Author(s): Lasse Makkonen
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Keywords: No Keywords
Abstract: A model of initial salt entrapment in ice grown by sea spray is proposed. The model is based on the salt and heat balances of the icing surface, and includes hypotheses based on empirical data on salt rejection during ice growth. A result of the proposed theory is that the salinity of ice S is related to the salinity of sea spray Sw by Si= 0.26 Sw/ (1 - 0.74 n), where n is the freezing fraction (i. e. the ratio of the icing rate to the water impingement rate). The theory suggests that the salinity of the liquid layer on the icing surface Sb can be approximated by Sb = Si/0.26 regardless of the growth conditions. The proposed theory is incorporated into the icing model by Makkonen and Stallabrass (1984), so that the freezing fraction and the salinities and Sb are solved simultaneously by an iteration procedure. This makes it possible to calculate the icing rate of saline sea spray on marine structures. The resulting icing rates are in good agreement with icing wind tunnel experiments.
Year: 1986