电磁场强化真空水滴闪蒸成冰理论分析

Theoretical analysis on intensified impact on water vacuum flash in electromagnetic field

针对目前真空制冰装置体积较大、日制冰量有待提高的问题,通过对相关的外界物理场对物化性质、结晶过程、传热传质的国内外研究状况的综述,根据建立的稳态蒸发结冰分相能量方程,指出真空制冰中冷量主要来自闪蒸过程中冰层升华所要吸收的潜热;潜热量的大小决定于单位时间水滴质量变化率即表面扩散系数;电磁场使水体系热力学能绝对值降低,则其黏度和表面张力也降低;电磁场在水滴在真空状态下闪蒸过程中,影响其物理性质和复杂的分子结构,增加水的活性,有益于扩散系数的增大,从而强化二元冰形成过程中的传热传质.

In view of the problem that vacuum ice-making equipment is of large size and its daily icemaking volume is expected to be raised, a separated phase energy equation of homeostasis evaporate freezing is set up by the help of researching home and abroad on physical and chemical properties, crystallization process, heat and mess transfer in external physical field. It indicates that the cold resource mainly comes from the absorbed latent heat when ice layer is sublimating in flash process, the latent heat volume is decided on the mass change of the drop in unit time （the surface diffusion coefficient）, and electromagnetic field reduces the absolute value of water system internal energy, as well as the viscosity and surface tension. It also indicates that during the water vacuum flash process electromagnetic field has influence on water physical property and complicated molecular structure, enhances the water activity, benefits the enlargement of surface diffusion coefficient, and enhances the heat and mess transfer in forming process of the binary ice.