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Study on the Mechanisms in Generating Pancake Ice by Using Two Particles Model of Frazil Ice

Author(s): Takanori Ito; Shigeki Sakai

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Abstract: One of driving forces for the ocean circulation is discharge of the salinity accompanying growth of the sea ice in polar regions. Pancake ice is especially growing faster than other sea ices in order to exchange heat actively. Therefore, it becomes important factor for climate change. The initial pancake ice is generated by solidifying frazil ice crystals which are millimeter sized particles. However, it is unknown about the formation mechanism of it. The previous model, two cube particles model, has suggested the situation in consolidating frazil ice. It is that the negative pressure in liquid bridge exerted attraction force to the particles, while wave force by acceleration is applied to pull away to them. They are consolidated if the pressure in liquid bridge between them is stronger than the wave force exerted on them. The model has had the difference to the real phenomenon from the shape of particles. This study aims to make the previous model improved. In a new model, we assume two spheres of equal diameter as frazil ice at water surface in a wave field. The water rise level (capillary rise) and the shape of water surface between the particles is calculated by using Young-Laplace equation for threedimensional field as same as existing methods. The value of them is required to evaluate pressure in the liquid bridge. In this study, it is possible that the liquid bridge of sphere model is rising smaller than those of cube model. Therefore, it is supposed to properly calculate the liquid bridge force exerted on frazil ice. Further, by varying the wave conditions, the validity about the model is examined compared with the ice tank experiment.


Year: 2012

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