Performance evaluation and improvement of prototype rice husk fueled mixed flow rough rice dryer using CFD model

IF 2.7 3区 工程技术 Q3 ENGINEERING, CHEMICAL Drying Technology Pub Date : 2023-09-20 DOI:10.1080/07373937.2023.2252056
Mulugeta Admasu Delele, Yabebal Chekole Mihret, Jochen Mellmann
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Abstract

The majority of the rural areas in developing countries are not connected to the electric grid. Rice production produces a significant amount of rice husk as a byproduct/waste but this waste can be used as a source of energy for drying of the rough rice. The aim of this research was to evaluate the performance and improve the design and operation of a rice husk fueled mixed flow grain dryer for small scale rural farmers using a validated 3-D computational fluid dynamics (CFD) model. The model was applied to predict the airflow and heat and mass transfer characteristics of the designed prototype rough rice dryer. The model took into account the geometrical detail of the dryer assembly, the relevant boundary and initial conditions, and model input parameters. The results identified relatively stagnant regions at the top and the side walls of the dryer. The observed relatively high variation in drying air velocity distribution caused a relatively high variation in drying characteristics of the rice grain. The model was applied to modify the design and operation procedure of the dryer to improve the performance in terms of drying uniformity and drying time. After 2 h drying time, the difference between the maximum and minimum moisture content values for the original and modified design was 12.9% and 8.5%, respectively. There was an exponential relationship between drying time and drying air temperature and specific flowrate. Mixing and recirculation of the grain at 30 min interval significantly improved the uniformity of drying, and the difference between maximum and minimum moisture content after 2 h of drying was clearly reduced to 1.9%. The study indicated the capability of 3-D CFD model to improve the design and operation of mixed flow rice husk fueled dryer to attain the required performance.
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基于CFD模型的稻壳燃料混合流粗米干燥机样机性能评价与改进
发展中国家的大部分农村地区没有接入电网。大米生产产生大量的稻壳作为副产品/废物,但这种废物可以用作干燥粗米的能源。本研究的目的是利用经过验证的三维计算流体力学(CFD)模型来评估谷壳燃料混合流谷物干燥机的性能,并改进其设计和操作。将该模型应用于所设计样机的气流和传热传质特性的预测。该模型考虑了干燥机组件的几何细节、相关边界和初始条件以及模型输入参数。结果确定相对停滞的区域在顶部和侧壁的干燥器。干燥风速分布变化较大,导致稻谷干燥特性变化较大。应用该模型对干燥机的设计和操作流程进行了修改,以提高干燥均匀性和干燥时间。经过2 h的干燥后,原设计与改进设计的最大含水率值和最小含水率值的差值分别为12.9%和8.5%。干燥时间与干燥空气温度、比流量呈指数关系。每隔30 min对籽粒进行混合再循环,显著提高了籽粒干燥的均匀性,干燥2 h后籽粒最大含水率与最小含水率之差明显减小至1.9%。研究表明,三维CFD模型能够改进混合流稻壳燃料干燥机的设计和运行,使其达到要求的性能。
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来源期刊
Drying Technology
Drying Technology 工程技术-工程:化工
CiteScore
7.40
自引率
15.20%
发文量
133
审稿时长
2 months
期刊介绍: Drying Technology explores the science and technology, and the engineering aspects of drying, dewatering, and related topics. Articles in this multi-disciplinary journal cover the following themes: -Fundamental and applied aspects of dryers in diverse industrial sectors- Mathematical modeling of drying and dryers- Computer modeling of transport processes in multi-phase systems- Material science aspects of drying- Transport phenomena in porous media- Design, scale-up, control and off-design analysis of dryers- Energy, environmental, safety and techno-economic aspects- Quality parameters in drying operations- Pre- and post-drying operations- Novel drying technologies. This peer-reviewed journal provides an archival reference for scientists, engineers, and technologists in all industrial sectors and academia concerned with any aspect of thermal or nonthermal dehydration and allied operations.
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