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首页> 外文期刊>Journal of food engineering >Airflow measurement techniques for the improvement of forced-air cooling, refrigeration and drying operations
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Airflow measurement techniques for the improvement of forced-air cooling, refrigeration and drying operations

机译：气流测量技术，用于改善强制空气冷却，制冷和干燥操作

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Flowrate and distribution of air is a critical design factor in the cooling, refrigeration and drying of horticultural food products. These operations rely on a constant supply of air distributed throughout bulk arrangements of the produce. Local distribution of the air is critical to optimising the design and efficiency of these processes. Identification of the key parameters affecting the airflow distribution has been done either experimentally (using intrusive point-wise or bulk measurement techniques) or numerically. The detailed information provided by the use of computational fluid dynamic models has facilitated unique opportunities to investigate alternative system designs, without the need for expensive and time consuming experiments. This study provides a review of the techniques available to measure airflow (thermal and rotatory vane anemometry, pressure differential devices, tracer gases, LDA and PIV). Their advantages and disadvantages (accuracy, resolution, application range, cost, and ease of use) as well as their application in the validation of numerical models are reviewed. The novel and scientifically based design guidelines developed by a better understanding of the airflow behaviour within the system for each of the operations under study are also presented.
机译：空气的流量和分配是园艺食品冷却，冷冻和干燥的关键设计因素。这些操作依赖于恒定的空气供应，这些空气分布在整个农产品的大宗布置中。空气的局部分布对于优化这些过程的设计和效率至关重要。确定影响气流分布的关键参数的方法是通过实验（使用点侵入式或整体测量技术）或通过数值进行的。通过使用计算流体动力学模型提供的详细信息，为研究替代系统设计提供了独特的机会，而无需进行昂贵且费时的实验。这项研究概述了可用于测量气流的技术（热和旋转叶片风速仪，压差设备，示踪气体，LDA和PIV）。回顾了它们的优缺点（准确性，分辨率，应用范围，成本和易用性）以及它们在数值模型验证中的应用。还介绍了通过更好地了解所研究的每个操作在系统内的气流行为而开发的新颖，科学的设计准则。

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