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Computer simulation of radio frequency selective heating of insects in soybeans

机译:大豆中昆虫的射频选择性加热的计算机模拟

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摘要

Radio frequency (RF) treatments have potential as alternatives to chemical fumigation for disinfesting legumes. This study was conducted to investigate the feasibility of RF selective heating of insect larvae in 3 kg soybeans packed in a rectangular plastic container (30 × 22 × 6 cm~3) using a 6 kW, 27.12 MHz RF heating system. A finite element based computer simulation program-COMSOL was used to solve the coupled electromagnetic and heat transfer equations for developing a simulation model. Indianmeal moth larvae were selected as the target insect for experimental validation of the simulation results. Simulated and experimental temperatures of insects and soybeans after 6 min RF heating were compared in top, middle, and bottom layers within the container. Both results showed that insect larvae were differentially heated with 5.9-6.6 ℃ higher than host soybeans when RF heated from 25 to 50 ℃. These results revealed that the heating rate of insects was 1.4 times greater than that of soybeans. The validated simulation results demonstrated that placing the insect on the cold spot of each layer, or horizontally, and large insect size may cause less selective heating within the insect bodies. Dielectric properties of insects may also influence the preferential heating patterns. The selective heating of insects in soybeans may provide potential benefits in developing practical RF treatments to ensure reliable control of insect pests without adverse effects on product quality.
机译:射频(RF)处理有潜力替代除害豆科植物的化学熏蒸法。这项研究旨在研究使用6 kW,27.12 MHz RF加热系统对3 kg装在矩形塑料容器(30×22×6 cm〜3)中的大豆中的昆虫幼虫进行RF选择性加热的可行性。使用基于有限元的计算机仿真程序COMSOL来求解耦合的电磁和热传递方程,以开发仿真模型。选择印度粉蛾幼虫作为目标昆虫,对模拟结果进行实验验证。在容器中的顶层,中层和底层,比较了射频加热6分钟后昆虫和大豆的模拟和实验温度。两种结果都表明,当RF从25℃加热到50℃时,昆虫幼虫的温度要比寄主大豆高5.9-6.6℃。这些结果表明,昆虫的加热速率是大豆的1.4倍。经过验证的仿真结果表明,将昆虫放置在每层的冷点或水平放置,并且昆虫较大,可能会导致昆虫体内选择性加热的减少。昆虫的介电特性也可能影响优先加热方式。大豆中昆虫的选择性加热可为开发实用的RF处理方法提供潜在的好处,以确保可靠地控制害虫而不会对产品质量产生不利影响。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2015年第11期|406-417|共12页
  • 作者单位

    College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China;

    College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China;

    College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China,Department of Biological Systems Engineering, Washington State University, Pullman, WA 99164-6120, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Computer simulation; Insect control; RF energy; Differential heating; Soybean;

    机译:计算机仿真;昆虫控制;射频能量差异加热;黄豆;

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