Experimental and numerical study on heat and mass transfer of Zanthoxylum bungeanum microwave drying

IF 5.4 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress Pub Date : 2025-09-22 DOI:10.1016/j.tsep.2025.104137

Yao Zhang , Yuhong Du , Yuanyuan Li , Tao He , Tao Hong , Dezhi Gou , Nouman Rasool , Shunmin Zhu , Zhengming Tang

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引用次数: 0

Abstract

Microwave-assisted dehydration has gained many applications in agricultural processing, yet its application to Zanthoxylum bungeanum remains underexplored. Besides, the heat and mass transfer process of the Zanthoxylum bungeanum sample during the microwave drying process, remains poorly understood. To fill this research gap, this work investigates the drying characteristics of Zanthoxylum bungeanum in microwave ovens under different conditions through a combined approach of numerical simulation and experimental validation. We first developed a multiphysics coupled numerical model for the microwave drying of Zanthoxylum bungeanum in COMSOL Multiphysics, with the measured dielectric properties of Zanthoxylum bungeanum. Then, the numerical model was validated with experiments. Subsequently, with the aid of the validated numerical model, we investigated the effects of microwave power and sample layer thickness on the drying process. Parametric analysis revealed non-uniform moisture distribution characterized by central accumulation and edge dehydration under microwave drying conditions. Its moisture gradient ranges from 3.32 % to 7.38 %. Meanwhile, both power and thickness significantly affect the moisture variation coefficient, with ranges of 0.31–0.89 and 0.55–0.90, respectively. In addition, the layer thickness optimisation shows that the temperature variation coefficient is less than 0.15 at 9 mm, and the heating efficiency is higher than 80 %. These findings provide valuable insight into the heat and mass transfer process of Zanthoxylum bungeanum during microwave driving and the application of microwave-assisted dehydration in Zanthoxylum bungeanum, but also guide the microwave drying of other food crops.

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花椒微波干燥传热传质的实验与数值研究

微波辅助脱水在农业加工中得到了广泛的应用，但微波辅助脱水在花椒中的应用还有待进一步探索。此外，花椒样品在微波干燥过程中的传热传质过程尚不清楚。为了填补这一研究空白，本文采用数值模拟与实验验证相结合的方法，研究了花椒在不同条件下在微波炉中的干燥特性。本文首先在COMSOL multiphysics中建立了花椒微波干燥的多物理场耦合数值模型，并测量了花椒的介电特性。通过实验对数值模型进行了验证。随后，借助验证的数值模型，研究了微波功率和样品层厚对干燥过程的影响。参数分析表明，微波干燥条件下水分分布不均匀，主要表现为中心积聚和边缘脱水。其湿度梯度为3.32% ~ 7.38%。同时，功率和厚度对水分变异系数影响显著，范围分别为0.31 ~ 0.89和0.55 ~ 0.90。此外，层厚优化表明，在9 mm处温度变化系数小于0.15，加热效率高于80%。这些研究结果为深入了解花椒在微波驱动过程中的传热传质过程以及微波辅助脱水在花椒中的应用提供了有价值的见解，同时也为其他粮食作物的微波干燥提供了指导。

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

Thermal Science and Engineering Progress Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

7.20

自引率

10.40%

发文量

327

审稿时长

41 days

期刊介绍： Thermal Science and Engineering Progress (TSEP) publishes original, high-quality research articles that span activities ranging from fundamental scientific research and discussion of the more controversial thermodynamic theories, to developments in thermal engineering that are in many instances examples of the way scientists and engineers are addressing the challenges facing a growing population – smart cities and global warming – maximising thermodynamic efficiencies and minimising all heat losses. It is intended that these will be of current relevance and interest to industry, academia and other practitioners. It is evident that many specialised journals in thermal and, to some extent, in fluid disciplines tend to focus on topics that can be classified as fundamental in nature, or are ‘applied’ and near-market. Thermal Science and Engineering Progress will bridge the gap between these two areas, allowing authors to make an easy choice, should they or a journal editor feel that their papers are ‘out of scope’ when considering other journals. The range of topics covered by Thermal Science and Engineering Progress addresses the rapid rate of development being made in thermal transfer processes as they affect traditional fields, and important growth in the topical research areas of aerospace, thermal biological and medical systems, electronics and nano-technologies, renewable energy systems, food production (including agriculture), and the need to minimise man-made thermal impacts on climate change. Review articles on appropriate topics for TSEP are encouraged, although until TSEP is fully established, these will be limited in number. Before submitting such articles, please contact one of the Editors, or a member of the Editorial Advisory Board with an outline of your proposal and your expertise in the area of your review.