Effect of fan speed, sample orientation, and tray structure on heat transfer and food freezing time in batch air blast freezer

IF 4.9 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2025-04-04 DOI:10.1016/j.ijthermalsci.2025.109915

Zheng Xu , Mark Anthony Redo , Yvan Llave , Yasushi Koga , Manabu Watanabe

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引用次数: 0

Abstract

The batch air blast freezer is commonly used in the food industry, but nonuniform airflow distribution has been an on-going challenge. In this study, experiments and numerical simulations were performed to investigate the effects of varying the fan speed, sample orientation, and tray structure on flow dynamics, local heat transfer coefficient, and transient temperature of loaded samples. Ice crystallization and freezing times of individual samples were predicted, and strong and weak convection locations were identified. Increasing the fan speed from 560 rpm to 840 rpm resulted in a 34%–39% increase in the average surface heat transfer coefficient of the samples in weak convection locations, leading to a reduction in ice crystallization and total freezing times by 20%–29%. The change in sample orientation exhibited a slight difference in freezing time, but the transition from trays to wire shelves demonstrated a substantial enhancement in convective heat transfer by 19%–22%, reducing the total freezing time by 10%–13%.

查看原文本刊更多论文

风机转速、样品方向和托盘结构对间歇式鼓风冷冻机传热和食品冷冻时间的影响

间歇式鼓风冷冻机是食品工业中常用的冷冻机，但气流分布不均匀一直是一个难题。本研究通过实验和数值模拟研究了不同风扇转速、样品方向和托盘结构对加载样品的流动动力学、局部传热系数和瞬态温度的影响。预测了单个样品的冰结晶和冻结时间，确定了对流强弱位置。将风扇转速从560转/分提高到840转/分，弱对流位置样品的平均表面传热系数提高34% ~ 39%，导致冰结晶和总冻结时间减少20% ~ 29%。样品取向的改变对冻结时间的影响不大，但从托盘到线架的转变对对流换热的影响显著增强了19%-22%，使总冻结时间减少了10%-13%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Thermal Sciences 工程技术-工程：机械

CiteScore

8.10

自引率

11.10%

发文量

531

审稿时长

55 days

期刊介绍： The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review. The fundamental subjects considered within the scope of the journal are: * Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow * Forced, natural or mixed convection in reactive or non-reactive media * Single or multi–phase fluid flow with or without phase change * Near–and far–field radiative heat transfer * Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...) * Multiscale modelling The applied research topics include: * Heat exchangers, heat pipes, cooling processes * Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries) * Nano–and micro–technology for energy, space, biosystems and devices * Heat transport analysis in advanced systems * Impact of energy–related processes on environment, and emerging energy systems The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.