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Time Dependence of Component Temperatures in Microwave Heated Immiscible Liquid Mixture
Journal of Microwave Power and Electromagnetic Energy ( IF 1.5 ) Pub Date : 2008-01-01 , DOI: 10.1080/08327823.2008.11688612
Alvin Kennedy 1 , Aron Reznik , Solomon Tadesse , Janine Nunes
Affiliation  

Measured influence of microwave heating on time dependencies of component temperatures for two immiscible liquids in a mixture shows differences for polar (water) and non-polar (cyclohex-ane or carbon tetrachloride) liquids. The rate of increase for the temperature of water with time of microwave heating is larger than other liquids in the mixture (maximum rate of temperature growth for water is 8 times larger than corresponding rate for carbon tetrachloride and 2 times larger than cyclohexane). This leads to creating, for a considerable time period, a unique environment where there is a significant temperature difference between two liquids in a mixture. The maximum value of the difference between water and carbon tetrachloride temperatures in the mixture was 107 °C at 300 sec of microwave heating. While the maximum value of the difference between water and cyclohexane temperatures in the mixture was 57 °C at 135 sec microwave heating. This suggests that electromagnetic waves lose most of their energy to polar liquids (water), while the difference in rates of temperature growth for carbon tetrachloride and cyclohexane can be explained by different mechanisms of heat transfer from water to cyclohexane (conduction and convection) and to carbon tetrachloride (conduction only). Semi-empirical mathematical models for the time dependencies of temperature growth for components of the mixtures gave good correlation with experimental data (relative error less than 9%). These results can be used to model the temperature kinetics of components for other multi-phase immiscible liquid mixtures.

中文翻译:

微波加热不混溶液体混合物中组分温度的时间依赖性

微波加热对混合物中两种不混溶液体的组分温度时间依赖性的测量影响表明极性(水)和非极性(环己烷或四氯化碳)液体存在差异。微波加热时水的温度随时间的上升速度比混合物中的其他液体大(水的最大温度上升速度是四氯化碳相应速度的8倍,环己烷的2倍)。这导致在相当长的一段时间内形成一种独特的环境,其中混合物中的两种液体之间存在显着的温差。在微波加热 300 秒时,混合物中水和四氯化碳温度之间差异的最大值为 107 °C。而混合物中水和环己烷温度之间的差异的最大值在 135 秒微波加热下为 57 °C。这表明电磁波将大部分能量损失给极性液体(水),而四氯化碳和环己烷的温度增长速率的差异可以用从水到环己烷的不同传热机制(传导和对流)和四氯化碳(仅导电)。混合物组分温度增长的时间依赖性的半经验数学模型与实验数据具有良好的相关性(相对误差小于 9%)。这些结果可用于模拟其他多相不混溶液体混合物组分的温度动力学。
更新日期:2008-01-01
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