Roughness characteristics in aufeis morphology
Aufeis (also referred to as icing, or as naleds in Russian) are spreading and thickening ice accretions that form in cold air when a shallow sheet of water flows over a cold surface and progressively freezes on it. Aufeis formation was simulated on a sloped planar aluminum surface subject to wind. An initial morphologies of aufeis appeared wavelike (or terraced), and its roughness spacing and height varied with slope and wind speed. This paper proposes a theoretical model to explain the roughness characteristics of the initial aufeis morphology. Water is introduced from the top of a plane set in a cold room, and the resulting supercooled water is driven by gravity and wind drag. In this model, ice grows from the water film by releasing latent heat to the air by convection and by heat conduction into an aluminum substrate beneath the ice sheet. The water and air boundary layers are simultaneously disturbed due to change in the ice shape and the disturbed water flow interacts with the air flow. Applying linear stability analysis on this air/water/ice/aluminum multiphase system, the effects of the water supply rate, plane slope, and air stream velocity on the spacing and height of ice surface roughness were investigated. It was found that air shear stress disturbances at the water-air interface affect the convective heat transfer rate and the ice growth conditions.
Kazuto Ueno Masoud Farzaneh
NSERC/Hydro-Quebec/UQAC Industrial Chair on Atmospheric Icing of Power Network Equipment (CIGELE) and Canada Research Chair on Atmospheric Icing Engineering of Power Networks (INGIVRE), www.cigele.ca Universite du Quebec a Chicoutimi, Chicoutimi, QC, Canada
国际会议
The 14th International Workshop on Atmospheric Icing of Structures(第十四届结构物大气覆冰国际研讨会 IWAIS 2011)
重庆
英文
74
2011-05-08（万方平台首次上网日期，不代表论文的发表时间）