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25.01.2011_08 - JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER...

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Heat Transfer to a Composite Material Under Ice Particle Impacts Y. K. Hong, C. Park, and S. W. Baek Korea Advanced Institute of Science and Technology, Taejon 305-701, Republic of Korea DOI: 10.2514/1.47776 This paper examines what would happen if a supersonic vehicle ies through an atmosphere laden with ice particles. In previous research of the present authors, an experiment was performed to determine the characteristics of ice-particle impact phenomenon. Therein, the mass loss from the vehicle s surface material by the impacts was measured and the fragments behavior was studied. In the present work, the trajectories of fragments from the stagnation region were calculated at the experimental conditions. It was surmised that the ow in the stagnation region is turbulent. Turbulent ow increases the heat transfer rate to the surface, and consequently the mass loss increases. To determine the extent of heat transfer rate increase, the new turbulence model, tentatively named crater- induced turbulence model, was proposed. Therein, an assumption was introduced that the turbulent mixing length is proportional to the depth of the impact craters. The constant of proportionality was determined from the existing
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