Design of a Measurement System for Temperature Distribution in Continuous-Flow Microwave Heating of Pumpable Fluids Using Infrared Imaging and Fiber Optic Technology

Many applications in wireless communication, microelectronics, and microwave power engineering rely on dielectrics with particular dielectric properties. This article proposes an original approach that can be used for producing materials with required complex permittivity. The technique is based on an inverted power‐law mixing rule model computing volume fractions in which three or more prime materials should be taken to get in the resulting homogeneous mixture the required dielectric properties. Functionality of the approach is demonstrated by production of composites from a polymer matrix (polymethyl methacrylate) and two inorganic fillers (silicon and alumina). The composites are made by mechanically mixing the powders and axially hot‐pressing and cooling the mixture. Complex permittivity of the samples is measured by a split‐post resonator method. Experimental data on dielectric properties of the samples help calibrate the technique; for the used powders, the Looyenga power‐law model is found to be most adequate. In the produced samples, the target values of dielectric constant are reached with a higher precision than the ones of the loss factor; however, analysis of the production process and error propagation in the computations suggest that deviations of the resultant complex permittivity fall in the anticipated ranges. Features and issues of both computational and production parts of the technique are finally discussed. POLYM. ENG. SCI., 58:319–326, 2018. © 2017 Society of Plastics Engineers

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Materials with required dielectric properties: Computational development and production of polymer‐ceramic composites

Vaucher

Yakovlev

Yeung

2017

Polymer Engineering & Sci

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Numerical modeling dynamic process of multi-feed microwave heating of industrial solution media

Yang

Sun

et al. 2016

J. Cent. South Univ.

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Recent Studies Related to Microwave Processing of Fluid Foods

Salazar-González

Martín-González

López‐Malo

et al. 2011

Food Bioprocess Technol

164

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Microwave heating is a convenient way to heat materials; it is considered to be a fast, clean, and easy to use technology. The use of microwaves for industrial food unit operations is the subject of research since several years ago. However, the application of microwaves depends, among other variables, on the dielectric properties of the material to be heated; otherwise, the efficiency of the process and the quality of the final product cannot be guaranteed. This paper reviews basic concepts related to microwaves and dielectric properties, and then it presents reported dielectric properties data for selected fluid foods and microwaveheating processes that have been recently studied. These processes are focused mainly on microbial inactivation, enzyme inactivation, chemical, physical, or sensory changes evaluation, or for reheating. The temperature uniformity is also discussed as a key issue for successful application of microwave heating, which is now applied by some companies.

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Design of a Measurement System for Temperature Distribution in Continuous-Flow Microwave Heating of Pumpable Fluids Using Infrared Imaging and Fiber Optic Technology

Cited by 10 publications

References 29 publications

Materials with required dielectric properties: Computational development and production of polymer‐ceramic composites

Materials with required dielectric properties: Computational development and production of polymer‐ceramic composites

Numerical modeling dynamic process of multi-feed microwave heating of industrial solution media

Recent Studies Related to Microwave Processing of Fluid Foods

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