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Dielectric heating

About: Dielectric heating is a(n) research topic. Over the lifetime, 4088 publication(s) have been published within this topic receiving 73914 citation(s). The topic is also known as: microwave heating.
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Journal ArticleDOI
W.B. Weir1
01 Jan 1974-
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.

1,809 citations


Book
30 Jun 1988-
Abstract: This book offers a broad coverage of the theory and practice of industrial microwave heating.

1,469 citations


Journal ArticleDOI
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.

1,187 citations


Journal ArticleDOI
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.

1,174 citations


Journal ArticleDOI
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.

1,099 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20225
202169
202065
201989
201890
2017124

Top Attributes

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Topic's top 5 most impactful authors

Shaojin Wang

54 papers, 2.3K citations

Juming Tang

33 papers, 1.8K citations

C. Oliver Kappe

16 papers, 2.5K citations

Stuart O. Nelson

15 papers, 398 citations

Stavros Avramidis

9 papers, 121 citations