Development of a Microwave Irradiation Probe for a Cylindrical Applicator
| Autor: | Ryo Nakajima, Tsukasa Chikata, Takashi Watanabe, Naoki Shinohara, Nozaki Yoshihiro, Tomohiko Mitani |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Permittivity
Materials science Impedance matching Physics::Optics microwave heating Bioengineering Port (circuit theory) 02 engineering and technology Astrophysics::Cosmology and Extragalactic Astrophysics Conductivity lcsh:Chemical technology 010402 general chemistry 01 natural sciences lcsh:Chemistry chemistry.chemical_compound Optics coaxial feeding applicator design Chemical Engineering (miscellaneous) lcsh:TP1-1185 electromagnetic simulation Polytetrafluoroethylene business.industry Process Chemistry and Technology 021001 nanoscience & nanotechnology 0104 chemical sciences lcsh:QD1-999 chemistry Microwave irradiation Reflection (physics) 0210 nano-technology business Microwave |
| Zdroj: | Processes Volume 7 Issue 3 Processes, Vol 7, Iss 3, p 143 (2019) |
| ISSN: | 2227-9717 |
| DOI: | 10.3390/pr7030143 |
| Popis: | 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&mdash ultrapure water and 2 M NaOH solution&mdash 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. |
| Databáze: | OpenAIRE |
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