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首页> 外文学位 >Electrothermal effects of ohmic heating on biomaterials: Temperature monitoring, heating of solid-liquid mixtures, and pretreatment effects on drying rate and oil uptake.
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Electrothermal effects of ohmic heating on biomaterials: Temperature monitoring, heating of solid-liquid mixtures, and pretreatment effects on drying rate and oil uptake.

机译：欧姆加热对生物材料的电热效应：温度监控，固液混合物的加热以及预处理对干燥速率和吸油率的影响。

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摘要

One of the main challenges in establishing a safety protocol for a continuous flow aseptic processing system is an accurate time-temperature heating data for both solid and liquid phases. The use of cholesteric liquid crystal sheets for temperature determinations in such a system is promising. However, this measurement technique is prone to errors due to variations in viewing and light source angles as well as the length of use of the liquid crystal sheet as demonstrated in our study.;Ohmic heating rates of a suspended solid particle and a medium have been studied experimentally under a range of conditions. The heating rate of the inclusion particle is significantly lower than that of the medium when the medium is electrically more conductive than the solid particle. Under this condition, the worst-case heating occurs under a well-mixed condition. On the contrary, when the suspended solid particle is electrically more conductive than the medium, the particle heats faster than the medium. Under this condition, the worst-case heating occurs under the well-mixed condition when the particle-to-heater cross section area ratio is 0.1, but it occurs under the static condition when the ratio is 0.2. A thermal crossover may be observed after a longer duration of heating, resulting in a more conservative heating under the mixed condition.;A modeling study to compare predictions of cold spot temperatures by the Laplace Equation No Convection (LENC) model and the Circuit Analogy Mixed Fluid (CAMF) model is also incorporated. Results suggest that the CAMF model is more conservative when the cold spot is within the solid particle, but the LENC model is generally conservative when the cold spot is within the medium.;The possibilities of applying ohmic heating as a pretreatment to increase the drying rate of grape berries and reduce oil absorption during frying and subsequent cooling of potato slices are also explored. We find that the drying rate of grapes is significantly increased by the ohmic pretreatment. Total oil uptake during frying and subsequent cooling of potato slices is decreased by an ohmic pretreatment without involving a liquid medium (direct sandwiching of slices between two electrodes).
机译：为连续流无菌处理系统建立安全协议的主要挑战之一是对固相和液相的准确的时间-温度加热数据。在这种系统中将胆甾型液晶片用于温度测定是有希望的。然而，如我们的研究所示，由于视角和光源角度以及液晶片的使用时间的变化，该测量技术容易出现误差。;悬浮固体颗粒和介质的热加热速率一直很高在一系列条件下进行了实验研究。当介质的电导率比固体颗粒的电导率高时，夹杂物颗粒的加热速率明显低于介质的加热速率。在这种条件下，最坏的情况是在充分混合的条件下发生的。相反，当悬浮的固体颗粒的电导率高于介质时，颗粒的加热速度快于介质。在这种条件下，当颗粒与加热器的横截面积之比为0.1时，最坏情况的加热发生在充分混合的条件下，而当该比率为0.2时，则在静态条件下发生。长时间加热后可能会出现热交叉现象，导致混合条件下的加热更为保守。一项模型研究，通过拉普拉斯方程无对流（LENC）模型和电路模拟混合比较了冷点温度的预测流体（CAMF）模型也已合并。结果表明，当冷点位于固体颗粒内时，CAMF模型更为保守，而当冷点位于介质中时，LENC模型通常较为保守;采用欧姆加热作为预处理以提高干燥速率的可能性还研究了葡萄浆果的添加和减少油炸过程中的油吸收以及随后的马铃薯切片冷却。我们发现通过欧姆预处理可以大大提高葡萄的干燥速度。在不涉及液体介质的情况下，通过欧姆预处理减少了油炸和马铃薯片冷却期间的总吸油量（将片直接夹在两个电极之间）。

著录项

  • 作者

    Salengke.;

  • 作者单位

    The Ohio State University.;

  • 授予单位 The Ohio State University.;
  • 学科 Engineering Agricultural.;Engineering Chemical.
  • 学位 Ph.D.
  • 年度 2000
  • 页码 250 p.
  • 总页数 250
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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