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Processes 2019, 7(3), 143;

Development of a Microwave Irradiation Probe for a Cylindrical Applicator

Research Institute for Sustainable Humanosphere, Kyoto University, Kyoto 611-0011, Japan
Japan Chemical Engineering & Machinery Co. Ltd., Osaka 532-0031, Japan
Author to whom correspondence should be addressed.
Received: 25 January 2019 / Revised: 21 February 2019 / Accepted: 5 March 2019 / Published: 7 March 2019
(This article belongs to the Special Issue Microwave Applications in Chemical Engineering)
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A microwave irradiation probe was newly developed for downsizing microwave applicators and the overall microwave heating apparatus. The key component of the proposed probe is a tapered section composed of polytetrafluoroethylene (PTFE) and alumina. Insertion of the tapered section between the input port and the applicator vessel realizes impedance matching to the microwave power source and reduces the reflected power from the applicator. The proposed microwave probe for a cylindrical applicator was designed using 3D electromagnetic simulations. The permittivity data of two liquid samples—ultrapure water and 2 M NaOH solution—were measured and taken into simulations. The conductivity of the NaOH solution was estimated from the measurement results. The measured reflection ratio of the fabricated applicator was in good accordance with the simulated one. The frequency ranges in which the measured reflection ratio was less than 10% were from 1.45 GHz to 2.7 GHz when using water and from 1.6 GHz to 2.7 GHz when using the NaOH solution as the sample. The heating rate of the applicator was roughly estimated as 63 to 69 K for a 5 min interval during the 2.45 GHz microwave irradiation at the input power of 100 W. View Full-Text
Keywords: microwave heating; applicator design; electromagnetic simulation; coaxial feeding microwave heating; applicator design; electromagnetic simulation; coaxial feeding

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Mitani, T.; Nakajima, R.; Shinohara, N.; Nozaki, Y.; Chikata, T.; Watanabe, T. Development of a Microwave Irradiation Probe for a Cylindrical Applicator. Processes 2019, 7, 143.

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