Splashing model for impact of supercooled large droplets on a thin liquid film

Ellen Norde; Jacco Hospers; Edwin Theodorus Antonius van der Weide; Hendrik Willem Marie Hoeijmakers

doi:10.2514/6.2014-0738

Splashing model for impact of supercooled large droplets on a thin liquid film

Ellen Norde, Jacco Hospers, Edwin Theodorus Antonius van der Weide, Hendrik Willem Marie Hoeijmakers

Faculty of Engineering Technology

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

Abstract

Compared to conventional icing additional droplet phenomena have to be accounted for in icing caused by supercooled large droplets (SLD) such as splashing, rebound, breakup and deformation. In this study the effect of the presence of a thin liquid film of water on the surface has been investigated. This liquid layer can arise when SLD droplets freeze only partially following impact on the airfoil. The effect of the liquid film is simulated by using the wall shear stress and by assuming a linear velocity profile in the liquid layer. The shear stress is calculated by coupling an integral boundary-layer method to a potential ow method. An improved splashing model has been implemented in the existing com-putational method. This splashing model consists of a deposition model that accounts for splashing during impact of droplets on a liquid layer. In an extension to this model different solidification models have been investigated to estimate the time of solidification of a liquid splat produced on the surface after impact. One is a planar solidification model which is described by the Stefan problem for heat conduction and which is mostly controlled by diffusion. The second model is based on dendritic solidification, which is rapid and gov-erned by kinetics. The results of the deposition model on SLD ice accretion are compared with data from experiments on a NACA-23012 airfoil and on a NACA-0012 airfoil. Good agreement is found.

Original language	English
Title of host publication	Proceedings 52nd Aerospace Sciences Meeting held at 2014 AIAA Science and Technology Forum and Exhibition (SciTech 2014)
Place of Publication	Reston, VA
Publisher	American Institute of Aeronautics and Astronautics Inc. (AIAA)
Pages	7062-7076
ISBN (Electronic)	978-1-62410-256-1
ISBN (Print)	978-1-63266-928-5
DOIs	https://doi.org/10.2514/6.2014-0738
Publication status	Published - 13 Jan 2014
Event	52nd AIAA Aerospace Sciences Meeting 2014 - National Harbor, United States Duration: 13 Jan 2014 → 17 Jan 2014 Conference number: 52

Conference

Conference	52nd AIAA Aerospace Sciences Meeting 2014
Country/Territory	United States
City	National Harbor
Period	13/01/14 → 17/01/14
Other	held during the 2014 AIAA SciTech Forum

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10.2514/6.2014-0738

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Norde, E., Hospers, J., van der Weide, E. T. A., & Hoeijmakers, H. W. M. (2014). Splashing model for impact of supercooled large droplets on a thin liquid film. In Proceedings 52nd Aerospace Sciences Meeting held at 2014 AIAA Science and Technology Forum and Exhibition (SciTech 2014) (pp. 7062-7076). American Institute of Aeronautics and Astronautics Inc. (AIAA). https://doi.org/10.2514/6.2014-0738

Norde, Ellen ; Hospers, Jacco ; van der Weide, Edwin Theodorus Antonius ; Hoeijmakers, Hendrik Willem Marie. / Splashing model for impact of supercooled large droplets on a thin liquid film. Proceedings 52nd Aerospace Sciences Meeting held at 2014 AIAA Science and Technology Forum and Exhibition (SciTech 2014). Reston, VA : American Institute of Aeronautics and Astronautics Inc. (AIAA), 2014. pp. 7062-7076

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title = "Splashing model for impact of supercooled large droplets on a thin liquid film",

abstract = "Compared to conventional icing additional droplet phenomena have to be accounted for in icing caused by supercooled large droplets (SLD) such as splashing, rebound, breakup and deformation. In this study the effect of the presence of a thin liquid film of water on the surface has been investigated. This liquid layer can arise when SLD droplets freeze only partially following impact on the airfoil. The effect of the liquid film is simulated by using the wall shear stress and by assuming a linear velocity profile in the liquid layer. The shear stress is calculated by coupling an integral boundary-layer method to a potential ow method. An improved splashing model has been implemented in the existing com-putational method. This splashing model consists of a deposition model that accounts for splashing during impact of droplets on a liquid layer. In an extension to this model different solidification models have been investigated to estimate the time of solidification of a liquid splat produced on the surface after impact. One is a planar solidification model which is described by the Stefan problem for heat conduction and which is mostly controlled by diffusion. The second model is based on dendritic solidification, which is rapid and gov-erned by kinetics. The results of the deposition model on SLD ice accretion are compared with data from experiments on a NACA-23012 airfoil and on a NACA-0012 airfoil. Good agreement is found.",

author = "Ellen Norde and Jacco Hospers and {van der Weide}, {Edwin Theodorus Antonius} and Hoeijmakers, {Hendrik Willem Marie}",

