Drop “impact” on an airfoil surface

Wu, Zhenlong

doi:10.1016/j.cis.2018.05.005

Cited by 33 publications

(9 citation statements)

References 116 publications

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“…Liquid drop impact on solid surfaces [1] is of interest in situations ranging from inkjet printing [2,3] to aeronautics [4,5]. It is also a complex, multistage, and multiscale process.…”

mentioning

confidence: 99%

Bouncing off the Walls: The Influence of Gas-Kinetic and van der Waals Effects in Drop Impact

et al. 2020

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A model is developed for liquid drop impact on a solid surface that captures the thin film gas flow beneath the drop, even when the film's thickness is below the mean free path in the gas so that gas kinetic effects (GKE) are important. Simulation results agree with experiments, with the impact speed threshold between bouncing and wetting reproduced to within 5%, while a model without GKE overpredicts this value by at least 50%. To isolate GKE, the pressure dependence of the threshold is mapped and provides experimentally verifiable predictions. There are two principal modes of contact leading to wetting and both are associated with a van der Waals driven instability of the film.

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“…Liquid drop impact on solid surfaces [1] is of interest in situations ranging from inkjet printing [2,3] to aeronautics [4,5]. It is also a complex, multistage, and multiscale process.…”

mentioning

confidence: 99%

Bouncing off the Walls: The Influence of Gas-Kinetic and van der Waals Effects in Drop Impact

et al. 2020

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“…Further to this, it is important to acknowledge that when the droplets are flowing at high speeds, they have the tendency to deform, merge or break before reaching the surface. Therefore, even if the droplet diameter is set to be constant in the icing wind tunnel, it can alter subject to the droplets behavior they may experience under different circumstances [30,31].…”

Section: Experimental Datamentioning

confidence: 99%

Comparison Criteria for Ice Accretion On An Aerofoil Surface

Mussa¹,

Wang²,

Lin³

et al. 2021

14th WCCM-ECCOMAS Congress

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Ice accretion on aerofoils has been researched for many years for aircraft, rotorcraft and wind turbine blades using experimental and numerical techniques. While each method has some distinct advantages, it is the combination of the two strategies that is suggested to be the best way to understand and combat the icing challenge. However, both experimental and numerical techniques have certain limitations which can affect the droplet behavior and the resulting ice profiles. Therefore, when comparing numerically predicted ice shape with experimental data for validation purposes, it is important to account for the limitations of both techniques and identify how the two profiles were compared and deemed acceptable even when the two ice shapes appear to have geometrical discrepancies. Although most of the studies highlight the sources of error in their data, almost none of them explain the strategy employed to validate and verify their results. Furthermore, while the anti/de-icing is involved, energy consumption will be one key factor to consider. There should be a criteria to compare ice shapes from the same icing wind tunnel or results from different test facilities which can further help with comparison of numerical and experimental ice shapes. It would aid to set a standard to improve the quality of our research and make progress in the industry. The aim of the present study is to propose criteria that could be used to compare experimental and numerical ice profiles on an aerofoil surface. Therefore, thorough, and meaningful discussion will be conducted in academic world and relevant industries. The main features of the article are outlined as follows. A brief review on some of the experimental and numerical studies on ice accretion have been presented to discuss the methods used, highlight the technological advancements, and discuss key results and sources of error. Research shows that, in addition to the geometrical comparison, the performance of iced aerofoil must also be considered as a comparison strategy. Based on this analysis, the aim of comparing the ice shapes will be discussed. Following this, numerical results from current study are compared with experimental results to illustrate the necessity and importance of having the criteria. Next section will be devoted to proposing the preliminary criteria. Finally, the conclusion will be provided.

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“…Interface or free surface computation plays an important role in both academic research and industrial applications, such as a liquid drop impacting a solid or liquid surface, 1 a bubble rising in a fluid, wave propagation on the sea surface, cavitation forming around a ship propeller, liquid fuel combustion, etc. Tracking of the interface between two or more fluids has been a challenging task in multiphase flow modeling and simulation.…”

Section: Introductionmentioning

confidence: 99%

Coupling level-set with volume-of-fluid for interface computation of incompressible gas-liquid flows

Tan

Zhang

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this study, a solver coupling the level-set and volume-of-fluid methods is developed for interface computation of incompressible two-phase flows on the OpenFOAM platform. It corrects the surface tension, density, and viscosity of the fluids with the level-set function synchronously. To examine the effect of density and viscosity corrections, an intermediate solver that only corrects the surface tension force is also developed. Two test cases, that is, a bubble rising freely in stagnant water and a drop impacting on a liquid surface, are performed to validate and compare the capabilities of the new solvers. It is found that the coupling solver which corrects all the fluids’ properties mentioned above has the best prediction accuracy, especially for Rayleigh jet issues. With the application of this solver, the mechanism for the bubble entrainment in drop impact on a liquid pool is explained.

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Drop “impact” on an airfoil surface

Cited by 33 publications

References 116 publications

Bouncing off the Walls: The Influence of Gas-Kinetic and van der Waals Effects in Drop Impact

Bouncing off the Walls: The Influence of Gas-Kinetic and van der Waals Effects in Drop Impact

Comparison Criteria for Ice Accretion On An Aerofoil Surface

Coupling level-set with volume-of-fluid for interface computation of incompressible gas-liquid flows

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