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A Two-dimensional Splashing Model for Investigating Impingement Characteristics of Supercooled Large Droplets. / Wang, C; Chang, S; Leng, M; Wu, Hongwei; Yang, B.

In: International Journal of Multiphase Flow, Vol. 80, 01.04.2016, p. 131-149.

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@article{486b85d406bf4cbda0c48efb9df1d00c,
title = "A Two-dimensional Splashing Model for Investigating Impingement Characteristics of Supercooled Large Droplets",
abstract = "In this article, a two-dimensional (2D) splashing model is proposed to investigate the dynamics when supercooled large droplets (SLD) impinging on a wall surface in the aircraft-icing field. Energy conservation for droplet motion and impingement is used to capture the properties of the splashed droplets. A new statistical treatment of the droplet impinging energy and angle during the droplet-wall interaction is introduced in order to calculate the average dynamics of the SLD within a micro-control volume on wall surface. Based on the LEWICE predictions of droplet collection efficiencies and the available experimental ones, a new criterion for droplet splashing/deposition as well as a new formulation for the splashed mass is suggested. Lagrangian approach is adopted to describe the movement and impingement of SLD. The proposed model together with the previously developed droplet tracking method (DTM) for calculating droplet collection efficiency with the effect of droplet reimpingement constitute a relatively complete predicting approach of SLD impingement characteristics. Comparisons between the current predictions and the experimental observations, including SLD impingement over clean and contaminated airfoil surfaces as well as shapes of ice accretion in typical icing conditions, are carried out. Further, results obtained with the LEWICE splashing model are also plotted on the same graphs in order to assess the accuracy of the current splashing model in predicting SLD impingement. Results show that good agreement is achieved between the current predictions, including SLD impingement and ice accretion shapes, and the experimental ones. The predictions of the impingement distribution over contaminated surfaces obtained with the current splashing model show a much closer agreement with the experimental results than the ones obtained with LEWICE splashing model. For further investigation of SLD impingement, the properties of the droplet splashing and reimpingement during the ice accretion process are also addressed.",
keywords = "splashing model, SLD, collection efficiency, impingement, ice accretion",
author = "C Wang and S Chang and M Leng and Hongwei Wu and B Yang",
note = "This document is the Accepted Manuscript of the following article: C. Wang, S. Chang, M. Leng, H. Wu, and B. Yang, 'A two-dimensional splashing model for investigating impingement characteristics of supercooled large droplets', International Journal of Multiphase Flow, Vol. 80, April 2016, pp. 131-149. This manuscript version is made available under the terms of the Creative Commons CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The Version of Record is available online at doi: https://doi.org/10.1016/j.ijmultiphaseflow.2015.12.005. {\textcopyright} 2015 Elsevier Ltd. All rights reserved. ",
year = "2016",
month = apr,
day = "1",
doi = "10.1016/j.ijmultiphaseflow.2015.12.005",
language = "English",
volume = "80",
pages = "131--149",
journal = "International Journal of Multiphase Flow",
issn = "0301-9322",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - A Two-dimensional Splashing Model for Investigating Impingement Characteristics of Supercooled Large Droplets

AU - Wang, C

AU - Chang, S

AU - Leng, M

AU - Wu, Hongwei

AU - Yang, B

N1 - This document is the Accepted Manuscript of the following article: C. Wang, S. Chang, M. Leng, H. Wu, and B. Yang, 'A two-dimensional splashing model for investigating impingement characteristics of supercooled large droplets', International Journal of Multiphase Flow, Vol. 80, April 2016, pp. 131-149. This manuscript version is made available under the terms of the Creative Commons CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The Version of Record is available online at doi: https://doi.org/10.1016/j.ijmultiphaseflow.2015.12.005. © 2015 Elsevier Ltd. All rights reserved.

PY - 2016/4/1

Y1 - 2016/4/1

N2 - In this article, a two-dimensional (2D) splashing model is proposed to investigate the dynamics when supercooled large droplets (SLD) impinging on a wall surface in the aircraft-icing field. Energy conservation for droplet motion and impingement is used to capture the properties of the splashed droplets. A new statistical treatment of the droplet impinging energy and angle during the droplet-wall interaction is introduced in order to calculate the average dynamics of the SLD within a micro-control volume on wall surface. Based on the LEWICE predictions of droplet collection efficiencies and the available experimental ones, a new criterion for droplet splashing/deposition as well as a new formulation for the splashed mass is suggested. Lagrangian approach is adopted to describe the movement and impingement of SLD. The proposed model together with the previously developed droplet tracking method (DTM) for calculating droplet collection efficiency with the effect of droplet reimpingement constitute a relatively complete predicting approach of SLD impingement characteristics. Comparisons between the current predictions and the experimental observations, including SLD impingement over clean and contaminated airfoil surfaces as well as shapes of ice accretion in typical icing conditions, are carried out. Further, results obtained with the LEWICE splashing model are also plotted on the same graphs in order to assess the accuracy of the current splashing model in predicting SLD impingement. Results show that good agreement is achieved between the current predictions, including SLD impingement and ice accretion shapes, and the experimental ones. The predictions of the impingement distribution over contaminated surfaces obtained with the current splashing model show a much closer agreement with the experimental results than the ones obtained with LEWICE splashing model. For further investigation of SLD impingement, the properties of the droplet splashing and reimpingement during the ice accretion process are also addressed.

AB - In this article, a two-dimensional (2D) splashing model is proposed to investigate the dynamics when supercooled large droplets (SLD) impinging on a wall surface in the aircraft-icing field. Energy conservation for droplet motion and impingement is used to capture the properties of the splashed droplets. A new statistical treatment of the droplet impinging energy and angle during the droplet-wall interaction is introduced in order to calculate the average dynamics of the SLD within a micro-control volume on wall surface. Based on the LEWICE predictions of droplet collection efficiencies and the available experimental ones, a new criterion for droplet splashing/deposition as well as a new formulation for the splashed mass is suggested. Lagrangian approach is adopted to describe the movement and impingement of SLD. The proposed model together with the previously developed droplet tracking method (DTM) for calculating droplet collection efficiency with the effect of droplet reimpingement constitute a relatively complete predicting approach of SLD impingement characteristics. Comparisons between the current predictions and the experimental observations, including SLD impingement over clean and contaminated airfoil surfaces as well as shapes of ice accretion in typical icing conditions, are carried out. Further, results obtained with the LEWICE splashing model are also plotted on the same graphs in order to assess the accuracy of the current splashing model in predicting SLD impingement. Results show that good agreement is achieved between the current predictions, including SLD impingement and ice accretion shapes, and the experimental ones. The predictions of the impingement distribution over contaminated surfaces obtained with the current splashing model show a much closer agreement with the experimental results than the ones obtained with LEWICE splashing model. For further investigation of SLD impingement, the properties of the droplet splashing and reimpingement during the ice accretion process are also addressed.

KW - splashing model

KW - SLD

KW - collection efficiency

KW - impingement

KW - ice accretion

U2 - 10.1016/j.ijmultiphaseflow.2015.12.005

DO - 10.1016/j.ijmultiphaseflow.2015.12.005

M3 - Article

VL - 80

SP - 131

EP - 149

JO - International Journal of Multiphase Flow

JF - International Journal of Multiphase Flow

SN - 0301-9322

ER -