Deposition Process of Droplets Impacting on a Horizontal Surface

Li, Jing Yin; Han, Qunying; Zhao, Yan; Yuan, Xiao Fang

doi:10.4028/www.scientific.net/amr.354-355.579

Cited by 6 publications

(2 citation statements)

References 9 publications

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“…A particular result depends on the effect, highly on the velocity, size of drop, viscosity, contact angle, surface roughness between surface and drop, and the surface tension [4]. The discrepancy in the shapes of drop for the dry horizontal surface is more obvious [5], as depicted in the figure 1. If a drop of liquid hits an enveloped surface with a tender liquid layer that overtakes the surface coarseness height, either spreading or splashing is going to happen [3].…”

Section: Introductionmentioning

confidence: 97%

Single and Double Drop Impingement on a Heated Plate CFD and Experimental Investigation

Namaa

Rasool

2021

ETJ

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A drop impingement on a hot surface is known as an effective way for heat removal. The present work uses a VOF (volume of fluid) model to simulate the flow behavior and temperature distribution on a 50 °C heated plate while relatively cold water drop is impinging. The temperature distribution at the impingement zone is used to examine the transient heat transfer coefficients using a single drop and double drops conditions. The spreading factor is tested in both cases. A test rig is built to verify the temperature distribution and a heat balance method is introduced to find the experimental heat coefficients on the heated. The CFD solution and its flow results gives a good agreement for single drop previous results. The results for the double drop condition show a high tendency for rebound and splash of the drop leaving the central zone without water drop coverage which way causes a burn out in case of high heat fluxes. The single drop condition show a symmetrical temperature and heat transfer coefficients distribution while the double drop impingement gives lower value of coefficients with non-uniform and unsymmetrical distribution specially at the bigger drop to plate distances. The experimental average heat coefficients gives relatively low error of only 5% in case of double drop when compared to the single drop values.

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Section: Introductionmentioning

confidence: 97%

Single and Double Drop Impingement on a Heated Plate CFD and Experimental Investigation

Namaa

Rasool

2021

ETJ

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“…Based on a review of the literature, Glass et al 23 concluded that CFD models have the potential to provide accurate predictions of pesticide droplet flow on leaf surfaces by taking into account the influences of each of the key parameters (surface topography and chemistry, initial spray deposition conditions, evaporation and multiple droplet spreading interactions). Multiphase computational fluid dynamic (CFD) models based on the Volume Of Fluid (VOF) approach have been used to study the dynamic behavior of droplet surface interactions in different systems, [24][25][26][27][28][29][30] but not yet for droplet-plant interactions. The VOF has the ability to dynamically capture the interface between the gas and the liquid phases and determine the droplet surface impact characteristics by taking into account the properties of the liquid and the surrounding air, droplet impact characteristics and surface morphology.…”

Section: Introductionmentioning

confidence: 99%

Predicting the dynamic impact behaviour of spray droplets on flat plant surfaces

Delele

Nuyttens²,

Duga

et al. 2016

Soft Matter

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The dynamic impact behaviour of water droplets on plant surfaces was investigated based on a multiphase computational fluid dynamics (CFD) model. The study was conducted using the Volume Of Fluid (VOF) approach. The static contact angle of water droplets on leaf surfaces of different plants (apple, pear, leek and cabbage) was measured and found to vary between 54.9 and 138.2°. Impact experiments were conducted by monitoring the flow and impact characteristics of water droplets on leaves in still air with a high speed camera. Droplets were generated by an agricultural flat fan spray nozzle moving across the leaf at constant speed. The nozzle produced droplets with diameters ranging from 20.6 up to 550.8 μm, and droplet velocity values near the impact between 0.03 and 13.2 m s(-1). The CFD model was capable of predicting the observed dynamic impact behaviour of droplets on the plant surfaces. The fate of the droplets after the impact process for adhesion, bouncing or splashing was accurately predicted for Weber numbers (We) in the range of 0.007 to 1096 and droplet Reynolds numbers (Re) between 5 to 8000. The process was highly dependent on the surface and droplet flow characteristics during the impact. Combinations of We, Re and Ohnesorge (Oh) numbers defined the droplet maximum spread factor, the number of secondary droplets generated as a result of the splashing process and the transition between the different impact outcomes. These criteria can then be used in field scale spray deposition and drift models to better understand agricultural spray operations.

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Fumigant toxicity of essential oils against Sitophilus zeamais (Motschulsky) (Coleoptera: Curculionidae): a systematic review and meta-analysis

et al. 2021

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Deposition Process of Droplets Impacting on a Horizontal Surface

Cited by 6 publications

References 9 publications

Single and Double Drop Impingement on a Heated Plate CFD and Experimental Investigation

Single and Double Drop Impingement on a Heated Plate CFD and Experimental Investigation

Predicting the dynamic impact behaviour of spray droplets on flat plant surfaces

Fumigant toxicity of essential oils against Sitophilus zeamais (Motschulsky) (Coleoptera: Curculionidae): a systematic review and meta-analysis

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