended for any force-field (e.g., coarse-grained, all-atom models, and external fields, such as gravity and electric field). Thus, we anticipate that the proposed model will offer opportunities for a wide range of studies in various research areas involving droplet formation and evaporation and will also form the basis for further method developments for the molecular modelling of such phenomena.

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“…It is possible to use such competition to regulate the thickness of the micro-needles that form when the polymer film dries in a heated cell near its wall [20]. The effect of the substrate temperature and the initial concentration of nanoparticles on the final sediment shape was previously studied [21]. The geometrical characteristics of drying hydrocarbon droplets and the resulting deposits on a heated aluminum substrate were analyzed in [22].…”

Section: Introductionmentioning

confidence: 99%

Nonuniform heating of a substrate in evaporative lithography

Al-Muzaiqer,

Kolegov,

Ivanova

et al. 2021

Preprint

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The work is devoted to the study of one method connected with structured sediments formation, which belongs to the direction of evaporative lithography. A series of experiments were carried out with nonuniform evaporation of an isopropanol film containing polystyrene microspheres that occurred in an open cylindrical cell. The local inhomogeneity of the vapor flux density was achieved due to the temperature gradient. A copper rod was mounted in the central part of the bottom of the cell for further heating. The thermocapillary flow resulting from the surface tension gradient due to the temperature drop transfers the particles that were originally at rest along the bottom of the cell. The effect of the initial thickness of the liquid layer on the height and area of the sediment (cluster) formed in the central region of the cell is experimentally studied. The velocity of the particles was measured using particle image velocimetry. A mathematical model describing the process at the initial stage is developed. The equations of heat transfer and thermal conductivity were used to define the temperature distribution in the liquid and the cell. The fluid flow was simulated by the lubrication approximation. The particle distribution was modeled using the convection-diffusion equation. The evaporation flux density was calculated using the Hertz-Knudsen equation. The dependence of the liquid viscosity on the particle concentration was described by Mooney's formula. Numerical results showed that the liquid film gradually becomes thinner in the central region, as the surface tension decreases with increasing temperature. The liquid flow is directed to the heater near the substrate. It transfers the particles to the center of the cell. The volume fraction of the particles increases over time in this region. The work done allowed us to formulate the conclusion that the heat flow from the heater affects the geometry of the sediment for two reasons. First, the Marangoni flow velocity depends on the temperature gradient. Secondly, the decrease in film thickness near the heater depends on the temperature.

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Experimental investigation of nanoparticles distribution mechanisms and deposition patterns during nanofluid droplet evaporation

Cited by 6 publications

References 32 publications

Multiscale simulation of fluids: coupling molecular and continuum

Multiscale simulation of fluids: coupling molecular and continuum

Off-Lattice Monte-Carlo Approach for Studying Nucleation and Evaporation Phenomena at the Molecular Scale

Nonuniform heating of a substrate in evaporative lithography

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