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A study of cooling rate of the supercooled water inside of cylindrical capsules

机译:圆柱胶囊内部过冷水冷却速率的研究

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An experimental apparatus was developed to investigate the supercooling phenomenon of pure water inside cylindrical capsules used for cold storage process. The Phase Change Material (PCM) used was distilled water. The external coolant material was a water-alcohol mixture (50% vol.), controlled by a constant temperature bath (CTB) in four fixed values (-4℃, -6℃, -8℃, and -10℃). Temperatures varying with time were measured inside and outside the capsule. Cylindrical capsules with internal diameter of 30 mm, 45 mm, and 80 mm, with 1.5 mm wall thickness were made in aluminum, bronze or acrylic materials. The Cooling Rate (CR) was investigated for different positions on the internal wall of the capsule, for different external coolant temperatures (T{sub}c), different capsules diameters and different materials. The results showed that the cooling rate is a strong function of the angular position on the internal wall, the coolant temperature, the capsule material, and the capsule's diameter.
机译:开发了一种实验装置来研究用于冷藏过程的圆柱形胶囊内部纯净水的过冷现象。使用的相变材料(PCM)是蒸馏水。外部冷却剂是水-酒精混合物(50%体积),由恒温浴(CTB)控制为四个固定值(-4℃,-6℃,-8℃和-10℃)。在胶囊内部和外部测量随时间变化的温度。内径分别为30毫米,45毫米和80毫米,壁厚1.5毫米的圆柱形胶囊由铝,青铜或丙烯酸材料制成。对于胶囊内壁上的不同位置,不同的外部冷却剂温度(T {c}),不同的胶囊直径和不同的材料,研究了冷却速率(CR)。结果表明,冷却速度是内壁角位置,冷却液温度,胶囊材料和胶囊直径的强函数。

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