Author(s): Ivar Horjen
Linked Author(s):
Keywords: No Keywords
Abstract: A new time-dependent model for combined snow and sea spray icing is presented. In the wet icing mode the icing surface is covered by a thin film consisting of a slush of brine and solid snow. The model is based upon four differential equations for this film: the conservation equations of liquid mass (brine + melted snow), solid mass (unmelted snow), heat and salt content. The results of several sensitivity tests are presented. They show similar variations as a pure spray icing model, the main difference being an increase in total ice load. For a vessel icing simulation with a horizontal visibility of 1 km (i. e. snow concentration about 0.28 g/m3) and typical "North Sea conditions", 140 - 170% more ice accreted during strong breeze conditions (10 - 14 m/s), while the increase was 200-270 % during gale conditions (18 - 20 m/s). It turns out that the ice load varies more or less as the square root of the snow concentration.
Year: 1990