| 衬垫与箱壁间空隙对苹果预冷效果的影响 |
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| 作者姓名： | 宫亚芳 曹玉会 |
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| 作者单位： | 中国科学院大学工程科学学院, 北京 100049 |
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| 基金项目： | 科技部“十三五”国家重点基础研发计划重点专项（2016YFD0400100）资助 |
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| 摘 要： | 为确保果蔬品质、延长储存期和货架期，采收后快速预冷去除田间热是冷链物流的关键环节。装有内部衬垫和产品的包装箱内部结构复杂，导致严重的冷却异质性。着眼于内部衬垫设计对苹果预冷效果的影响，尝试给出衬垫与箱壁间空隙的最佳宽度。以目前市场上广泛使用的瓦楞双层苹果包装箱为研究对象，建立三维模型，采用直接计算流体力学方法研究苹果的预冷过程。研究结果表明：增大空隙宽度是缩短预冷时间，提高预冷均匀性的有效方法；但是，空隙宽度不能无限增大；综合考虑空隙宽度增量对预冷时间和预冷均匀性的影响，衬垫与箱壁间空隙宽度的最佳增量为7.5 mm；此时能获得较短的预冷时间和较好的预冷均匀性。
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| 关 键 词： | 差压预冷 直接CFD模拟 衬垫设计 预冷时间 预冷均匀性 |
| 收稿时间： | 2020-02-07 |
| 修稿时间： | 2020-04-08 |
Effect of the gap width between tray and box wall on the precooling effectiveness of apples |
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| Authors: | GONG Yafang CAO Yuhui |
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| Institution: | College of Engineering Sciences, University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Rapidly removing field heat after harvest is a key step in food cold chain logistics to ensure the good quality of fruits and vegetables and consequently extend their storage and shelf life. The internal structure of package filled with trays and products is complex, resulting in serious cooling heterogeneity. The present study focuses on the effect of tray design on the precooling process of apples and attempts to give the optimal gap width between tray and box wall. The widely-used corrugated double-layered apple packaging box in the market was chosen as the research object, a three-dimensional model was established, and the precooling process of apples was studied by using the direct computational fluid dynamics (CFD) simulation method. Results indicate that increasing the gap width is an effective way to shorten the precooling time and improve the precooling uniformity. However, the gap width can not be increased infinitely. Therefore, considering the influence of the gap width increment on both the precooling time and the uniformity of apple temperature, the optimal gap width increment between the tray and the box wall should be 7.5 mm. This results in shorter precooling time and better precooling uniformity. |
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| Keywords: | forced-air precooling direct computational fluid dynamics(CFD) simulation tray design precooling time precooling uniformity |
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