Separation efficiency and ice strength properties in simulated natural freezing of aqueous solutions
John, Miia; Suominen, Mikko; Kurvinen, Emil; Hasan, Mehdi; Sormunen, Otto-Ville; Kujala, Pentti; Mikkola, Aki; Louhi-Kultanen, Marjatta (2019)
Post-print / Final draft
Cold Regions Science and Technology
School of Energy Systems
In this study, twenty similar size ice beams were prepared in freezing boxes in a temperature-controlled cold room from five different aqueous solutions – tap water, and ethanol and sodium chloride aqueous solutions of two different molalities, i.e. 0.1 mol/kg and 0.3 mol/kg. The bending strength and natural frequencies of the ice samples were measured in the freezing conditions, and the concentrations of impurities in melted ice samples were determined. The research shows that with the ethanol and sodium chloride solutions, the concentration of impurities inside the ice clearly decreased in comparison to the initial solution. The structure of the ice from the different solutions differed significantly; as the tap water formed columnar ice, ethanol ice grew through large platelets, while the structure of the sodium chloride ice was a mixture of the two forms. The tap water yielded the highest strength ice and the ice formed from the ethanol aqueous solutions the weakest ice. The measurements indicated that the concentration of impurity in the ice reduces the mechanical strength and the magnitude of the effect varies with the chemical characteristic of impurity.
John, M., Suominen, M., Kurvinen, E., Hasan, M., Sormunen, O-V., Kujala, P., Mikkola, A., Louhi-Kultanen, M. (2019). Separation efficiency and ice strength properties in simulated natural freezing of aqueous solutions. Cold Regions Science and Technology, Vol 158, Issue February 2019, p. 18-29. DOI: 10.1016/j.coldregions.2018.11.006
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