A Composite Microwave Cavity for Liquid Volume Fraction and Simultaneous Phase Permittivity Measurements

IF 2.5 4区工程技术 Q3 CHEMISTRY, PHYSICAL

International Journal of Thermophysics Pub Date : 2024-11-23 DOI:10.1007/s10765-024-03451-y

Liam D. Tenardi, Matthew G. Hopkins, Markus Richter, Eric F. May, Paul L. Stanwix

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Abstract

Microwave resonators are a technology with the potential to automate the rapid acquisition of vapour-liquid equilibrium data in multicomponent mixtures. However, the re-entrant resonators commonly used for fluid characterization have limited ability to mix or drain adequately due to the bulbs and narrow gaps used within the sample volume to spatially distribute the sensing regions with intense electric fields. This work describes a novel composite cavity combining two toroidal split-ring resonators and a cylindrical resonator, each sealed and partially filled with the polymer PEEK, to spatially separate sensing regions whilst maintaining an unobstructed sample volume. This unique design also allows for the total sample volume to be an order-of-magnitude smaller than conventional microwave cavities, without significantly increasing the resonant frequencies. Mass transfer between phases is facilitated by mechanical agitation, reducing equilibration time. Finite element analysis (FEA) is used to model how the dielectric interfaces within the cavity perturb electric field distributions. This model is used to interpret measurements of two-phase propane to quantify liquid volume fraction and phase dielectric permittivities.

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用于液体体积分数和相位脆性同步测量的复合微波腔体

微波谐振器是一种具有自动快速获取多组分混合物汽液平衡数据潜力的技术。然而，用于流体表征的常用重入式谐振器在充分混合或排水方面能力有限，这是因为在样品体积内使用了灯泡和窄间隙来在空间上分布具有强电场的传感区域。这项研究介绍了一种新型复合腔体，它结合了两个环形分环谐振器和一个圆柱形谐振器，每个谐振器都密封并部分填充聚合物 PEEK，从而在保持样品体积畅通无阻的同时，在空间上分离传感区域。这种独特的设计还使样品总体积比传统微波腔小一个数量级，而不会显著增加谐振频率。机械搅拌促进了相间的质量传递，缩短了平衡时间。有限元分析（FEA）用于模拟空腔内的电介质界面如何扰动电场分布。该模型用于解释两相丙烷的测量结果，以量化液体体积分数和相介电常数。

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来源期刊

International Journal of Thermophysics 物理-力学

CiteScore

4.10

自引率

9.10%

发文量

179

审稿时长

5 months

期刊介绍： International Journal of Thermophysics serves as an international medium for the publication of papers in thermophysics, assisting both generators and users of thermophysical properties data. This distinguished journal publishes both experimental and theoretical papers on thermophysical properties of matter in the liquid, gaseous, and solid states (including soft matter, biofluids, and nano- and bio-materials), on instrumentation and techniques leading to their measurement, and on computer studies of model and related systems. Studies in all ranges of temperature, pressure, wavelength, and other relevant variables are included.