SIZE AND SHAPE EFFECT ON NONUNIFORMITY OF TEMPERATURE AND MOISTURE DISTRIBUTIONS IN MICROWAVE HEATED FOOD MATERIALS: PART I SIMULATION
SIZE AND SHAPE EFFECT ON NONUNIFORMITY OF TEMPERATURE AND MOISTURE DISTRIBUTIONS IN MICROWAVE HEATED FOOD MATERIALS: PART I SIMULATION
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DOI：
10.1111/j.1745-4530.1998.tb00448.x
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发表时间：
1998-08
影响因子：
3
通讯作者：
R. S. Vilayannur;V. Puri;R. Anantheswaran
中科院分区：
文献类型：
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作者：
R. S. Vilayannur;V. Puri;R. Anantheswaran
使用有限元模型 (FEM) 计算不同形状（砖形、圆柱体和六角棱柱形）、尺寸（75、90 和 105 cm 3 ）和高度与底部尺寸比（DR = 0.25 至 1.75）的马铃薯样品的温度和湿度分布。对于所考虑的三个产品体积中的每一个，发现与砖（7.0至7.5℃）和圆柱形产品（5.2至8.2℃）相比，六角棱柱形产品（产品体积90cm 3 的SDT范围为4.9至6.4℃）的温度分布不均匀性（如产品内温度（SDT）分布的标准偏差所示）较低。然而，与砖形产品（48 秒）和圆柱形产品（44 秒）相比，六棱柱形产品达到相同最高温度 80°C 的时间更长（产品体积为 90 cm 3 且 DR = 1.0 时为 61 秒）。对于所考虑的情况，对于砖形和六角形产品，随着产品体积从 75 cm 3 增加到 105 cm 3 ，温度和湿度分布的不均匀性增加。小体积（75 cm 3 ）和小半径的圆柱形产品表现出高温不均匀性。所有考虑的产品形状中的水分不均匀性均受到面积的影响。
Temperature and moisture distributions were calculated using a finite element model (FEM) in potato samples of different shapes (brick-, cylinder-, and hexagonal prism-shaped), sizes (75, 90, and 105 cm 3 ) and height to base dimension ratios (DR = 0.25 to 1.75). For each of the three product volumes considered, the nonuniformity in temperature distribution (as indicated by the standard deviation of temperature (SDT) distribution within the product) was found to be lower in the case of hexagonal prism-shaped products (SDT ranged from 4.9 to 6.4 C for product volume of 90 cm 3 ) when compared with brick (7.0 to 7.5 C) and cylinder-shaped products (5.2 to 8.2 C). The time to reach the same maximum temperature of 80C, however, was longer in hexagonal prism-shaped products (61 s for product volume of 90 cm 3 and DR = 1.0) when compared to brick (48 s) and cylinder-shapes (44 s). For the cases considered, the nonuniformity of temperature and moisture distribution increased as the product volume increased from 75 to 105 cm 3 , in the case of brick-, and hexagonal-shaped products. Cylindrical products of low volumes (75 cm 3 ) and low radii showed high temperature nonuniformity. The moisture nonuniformity in all the product shapes considered was influenced by the area.