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An experimental study of drying behaviour in ice patterns formed during spin freezing and its influence on the freeze-drying process

机译：旋转冷冻过程中冰样干燥行为及其对冷冻干燥过程影响的实验研究

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摘要

An experimental study on formation of ice patterns during spin freezing of liquid in vials and the effect of such ice patterns in the freeze-drying process is investigated. The process is carried out in vials for liquids such as distilled water and skimmed milk which are immersed and spun in a temperature control bath maintained at -25 degrees C. The occurrence of different ice patterns are demonstrated using two vials with l/d ratio of 2.4 (V-1) and 3.9 (V-2) with the liquid fill volume varied between 20% and 85%. It is observed that depending on the l/d ratio, speed of rotation and fill volume, different ice patterns such as spiral, cone shape and uniform annular patterns occur. Also, the subsequent drying process effectively depends on the type of ice pattern that resulted in the freezing process. Among the different ice patterns, the uniform annular pattern exhibited a better drying rate.
机译：研究了液体在小瓶中旋转冷冻过程中形成冰纹的实验研究，以及这种冰纹在冷冻干燥过程中的作用。该工艺在盛有蒸馏水和脱脂牛奶等液体的小瓶中进行，然后将其浸入并保持在-25℃的温度控制浴中旋转。使用两个L / d比为1的小瓶演示了不同冰模式的发生。 2.4（V-1）和3.9（V-2），液体填充量在20％和85％之间变化。观察到，取决于l / d比，旋转速度和填充量，会出现不同的冰图案，例如螺旋形，圆锥形和均匀的环形图案。而且，随后的干燥过程实际上取决于导致冷冻过程的冰模式的类型。在不同的冰图案中，均匀的环形图案表现出更好的干燥速率。

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