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Norde, E, Hospers, J, van der Weide, ETA & Hoeijmakers, HWM 2014, Splashing model for impact of supercooled large droplets on a thin liquid film. in Proceedings 52nd Aerospace Sciences Meeting held at 2014 AIAA Science and Technology Forum and Exhibition (SciTech 2014). American Institute of Aeronautics and Astronautics Inc. (AIAA), Reston, VA, pp. 7062-7076, 52nd AIAA Aerospace Sciences Meeting 2014, National Harbor, Maryland, United States, 13/01/14. https://doi.org/10.2514/6.2014-0738

Splashing model for impact of supercooled large droplets on a thin liquid film. / Norde, Ellen; Hospers, Jacco; van der Weide, Edwin Theodorus Antonius ; Hoeijmakers, Hendrik Willem Marie.

Proceedings 52nd Aerospace Sciences Meeting held at 2014 AIAA Science and Technology Forum and Exhibition (SciTech 2014). Reston, VA : American Institute of Aeronautics and Astronautics Inc. (AIAA), 2014. p. 7062-7076.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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N2 - Compared to conventional icing additional droplet phenomena have to be accounted for in icing caused by supercooled large droplets (SLD) such as splashing, rebound, breakup and deformation. In this study the effect of the presence of a thin liquid film of water on the surface has been investigated. This liquid layer can arise when SLD droplets freeze only partially following impact on the airfoil. The effect of the liquid film is simulated by using the wall shear stress and by assuming a linear velocity profile in the liquid layer. The shear stress is calculated by coupling an integral boundary-layer method to a potential ow method. An improved splashing model has been implemented in the existing com-putational method. This splashing model consists of a deposition model that accounts for splashing during impact of droplets on a liquid layer. In an extension to this model different solidification models have been investigated to estimate the time of solidification of a liquid splat produced on the surface after impact. One is a planar solidification model which is described by the Stefan problem for heat conduction and which is mostly controlled by diffusion. The second model is based on dendritic solidification, which is rapid and gov-erned by kinetics. The results of the deposition model on SLD ice accretion are compared with data from experiments on a NACA-23012 airfoil and on a NACA-0012 airfoil. Good agreement is found.

AB - Compared to conventional icing additional droplet phenomena have to be accounted for in icing caused by supercooled large droplets (SLD) such as splashing, rebound, breakup and deformation. In this study the effect of the presence of a thin liquid film of water on the surface has been investigated. This liquid layer can arise when SLD droplets freeze only partially following impact on the airfoil. The effect of the liquid film is simulated by using the wall shear stress and by assuming a linear velocity profile in the liquid layer. The shear stress is calculated by coupling an integral boundary-layer method to a potential ow method. An improved splashing model has been implemented in the existing com-putational method. This splashing model consists of a deposition model that accounts for splashing during impact of droplets on a liquid layer. In an extension to this model different solidification models have been investigated to estimate the time of solidification of a liquid splat produced on the surface after impact. One is a planar solidification model which is described by the Stefan problem for heat conduction and which is mostly controlled by diffusion. The second model is based on dendritic solidification, which is rapid and gov-erned by kinetics. The results of the deposition model on SLD ice accretion are compared with data from experiments on a NACA-23012 airfoil and on a NACA-0012 airfoil. Good agreement is found.

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Norde E, Hospers J, van der Weide ETA , Hoeijmakers HWM. Splashing model for impact of supercooled large droplets on a thin liquid film. In Proceedings 52nd Aerospace Sciences Meeting held at 2014 AIAA Science and Technology Forum and Exhibition (SciTech 2014). Reston, VA: American Institute of Aeronautics and Astronautics Inc. (AIAA). 2014. p. 7062-7076 https://doi.org/10.2514/6.2014-0738

Splashing model for impact of supercooled large droplets on a thin liquid film

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