TY - JOUR
T1 - Sterilization efficacy of a coaxial microwave plasma flow at atmospheric pressure
AU - Sato, Takehiko
AU - Fujioka, Kazunari
AU - Ramasamy, Raju
AU - Urayama, Takuya
AU - Fujii, Shuitsu
N1 - Funding Information:
Paper MSDAD-05-42, presented at the 2004 Industry Applications Society Annual Meeting, Seattle, WA, October 3–7, and approved for publication in the IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS by the Electrostatic Processes Committee of the IEEE Industry Applications Society. Manuscript submitted for review October 15, 2004 and released for publication December 28, 2005. This work was supported in part by the Institute of Fluid Science, in part by Tohoku University, and in part by the 21st COE program “International COE of Flow Dynamics” of Tohoku University.
PY - 2006/3
Y1 - 2006/3
N2 - A coaxial cable for microwave transmission type of atmospheric low-temperature plasma source was developed. The plasma source has the advantages of portability, simple configuration, and ability to operate with a wide range of gases and mixtures of such gases. It mainly consists of a cavity, a quartz discharge tube, a coaxial cable, a microwave power source, and a gas supply system. Using this plasma source, the authors tried to clarify its sterilization efficacy against Geobacillus stearothermophilus. A log reduction number of G. stearothermophilus of at least 5 (10-5) was obtained under the following operating conditions: gas flow rate of argon of 14 SL/min, input power is 400 W, and substrate surface temperature of 353 K. Distributions of temperature and velocities of gas were also measured two-dimensionally by using an E-type thermocouple and a Pitot tube, respectively. The temperature distributions and the peak value of temperature were found to be influenced by the gas flow rate and the kinds of gas mixtures.
AB - A coaxial cable for microwave transmission type of atmospheric low-temperature plasma source was developed. The plasma source has the advantages of portability, simple configuration, and ability to operate with a wide range of gases and mixtures of such gases. It mainly consists of a cavity, a quartz discharge tube, a coaxial cable, a microwave power source, and a gas supply system. Using this plasma source, the authors tried to clarify its sterilization efficacy against Geobacillus stearothermophilus. A log reduction number of G. stearothermophilus of at least 5 (10-5) was obtained under the following operating conditions: gas flow rate of argon of 14 SL/min, input power is 400 W, and substrate surface temperature of 353 K. Distributions of temperature and velocities of gas were also measured two-dimensionally by using an E-type thermocouple and a Pitot tube, respectively. The temperature distributions and the peak value of temperature were found to be influenced by the gas flow rate and the kinds of gas mixtures.
KW - Argon
KW - Atmospheric pressure
KW - Coaxial microwave plasma
KW - Geobacilllus stearothermophilus
KW - Sterilization
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U2 - 10.1109/TIA.2006.870039
DO - 10.1109/TIA.2006.870039
M3 - Article
AN - SCOPUS:33645315529
VL - 42
SP - 399
EP - 404
JO - IEEE Transactions on Applications and Industry
JF - IEEE Transactions on Applications and Industry
SN - 0093-9994
IS - 2
ER -