| 摘要: |
| 本文设计并搭建了一套过冷水动态制冰系统，开发了一种可视化平板过冷却器，通过实验研究流动和换热对过冷却器内结冰行为的影响，并基于经典成核理论与边界层理论对其作用机理进行解释。实验结果表明：平板过冷却器内存在两种典型结冰行为，结冰行为一表现为过冷却器内不结冰，系统可连续制取冰浆；结冰行为二表现为过冷却器内发生结冰，系统不能制取冰浆。载冷剂进口温度过低、制冰溶液流量过大或过小均会促进结冰行为二的出现，不利于系统制冰稳定性。发生结冰行为二时，相对距离d为0.15的壁面优先发生结冰，且该处壁面的温度总低于其余区域，因此优先发生结冰的局部条件是具有更低的壁面温度。 |
| 关键词: 冰浆 流动与换热 板式换热器 结冰行为 |
| DOI： |
| Received:December 30, 2020Revised:March 30, 2021 |
| 基金项目:福建省自然科学基金(2020J01518)和福州大学国家环境光催化工程技术研究中心开放课题(NERCEP-201903)项目资助。 |
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| Experimental Study on Freezing Behavior in Flat-plate Supercooler |
|
Wang Jinhui1, Zheng Minfeng2, Li Yueling1, Liu Xi1,3, Li Xuelai1
|
| (1.College of Chemical Engineering , Fuzhou University;2.College of Ecological Environment and Urban Construction, Fujian University of Technology;3.Research Institute of Photocatalysis, Fuzhou University) |
| Abstract: |
| In this study, a dynamic ice-making system with supercooling water was designed and built, and a visual flat-plate supercooler was developed. The influence of flow and heat transfer on the freezing behavior in the flat-plate supercooler was studied by a large number of experiments, and the mechanism was explained by the classical nucleation theory and boundary layer theory. The results showed that there were two types of freezing behavior in the flat-plate supercooler: freezing behavior 1 shows that no freezing occurs in the supercooler and the system can continuously produce ice slurry, and freezing behavior 2 shows that freezing occurs in the supercooler and the system cannot produce ice slurry. The low inlet temperature of the secondary refrigerant and too large or too small flow of ice-making solutions were largely responsible for promoting the occurrence of freezing behavior 2, which was not conducive to the ice-making stability of the system. When freezing behavior 2 occurs, freezing occurs first on the wall with a relative distance d=0.15, where the temperature is always lower than that of the wall with a relative distance d=0.25, 0.35, 0.45, so the local condition for freezing to occur first is a lower wall temperature. |
| Key words: ice slurry flow and heat transfer plate heat exchanger freezing behavior |
