Author(s): R. Z. Blackmore; E. P. Lozowski
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Keywords: No Keywords
Abstract: Ship spray icing is a complicated process and it is not surprising therefore, that the various numerical modelling approaches that have come forth should be complex. The present work yields an uncomplicated physical model of vessel icing. The model is documented in full, and uses known parameters. However, unlike most approaches, a heat balance is applied to the wind-rafted spray/air mixture within the cloud, and not at the ice surface on the vessel. The heat balance assumes supercooling of the brine in the spray cloud and ice is assumed to accrete on the ship according to a supercooling/latent heat exchange at the vessel icing surface. The model uses a spray flux intensity and time averaged spray access area that are derived empirically. The model is tested against an independent data set and shows good agreement. It compares favorably with the Kachurin ship icing nomogram. A sensitivity analysis of selected input parameters is presented and discussed. The vessel icing model has confirmed that the dynamics and thermodynamics of the spray cloud may be influential factors in vessel icing, and should therefore be accounted for in ship icing models.
Year: 1992