Author(s): Ivar Horjen
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Keywords: No Keywords
Abstract: This paper presents a new model for anti-icing calculations when heated water is used as energy supply. The water is flowing vertically upwards through a cylindrical hole in the trash rack element. As in Part 1 three geometrical forms of trash rack elements have been considered: circular cylinder, quadratic rod and slim elliptic cylinder. The major part of sensitivity tests where however made for the latter geometry. The model is used to calculate several parameters of interest: minimum anti-icing heat flux per unit area, and characteristic temperatures of the heating water when flowing through a trash rack element. Sensitivity analysis show that these parameters depend very much upon frazil concentration (when melting of colliding frazil is included), external flow speed and mass flux of heating water. At the transition between laminar and turbulent internal flow the model results changes discontinuously due to the fact that the overall heat transfer coefficient is one order higher in the turbulent regime than in the laminar regime.
Year: 1994