Spongy Icing Revisited: Measurements of Ice Accretion Liquid Fraction in Two Icing Tunnels

Lozowski, Edward P.; Oleskiw, Myron; Blackmore, R.Z.; Karev, Anatolij R.; Kollár, László; Farzaneh, M.

doi:10.2514/6.2005-658

Cited by 7 publications

(8 citation statements)

References 6 publications

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“…20 The spongy icing phenomenon is also wellknown to the in-flight icing community. 37,38 In the experiments of icing wind tunnel using a NACA 0012 airfoil, a considerable variation in sponginess ͑or liquid fraction͒ with air temperature, wind speed, and liquid water content was observed. 38 The model herein cannot explain these experimental results.…”

Section: Summary and Discussionmentioning

confidence: 98%

“…37,38 In the experiments of icing wind tunnel using a NACA 0012 airfoil, a considerable variation in sponginess ͑or liquid fraction͒ with air temperature, wind speed, and liquid water content was observed. 38 The model herein cannot explain these experimental results. Therefore, it needs to modify an air-water-ice multiphase system in Fig.…”

Section: Summary and Discussionmentioning

confidence: 98%

“…In order to gain a clear understanding of these viewpoints, it is necessary to add equations governing local liquid fraction and the internal evolution of the spongy layer to the model herein and the effects of the shear stress at a disturbed spongy ice-water interface on the distribution of liquid fraction, permeability, and penetration depth should be investigated along with a study on nonequilibrium coexistence of crystal and shearing liquid flow. 45 Furthermore, the dependence of the liquid fraction on the icing parameter such as air temperature, wind speed, and liquid water content in the experiments by Lozowski et al 38 must be explained. Second, in the linear stability analysis, the amplitude of the ice-water interface disturbance of the most unstable mode increases with time: ␦ b ͑t ‫ء‬ ͒ = exp͑ ‫ء‬ max ͑r͒ t ‫ء‬ ͒␦ b , which affects the magnitude of h x Ј/ h x in Eq.…”

Section: Summary and Discussionmentioning

confidence: 99%

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Linear stability analysis of ice growth under supercooled water film driven by a laminar airflow

Ueno

Farzaneh

2011

Physics of Fluids

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We propose a theoretical model for ice growth under a wind-driven supercooled water film. The thickness and surface velocity of the water layer are variable by changing the air stream velocity. For a given water supply rate, linear stability analysis is carried out to study the morphological instability of the ice-water interface. In this model, water and air boundary layers are simultaneously disturbed due to the change in ice shape, and the effect of the interaction between air and water flows on the growth condition of the ice-water interface disturbance is taken into account. It is shown that as the wind speed increases, the amplification rate of the disturbance is significantly affected by variable stresses exerted on the water-air interface by the air flow as well as restoring forces due to gravity and surface tension. We predict that an ice pattern of a centimeter-scale in wavelength appears and the wavelength decreases as the wind speed increases, and that the ice pattern moves in the direction opposite to the water flow. The effect of the air stress disturbance on the heat transfer coefficient at the water-air interface is also investigated for various wind speeds.

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Section: Summary and Discussionmentioning

confidence: 98%

Section: Summary and Discussionmentioning

confidence: 98%

Section: Summary and Discussionmentioning

confidence: 99%

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Linear stability analysis of ice growth under supercooled water film driven by a laminar airflow

Ueno

Farzaneh

2011

Physics of Fluids

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“…In Ref. 9 it is found that in windtunnel the measured ice fraction is different from the prediction. In that paper the wind stress is thought to be the factor that influences the icing process.…”

Section: B Ice Fraction On the Leading Edgementioning

confidence: 80%

“…They discussed the application of their model in aircraft icing prediction; however the results in the studies were all about the icing flux and sponginess 8 . Although an ice wind tunnel experiment was carried on, the measured ice shape results were not presented in the paper 9 .…”

Section: Introductionmentioning

confidence: 94%

An Ice Accretion Model for Aircraft Icing Based on Supercooled Icing: Theory and Application

Kong

2012

50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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An icing model considering supercooled icing for aircraft icing problem is investigated. Most icing models are based on the method of Messinger, in which the ice and liquid water are distinguished by the temperature of fusion, 273.15 K, and the heat balance equation of supercooled water film is solved to determine the ice accretion. It has been confirmed in experiments that the temperature of ice surface is below the freezing temperature of water. An icing model considering supercooled ice surface is investigated and is compared with the traditional icing model on both ice growth rate and 2D ice shape prediction. In addition, the surface temperature of icing cylinder is computed to verify this model. The results show that this supercooled icing model, compared with traditional model, predicts about twice the growth rate of the traditional model. The ice shape results of supercooled icing model fit well with the experiment results in the temperature range from -4.4 to -28.3℃, while the traditional model cannot work well below -10℃. Nomenclature LWC = liquid water content (g/m 3 ) MVD = median volume diameter (μm) β = droplet collection c = chord(m) Fr = volume fraction of ice

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Numerical Modelling of Icing on Power Network Equipment

Makkonen

Lozowski²

Atmospheric Icing of Power Networks

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Spongy Icing Revisited: Measurements of Ice Accretion Liquid Fraction in Two Icing Tunnels

Cited by 7 publications

References 6 publications

Linear stability analysis of ice growth under supercooled water film driven by a laminar airflow

Linear stability analysis of ice growth under supercooled water film driven by a laminar airflow

An Ice Accretion Model for Aircraft Icing Based on Supercooled Icing: Theory and Application

Numerical Modelling of Icing on Power Network Equipment

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