A novel concept on discrete samples for efficient microwave processing of materials
A novel concept on discrete samples for efficient microwave processing of materials
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DOI：
10.1016/j.ces.2008.03.037
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发表时间：
2008-06-01
影响因子：
4.7
通讯作者：
Jindamwar, Avinash
中科院分区：
文献类型：
--
作者：
Basak, Tanmay;Samanta, Sujoy Kumar;Jindamwar, Avinash
提出了一种新的离散样品概念，用于分析微波辐射下的有效加热过程。对连续样品进行了样品内平均功率吸收与样品厚度的初步研究，并确定了各种制度，这些制度可能对应于平均功率的最小值或最大值。对于这些方案中的每一个，两个离散样品片代替连续样品，使得离散样品的总厚度与连续样品的厚度相同。电场和温度已经解决了每个离散的样品层和中间空气层。空气层的厚度对于显著改变每个样品层内的波的干涉和功率吸收起着重要作用。据观察，离散的样品层表现出更大的加热速率比连续样品内，特别是对于较小的样品厚度。合适的离散样品厚度和空气层厚度的比例也显示出较大的样品厚度的大的加热速率。离散样品对优化热失控也起着重要作用。基于两个因素：“大加热速率”和“最佳热失控”，高效的加热策略已被推荐用于高损耗的食品物质，案例研究也证明了低损耗的物质。(C)2008爱思唯尔有限公司保留所有权利。
A novel concept on discrete samples has been introduced to analyze the efficient heating processes due to microwave radiations. A preliminary investigation on average power absorption within samples vs sample thickness has been carried out for continuous samples and various regimes have been identified such that these regimes may correspond to minima or maxima of average power. Two discrete sample pieces replace a continuous sample for each of these regimes such that the total thickness of the discrete samples is identical with the thickness of the continuous sample. Electric fields and temperature have been solved for each discrete sample layer and the intermediate air layer. The thickness of air layer plays a significant role to dramatically alter the interference of waves and power absorption within each sample layer. It is observed that the discrete sample layers exhibit larger heating rate than that within continuous sample especially for smaller sample thicknesses. Suitable ratios of discrete sample thickness and the thickness of air layer also show large heating rate for larger sample thicknesses. The discrete samples also play important role to optimize thermal runaway. Based on two factors: 'large heating rate' and 'optimal thermal runaway', the efficient heating strategy has been recommended for highly lossy food substances, and case studies are also demonstrated for low lossy substances. (C) 2008 Elsevier Ltd. All rights reserved.