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Ice growth in aviation jet fuel

机译：航空喷气燃料中的冰增长

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Experimental studies were performed to gain a better understanding of ice growth in aviation jet fuel at low temperatures. Dissolved water precipitated from fuel to form fine water droplets of diameters typically no more than 5 μm as the fuel was cooled. Some water droplets could remain in a metastable supercooled state to temperatures below -30 ℃. At temperatures below that, supercooled water droplets appeared to freeze to form metastable ice particles. Examples of this type of ice have been reported and may be stacking disordered ice (I) composed of randomly stacked layers of cubic ice (Ic) and hexagonal ice (Ih) sequences. Ice particles, exhibiting Ih polymorph characteristics, were found to nucleate and grow on surfaces at sub-zero temperatures. These hexagonal ice particles were observed to grow at the expense of the metastable ice particles near them. The observed mass transfer of water from metastable ice particles to deposition on the hexagonal ice particles in aviation jet fuel was attributed to the augmented Wegener-Bergeron-Findeisen (WBF) process and the Ostwald ripening process. The two processes supported the growth of hexagonal ice particles until the metastable ice particles near them were completely exhausted.
机译：进行实验研究以更好地了解航空喷气燃料在低温下的冰生长。从燃料中沉淀出来的溶解水会在燃料冷却时形成直径通常不超过5μm的细小水滴。某些水滴可能会在低于-30℃的温度下保持亚稳态的过冷状态。在低于该温度的温度下，过冷的水滴似乎冻结并形成亚稳态的冰粒。这类冰的例子已有报道，可能是无序冰（I）的堆积，它由立方冰（Ic）和六角形冰（Ih）序列的随机堆积层组成。发现具有Ih多晶型特征的冰粒子在零度以下的温度下成核并在表面上生长。观察到这些六角形冰粒的生长是以其附近的亚稳态冰粒为代价的。观察到的水从亚稳态冰粒传质到航空喷气燃料中六方冰粒上的沉积，归因于增强的Wegener-Bergeron-Findeisen（WBF）过程和Ostwald成熟过程。这两个过程支持六角形冰粒的生长，直到它们附近的亚稳态冰粒完全耗尽。

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