Numerical simulation of droplet evaporation on a hot surface near Leidenfrost regime using multiphase lattice Boltzmann method

Karami, Naser; Rahimian, Mohammad Hassan; Farhadzadeh, Mohsen

doi:10.1016/j.amc.2017.05.038

Cited by 13 publications

(2 citation statements)

References 17 publications

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“…This is the reason why numerical simulation of pore ow is a highly relevant and increasingly important approach here. [26][27][28][29] Analysis of drop spreading and penetration for inkjet printing is challenging due to several factors. First, the relevant drop size is in the low picoliter range, with a drop diameter around 24 mm.…”

Section: Introductionmentioning

confidence: 99%

The effect of viscosity and surface tension on inkjet printed picoliter dots

2019

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Section: Introductionmentioning

confidence: 99%

The effect of viscosity and surface tension on inkjet printed picoliter dots

2019

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“…As an alternative, computer simulation can overcome or compensate for these experimental limitations by providing a suitable method for investigating the evaporation phenomenon of droplets and related particle deposition patterns, particularly for very small droplets undergoing rapid evaporation. To date, numerous simulation methods have been developed to describe the evaporation process, including direct numerical simulation [36,37], lattice Boltzmann methods [17,38,39], molecular dynamics [40], and finite element methods [41]. These simulation techniques enabled the characterization of droplet evaporation, which was compared with and validated by the experimental results under various conditions.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of particle deposition patterns in evaporating droplets

Lee¹,

Kim²

2021

J. Micromech. Microeng.

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Nanostructures are used for various chemical, biological, and even volatile organic compound (VOC) sensor applications, in which the inkjet printer provides an easy and convenient fabrication method. In particular, nanoparticles in injected droplets form various self-assembled nanostructures after evaporation such as flat films, rings, and domes, whose patterns are largely influenced by the flow fields within those droplets, temperature, humidity, and substrate wettability. In addition, the temperature at the liquid–gas interface of the droplets governs the local surface tension and evaporation flux, thereby determining the convection fluid flow and particle movement. In this study, we investigate four particle deposition patterns via numerical simulations. First, we reveal the formation of monolayered flat-films on a superhydrophilic substrate in the constant contact angle (CCA) mode during evaporation. Second, we confirm that particles in evaporated droplets usually form coffee-ring patterns on a hydrophilic substrate, which are mainly governed by capillary flows. Interestingly, we find that the coffee rings with low aspect ratios appear to be well-ordered in the constant contact radius mode, while those with high aspect ratios appear to be non-uniformly self-assembled in the CCA mode in an amorphous structure. Third, we prove that the Marangoni flow generated on a hydrophobic substrate accumulates particles at the center of the droplet, forming well-ordered dome-shaped patterns. Furthermore, we experimentally demonstrate four different particle deposition patterns to validate our simulation results and confirm that both sets of results are in reasonable agreement with each other. Hence, we believe that these theoretical model and simulation results can help to develop various nanostructure-based sensor applications by enhancing their performance.

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Numerical study of droplet impact on a superheated surface under an electric field based on perfect and leaky dielectric theories

Ghadami,

Pournaderi

2024

Heat Trans

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This paper investigates the hydrothermal behavior of leaky dielectric and perfect dielectric droplets impacting a superheated wall within a specific range of Weber numbers under an electric field. Through this investigation, we aim to provide a more comprehensive understanding of the dynamics involved in droplet‐superheated surface interactions under electric fields, which can be useful in various applications, such as the design of cooling systems and combustion chambers. The study utilizes the level‐set and ghost fluid techniques to capture the interface accurately. Under an electric field, different behaviors are observed during the impact process, depending on the electrical properties of the droplet. A perfect dielectric droplet experiences a reduction in spreading extent and an increase in contact time. However, no remarkable enhancement in total heat removal occurs in this case. For the leaky dielectric droplet exhibiting prolate deformation at the stationary state, increasing the electric field magnitude results in a slight decrease in the droplet spreading extent, while the droplet contact time and total heat removal from the surface increase. At an electric capillary number of 1.55E − 2 and a Weber number of 25, the enhancement in the contact time and total heat removal is about 43% and 15%, respectively. For the leaky dielectric droplet with oblate deformation at the stationary state, the spreading extent and total heat removal increase, with negligible changes in contact time. At the above‐mentioned electric capillary and Weber numbers, the enhancement in the spreading extent and total heat removal is about 7.5% and 15%, respectively.

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Numerical simulation of droplet evaporation on a hot surface near Leidenfrost regime using multiphase lattice Boltzmann method

Cited by 13 publications

References 17 publications

The effect of viscosity and surface tension on inkjet printed picoliter dots

The effect of viscosity and surface tension on inkjet printed picoliter dots

Numerical simulation of particle deposition patterns in evaporating droplets

Numerical study of droplet impact on a superheated surface under an electric field based on perfect and leaky dielectric theories

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