Numerical investigation of local heat transfer characteristics of an oblique droplet impacting a wetted wall

Yang, Qi; Wang, X.H.; Zhu, Lei; Wang, R.J.; Zhao, Jin

doi:10.1016/j.csite.2019.100461

Cited by 12 publications

(4 citation statements)

References 20 publications

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“…Yet, on the rim of the crown on both sides exists a larger pressure. The phenomenon agrees with the simulation results in the reference [34] well. The relationship between the left crown height (LCH), right crown height (RCH) and time at different angles are given in Figure 7.…”

Section: Effect Of Droplet Impact Anglesupporting

confidence: 91%

Numerical Simulation of Single Droplet Impingement upon Dynamic Liquid Film Obliquely

et al. 2022

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To better understand the application of droplet impingement in industry and agriculture, in this paper, the coupled level set and volume of fluid (CLSVOF) method is applied to study droplet oblique impact on a dynamic liquid film. The conclusions are the following: the downstream crown height increases and then decreases as the impact angle increases, whereas upstream crown height and spreading length decrease significantly; moreover, the spreading length and upstream crown height increase with the increase of film velocity, while the downstream crown height decreases instead. The increase of gas density inhibits both upstream and downstream crowns. When the fluid viscosity decreases or the impact velocity increases, the crown height increases significantly, which easily leads to crown rupture or droplet splash. The increase in impact velocity leads to an increase in spreading length; however, viscosity has almost no effect on the spreading length.

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Section: Effect Of Droplet Impact Anglesupporting

confidence: 91%

Numerical Simulation of Single Droplet Impingement upon Dynamic Liquid Film Obliquely

et al. 2022

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“…The characterization of mass transfer during multi-droplet impingement in general, and spray etching in particular, requires the accurate tracking of the inherent flow conditions. Numerical modelling of single and multiple droplet impingement is frequently based on the Volume of Fluid (VOF) method [1,[16][17][18][19][20][21][22][23]. Further methods are the Level Set (LS) method [24], combinations of the Level Set and the VOF method (CLSVOF) [25] as well as the Lattice Boltzmann (LB) methods [26].…”

Section: Introductionmentioning

confidence: 99%

“…Three-dimensional models entail very high computational costs [22]. Thus, although a simplification, 2D models are frequently used to model droplet impingement onto liquid films in the presence of multiple droplets, inclined impaction or asymmetric film flow [22,23,[25][26][27][28]37]. Yang et al [23] performed comparisons between the results obtained by a 2D model and experiments.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, although a simplification, 2D models are frequently used to model droplet impingement onto liquid films in the presence of multiple droplets, inclined impaction or asymmetric film flow [22,23,[25][26][27][28]37]. Yang et al [23] performed comparisons between the results obtained by a 2D model and experiments. They found that the numerical model agreed well with the experiment considering a case of millimeter-sized droplets impinging to a liquid film on an inclined plate.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis of Convective Mass Transfer during Multi-Droplet Impingement on a Structured Surface in the Presence of an Adhered Liquid Film—An Application to Spray Etching of PCBs

Eßl

Reiss

Raninger

et al. 2023

Fluids

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Multi-droplet impingement is a fundamental aspect inherent to all kinds of technical spray processes which typically aim at enhancing the convective exchange of reagents or heat at the impinged surface. In this paper, the impingement of multiple droplets onto a structured surface is investigated by a comprehensive CFD model, which resolves the dynamics of the individual droplets and the film on a micro-scale level based on the Volume of Fluid (VOF) method. The considered surface topology includes cavities and is typical for protective masks used in the spray etching of Printed Circuit Boards (PCBs). The agitation of the liquid film in terms of the convective mass transfer rates across virtual horizontal evaluation planes is studied and the influence of film height and droplet impaction velocity is elaborated. Passive tracer tracking is employed to investigate the release and re-entrainment of fluid at the surface cavities. Two modes of mass exchange between the cavities and the main flow upon droplet impingement are identified, which are central inflow accompanied by lateral outflow (1) and lateral inflow with outflow at the opposing side (2). A statistical analysis of the allocation of tracer particles shows that high impaction velocities and low film heights correlate with an enhanced decay of tracer particles within the cavities. The susceptibility to re-entrainment is also reduced by high impaction velocities, whereas increased film heights are found to promote re-entrainment.

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Localized droplet heating by hydrophobic pins: Influence of pin area and droplet size on heat transfer

Al‐Sharafi

Yilbaş

Sahin

et al. 2021

Case Studies in Thermal Engineering

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Numerical investigation of local heat transfer characteristics of an oblique droplet impacting a wetted wall

Cited by 12 publications

References 20 publications

Numerical Simulation of Single Droplet Impingement upon Dynamic Liquid Film Obliquely

Numerical Simulation of Single Droplet Impingement upon Dynamic Liquid Film Obliquely

Numerical Analysis of Convective Mass Transfer during Multi-Droplet Impingement on a Structured Surface in the Presence of an Adhered Liquid Film—An Application to Spray Etching of PCBs

Localized droplet heating by hydrophobic pins: Influence of pin area and droplet size on heat transfer

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