Investigation of temperature characteristics of multiphase AC arc by high-speed visualization
The objective of the present study is to understand fluctuation phenomena in a multiphase AC arc as a heat source for material processing based on the high-speed visualization technique of the temperature field. The multiphase AC arc is one of the most attractive thermal plasmas which possess extrem...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
The Japan Society of Mechanical Engineers
2017-12-01
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| Series: | Journal of Fluid Science and Technology |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jfst/12/3/12_2017jfst0024/_pdf/-char/en |
| _version_ | 1798020960318652416 |
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| author | Manabu TANAKA Tomoyuki IMATSUJI Taro HASHIZUME Takayuki WATANABE Hisao NAGAI Takeshi KOIWASAKI Takafumi OKUMA |
| author_facet | Manabu TANAKA Tomoyuki IMATSUJI Taro HASHIZUME Takayuki WATANABE Hisao NAGAI Takeshi KOIWASAKI Takafumi OKUMA |
| author_sort | Manabu TANAKA |
| collection | DOAJ |
| description | The objective of the present study is to understand fluctuation phenomena in a multiphase AC arc as a heat source for material processing based on the high-speed visualization technique of the temperature field. The multiphase AC arc is one of the most attractive thermal plasmas which possess extremely high temperature, high chemical reactivity, rapid quenching capability, and selectivity of the reaction atmosphere in accordance with required chemical reaction. In particular, the multiphase AC arc has a strong advantage on higher energy efficiency compared with other thermal plasmas. Therefore, this heat source has been applied to innovative material processing such as in-flight glass melting. However, the temporal and spatial characteristics of the multiphase AC arc have not been clarified although these are essential to control the characteristics of the products such as particle size distribution, yields of the desired materials. The high-speed visualization of the temperature field of the multiphase AC arc was conducted at 1x104 fps as typical framerate to observe the dynamic behavior of the multiphase AC arc in millisecond time scale. An optical system including the band-pass filters was combined with the high-speed camera to observe particular line emissions from atomic argon with negligible emissions from thermal plasma. The obtained experimental results indicated that the temperature of the multiphase AC arc was around 1.0x104 K. The arc temperature fluctuated in the range from 0.6x104 to 1.3x104 K. Consequently, the arc temperature in the multiphase AC arc is sufficiently high to treat the refractory metals and/or ceramics powders. Furthermore, the obtained temperature was well-validated by the conventional spectroscopic method with high accuracy. |
| first_indexed | 2024-04-11T17:06:11Z |
| format | Article |
| id | doaj.art-bd34d8767ab944be800dabe95cea0885 |
| institution | Directory Open Access Journal |
| issn | 1880-5558 |
| language | English |
| last_indexed | 2024-04-11T17:06:11Z |
| publishDate | 2017-12-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Journal of Fluid Science and Technology |
| spelling | doaj.art-bd34d8767ab944be800dabe95cea08852022-12-22T04:13:01ZengThe Japan Society of Mechanical EngineersJournal of Fluid Science and Technology1880-55582017-12-01123JFST0024JFST002410.1299/jfst.2017jfst0024jfstInvestigation of temperature characteristics of multiphase AC arc by high-speed visualizationManabu TANAKA0Tomoyuki IMATSUJI1Taro HASHIZUME2Takayuki WATANABE3Hisao NAGAI4Takeshi KOIWASAKI5Takafumi OKUMA6Department of Chemical Engineering, Kyushu UniversityDepartment of Chemical Engineering, Kyushu UniversityDepartment of Chemical Engineering, Kyushu UniversityDepartment of Chemical Engineering, Kyushu UniversityPanasonic Corp.Panasonic Corp.Panasonic Corp.The objective of the present study is to understand fluctuation phenomena in a multiphase AC arc as a heat source for material processing based on the high-speed visualization technique of the temperature field. The multiphase AC arc is one of the most attractive thermal plasmas which possess extremely high temperature, high chemical reactivity, rapid quenching capability, and selectivity of the reaction atmosphere in accordance with required chemical reaction. In particular, the multiphase AC arc has a strong advantage on higher energy efficiency compared with other thermal plasmas. Therefore, this heat source has been applied to innovative material processing such as in-flight glass melting. However, the temporal and spatial characteristics of the multiphase AC arc have not been clarified although these are essential to control the characteristics of the products such as particle size distribution, yields of the desired materials. The high-speed visualization of the temperature field of the multiphase AC arc was conducted at 1x104 fps as typical framerate to observe the dynamic behavior of the multiphase AC arc in millisecond time scale. An optical system including the band-pass filters was combined with the high-speed camera to observe particular line emissions from atomic argon with negligible emissions from thermal plasma. The obtained experimental results indicated that the temperature of the multiphase AC arc was around 1.0x104 K. The arc temperature fluctuated in the range from 0.6x104 to 1.3x104 K. Consequently, the arc temperature in the multiphase AC arc is sufficiently high to treat the refractory metals and/or ceramics powders. Furthermore, the obtained temperature was well-validated by the conventional spectroscopic method with high accuracy.https://www.jstage.jst.go.jp/article/jfst/12/3/12_2017jfst0024/_pdf/-char/enthermal plasmahigh-speed imagingtemperature measurementarc fluctuation |
| spellingShingle | Manabu TANAKA Tomoyuki IMATSUJI Taro HASHIZUME Takayuki WATANABE Hisao NAGAI Takeshi KOIWASAKI Takafumi OKUMA Investigation of temperature characteristics of multiphase AC arc by high-speed visualization Journal of Fluid Science and Technology thermal plasma high-speed imaging temperature measurement arc fluctuation |
| title | Investigation of temperature characteristics of multiphase AC arc by high-speed visualization |
| title_full | Investigation of temperature characteristics of multiphase AC arc by high-speed visualization |
| title_fullStr | Investigation of temperature characteristics of multiphase AC arc by high-speed visualization |
| title_full_unstemmed | Investigation of temperature characteristics of multiphase AC arc by high-speed visualization |
| title_short | Investigation of temperature characteristics of multiphase AC arc by high-speed visualization |
| title_sort | investigation of temperature characteristics of multiphase ac arc by high speed visualization |
| topic | thermal plasma high-speed imaging temperature measurement arc fluctuation |
| url | https://www.jstage.jst.go.jp/article/jfst/12/3/12_2017jfst0024/_pdf/-char/en |
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