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Dielectric heating

About: Dielectric heating is a research topic. Over the lifetime, 4088 publications have been published within this topic receiving 73914 citations. The topic is also known as: microwave heating.


Papers
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Journal ArticleDOI
W.B. Weir1
01 Jan 1974
TL;DR: In this article, a system is employed that automatically measures the complex reflection and transmission coefficients that result when a sample of material is inserted in waveguide or a TEM transmission line.
Abstract: With the advent of the computer and automatic test equipment, new techniques for measuring complex dielectric constant (e) and permeability (µ) can be considered. Such a technique is described where a system is employed that automatically measures the complex reflection and transmission coefficients that result when a sample of material is inserted in waveguide or a TEM transmission line. Measurement results of e and µ for two common materials are presented.

2,002 citations

Book
30 Jun 1988
TL;DR: A broad coverage of the theory and practice of industrial microwave heating can be found in this paper, where the authors present a broad survey of the literature on microwave heating and its applications.
Abstract: This book offers a broad coverage of the theory and practice of industrial microwave heating.

1,502 citations

Journal ArticleDOI
TL;DR: In this paper, the fundamentals of electromagnetic theory, dielectric response, and applications of microwave heating to materials processing, especially fiber composites, are reviewed in this article, and a knowledge of electromagnetic theories and dielectrics is essential to optimize the processing of materials through microwave heating.
Abstract: In microwave processing, energy is supplied by an electromagnetic field directly to the material. This results in rapid heating throughout the material thickness with reduced thermal gradients. Volumetric heating can also reduce processing times and save energy. The microwave field and the dielectric response of a material govern its ability to heat with microwave energy. A knowledge of electromagnetic theory and dielectric response is essential to optimize the processing of materials through microwave heating. The fundamentals of electromagnetic theory, dielectric response, and applications of microwave heating to materials processing, especially fiber composites, are reviewed in this article.

1,296 citations

Journal ArticleDOI
TL;DR: In this article, a resonant post technique for characterizing dielectric and magnetic materials at microwave frequencies was proposed and experimental results of the temperature dependence of the relative dielectrics constant of nonmagnetic materials with /spl epsilon/sub r/, varying from 4 to 60, and also loss tangent measurements at room temperature.
Abstract: Theory and experimental results are presented to show the possibility of using a resonant post technique for characterizing dielectric and magnetic materials at microwave frequencies. Results of the temperature dependence of the relative dielectric constant of nonmagnetic materials with /spl epsilon//sub r/, varying from 4 to 60 are presented and also loss tangent measurements at room temperature. The complex permittivity and permeability of a number of garnet materials has also been measured with 4/spl pi//spl gamma/M/sub s/ / /spl omega/ varying from 0.25 to 0.8. The measured real part of the permeability is in good agreement with the theoretical predictions of Schlomann and the imaginary part of the permeability agrees with measurements by Green et al. on similar materials.

1,247 citations

Journal ArticleDOI
TL;DR: In this paper, the basic theory underlying microwave dielectric heating and collates the data for a wide range of organic solvents which are commmonly used in microwave syntheses.
Abstract: Microwave dielectric heating is rapidly becoming an established procedure in synthetic chemistry. This review summarises the basic theory underlying microwave dielectric heating and collates the dielectric data for a wide range of organic solvents which are commmonly used in microwave syntheses. The loss tangents of the solvents, which may be related to the ability of the solvent to absorb energy in a microwave cavity, depend on the relaxation times of the molecules. These relaxation times depend critically on the nature of the functional groups and the volume of the molecule. Functional groups capable of hydrogenbonding have a particularly strong influence on the relaxation times. The relaxation times of solvents decrease as the temperature of the solvent is increased. Loss tangent data at different microwave frequencies are also presented and discussed.

1,160 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202333
202274
202169
202065
201989
201890