Heat transfer during multiple droplet impingement and spray cooling: Review and prospects for enhanced surfaces

Benther, Jorge Duarte; Restrepo, Juan Diego Pelaez; Stanley, Cameron; Rosengarten, Gary

doi:10.1016/j.ijheatmasstransfer.2021.121587

Cited by 107 publications

(22 citation statements)

References 199 publications

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“…Manipulating droplet impact behavior on a solid surface is crucial for practical applications , such as spray cooling, inkjet printing, electricity generation, , deicing, etc. Superhydrophobic asymmetric microstructures widely exist in nature.…”

Section: Introductionmentioning

confidence: 99%

Dynamics Behavior of Droplet Impact on a Controllable Curved Micropillar Array Surface Induced by a Magnetic Field

et al. 2023

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Many fields would greatly benefit from the realization of the manipulation of droplet impact behavior by an asymmetric surface structure, such as self-cleaning, anti-icing, inkjet printing, etc. However, research on the prediction of the impact of the dynamics of small-volume droplets on the asymmetric superhydrophobic surface has been insufficient. In this study, a superhydrophobic curved micropillar array surface with controllable bending angles induced by a magnetic field was prepared. The impact and rebound behaviors of the nanoliter droplets with diameters of 100–300 μm were investigated. The experimental results showed the positive correlation between the threshold Weber number of the impact morphology transition of the droplet and the inclination angle of the micropillar. In addition, the restitution coefficient, which measures the degree of energy loss during the impact process, showed a nonmonotonic dependence on the Weber number. A critical velocity model of the impact morphology transition of the droplet on the curved micropillar array surface and a prediction model of the restitution coefficient of the droplet in different impact morphologies are suggested. Our findings will help in the design of a functional surface for manipulating the impact behavior of the droplet.

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Section: Introductionmentioning

confidence: 99%

Dynamics Behavior of Droplet Impact on a Controllable Curved Micropillar Array Surface Induced by a Magnetic Field

et al. 2023

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“…The dynamic of liquid droplets impacting solid surfaces is a very popular research field thanks to a broad range of engineering applications, such as inkjet printing (Cao et al, 2020;Wijshoff, 2018;, petroleum industries (Luo, Gong, He, Zhang, & He, 2021;Raya, Saaid, Ahmed, & Umar, 2020;Verma, Alrefaee, Quraishi, Ebenso, & Hussain, 2021), and spray cooling (Benther, Pelaez-Restrepo, Stanley, & Rosengarten, 2021;H. Liu, Cai, Yan, Jia, & Yin, 2018;Ruan et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Simulation of droplet impact dynamics on V-shaped walls

Chen

2023

Preprint

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This paper presents the morphological evolution characteristics of a droplet impacting a V-shaped wall by using the lattice Boltzmann method (LBM). Four parameters are investigated comprehensively. The parameters vary over wide ranges: surface wettability (60o ≤ θeq ≤ 120o), Weber number (102.27 ≤ We ≤ 3681.82), bending angle of the V-shaped wall (90o ≤ θ ≤ 180o), and eccentricity ratio (0 ≤ b ≤ 0.5). Two types of collision are observed: deposition and breakage. For breakage, the number of satellite droplets increases against the increment of We. The splashing occurs for a high We. And the lamella ejection is observed on the hydrophilic wall and the neutral wall. The lamella ejection will be slight against the increase of θeq, while it will become obvious against the increment of θ. In addition, the nondimensional spreading length, width, and height are measured and analyzed. A regime map is established based on We and θ.

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“…，それらをまとめたレビュー論文がいくつか報告されている [15][16][17][18][19][20] ．また，静止固体への複数液滴の衝突に関してもレビュー論文として近年まとめられている 21) ．しかしながら，高温鋼材の移動と液滴衝突の相互作用に関しての研究が少なく [22][23][24] ，スプレー冷却の冷却特性の予測にその知見をそのまま利用可能か疑問である．そこで，著者らは移動する高温固体に液滴列が垂直および傾斜衝突する際の流動特性を可視化により研究した 25 (Online version in color.)…”

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Flow Visualization and Heat Transfer Characteristics of Droplet Train Obliquely Impinging on a Moving Hot Solid

2023

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The spray cooling of moving hot solids is widely performed in the steel industry. Understanding flow and heat transfer when droplets impinge on moving hot solids is important. By simultaneous visualization with flash photography and temperature measurement using thermography, the flow and heat transfer of a droplet train obliquely impinging on a moving solid at high temperatures was experimentally investigated. A rectangular test piece (SUS303) was heated to 500 °C at a moving velocity of 0.25-1.5 m/s. The test liquid was water at approximately 25 °C. The pre-impact droplet diameter, impact velocity, and inter-spacing between two successive droplets were 0.69 mm, 2.2 m/s, and 2.23 mm, respectively. The tilt and torsional angles were 50° and -30-60°, respectively. No coalescence of droplets was observed; the droplets deformed independently on the moving solid, even though the torsional angle generated a velocity component along the width of the solid. The surface temperature of solid after droplet impingements depended on the experimental conditions. Wavy temperature profile was obtained when the moving distance of solid was large during two successive collisions. The temperature changed continuously for the small distances. In this regard, a simple model considering droplet movement, collisional deformation behavior, and solid migration can explain this phenomenon by the overlap of the cooling regions of the droplets. Furthermore, experimental and numerical analyses show that the heat removal rate of individual droplets is constant at approximately 12.5 MW/m 2 and depends on the total contact time when multiple droplets collide.

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Heat transfer during multiple droplet impingement and spray cooling: Review and prospects for enhanced surfaces

Cited by 107 publications

References 199 publications

Dynamics Behavior of Droplet Impact on a Controllable Curved Micropillar Array Surface Induced by a Magnetic Field

Dynamics Behavior of Droplet Impact on a Controllable Curved Micropillar Array Surface Induced by a Magnetic Field

Simulation of droplet impact dynamics on V-shaped walls

Flow Visualization and Heat Transfer Characteristics of Droplet Train Obliquely Impinging on a Moving Hot Solid

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