Abstract
Ice slurry displays many advantages as a phase-change material for its high energy density and flowability. In typical mechanical scraping method, the strong interaction of ice with solid surface causes the problem of high energy consumption and damage of scrapers. Ice slurry generation process will be efficient if the ice adhesion strength could be reduced. In this paper, urea was proposed as an additive to depress ice adhesion in solutions. Ice particles was scoured easily by liquid flow and ice slurry was generated spontaneously. The thermal transition property, solidification morphology and adhesion characteristic of urea aqueous solutions were investigated respectively. Results show that the latent heat of urea solution was higher than other candidate solutions. Micro liquid film was observed at the solidification–substrate interface when the solution was in solid-liquid two-phase state. This phenomenon explains the lower adhesion strength of ice in aqueous solutions.
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