Visualization and Measurement of Swirling Flow of Dry Ice Particles in Cyclone Separator-Sublimator
The dry ice sublimation process of carbon dioxide (CO<sub>2</sub>) is a unique, environmentally friendly technology that can achieve a temperature of −56 °C or lower, which is a triple point of CO<sub>2</sub> in CO<sub>2</sub> refrigeration systems. In this study,...
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MDPI AG
2022-06-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/15/11/4128 |
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| author | Haruhiko Yamasaki Hiroyuki Wakimoto Takeshi Kamimura Kazuhiro Hattori Petter Nekså Hiroshi Yamaguchi |
| author_facet | Haruhiko Yamasaki Hiroyuki Wakimoto Takeshi Kamimura Kazuhiro Hattori Petter Nekså Hiroshi Yamaguchi |
| author_sort | Haruhiko Yamasaki |
| collection | DOAJ |
| description | The dry ice sublimation process of carbon dioxide (CO<sub>2</sub>) is a unique, environmentally friendly technology that can achieve a temperature of −56 °C or lower, which is a triple point of CO<sub>2</sub> in CO<sub>2</sub> refrigeration systems. In this study, a cyclone separator-evaporator was proposed to separate dry ice particles in an evaporator. As an initial step before introducing the cyclone separator-evaporator into an actual refrigeration system, a prototype cyclone separator-evaporator was constructed to visualize dry ice particles in a separation chamber. A high-speed camera was used to visualize the non-uniform flow of dry ice particles that repeatedly coalescence and collision in a swirl section. Consequently, the dry ice particle size and the circumferential and axial velocities of dry ice were measured. The results show that the equivalent diameter of the most abundant dry ice particles in the cyclone separation chamber is 2.0 mm. As the inner diameter of the separation section decreases, dry ice particles coalesce and grow from an equivalent diameter of 4 mm to a maximum of 40 mm. In addition, the comparison of the experimental and simulation results shows that the drag force due to CO<sub>2</sub> gas flow is dominant in the circumferential velocity of dry ice particles. |
| first_indexed | 2024-03-10T01:19:58Z |
| format | Article |
| id | doaj.art-5b8c2cafa6d44065b1f0dcf1f009fd06 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T01:19:58Z |
| publishDate | 2022-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-5b8c2cafa6d44065b1f0dcf1f009fd062023-11-23T14:00:49ZengMDPI AGEnergies1996-10732022-06-011511412810.3390/en15114128Visualization and Measurement of Swirling Flow of Dry Ice Particles in Cyclone Separator-SublimatorHaruhiko Yamasaki0Hiroyuki Wakimoto1Takeshi Kamimura2Kazuhiro Hattori3Petter Nekså4Hiroshi Yamaguchi5Department of Mechanical Engineering, Osaka Prefecture University, 1-1 Gakuen-Cho, Naka-ku, Sakai 599-8531, JapanDepartment of Mechanical Engineering, Osaka Prefecture University, 1-1 Gakuen-Cho, Naka-ku, Sakai 599-8531, JapanMayekawa MFG. Co., Ltd., 3-14-15 Botan, Koto-ku, Tokyo 135-8482, JapanMayekawa MFG. Co., Ltd., 3-14-15 Botan, Koto-ku, Tokyo 135-8482, JapanSINTEF Energy Research, Sem Sælands vei 11, 7034 Trondheim, NorwayDepartment of Mechanical Engineering, Doshisha University, Kyotanabe city, Kyoto 610-0321, JapanThe dry ice sublimation process of carbon dioxide (CO<sub>2</sub>) is a unique, environmentally friendly technology that can achieve a temperature of −56 °C or lower, which is a triple point of CO<sub>2</sub> in CO<sub>2</sub> refrigeration systems. In this study, a cyclone separator-evaporator was proposed to separate dry ice particles in an evaporator. As an initial step before introducing the cyclone separator-evaporator into an actual refrigeration system, a prototype cyclone separator-evaporator was constructed to visualize dry ice particles in a separation chamber. A high-speed camera was used to visualize the non-uniform flow of dry ice particles that repeatedly coalescence and collision in a swirl section. Consequently, the dry ice particle size and the circumferential and axial velocities of dry ice were measured. The results show that the equivalent diameter of the most abundant dry ice particles in the cyclone separation chamber is 2.0 mm. As the inner diameter of the separation section decreases, dry ice particles coalesce and grow from an equivalent diameter of 4 mm to a maximum of 40 mm. In addition, the comparison of the experimental and simulation results shows that the drag force due to CO<sub>2</sub> gas flow is dominant in the circumferential velocity of dry ice particles.https://www.mdpi.com/1996-1073/15/11/4128dry icecarbon dioxidecyclone separator-sublimatorswirling flowvisualization |
| spellingShingle | Haruhiko Yamasaki Hiroyuki Wakimoto Takeshi Kamimura Kazuhiro Hattori Petter Nekså Hiroshi Yamaguchi Visualization and Measurement of Swirling Flow of Dry Ice Particles in Cyclone Separator-Sublimator Energies dry ice carbon dioxide cyclone separator-sublimator swirling flow visualization |
| title | Visualization and Measurement of Swirling Flow of Dry Ice Particles in Cyclone Separator-Sublimator |
| title_full | Visualization and Measurement of Swirling Flow of Dry Ice Particles in Cyclone Separator-Sublimator |
| title_fullStr | Visualization and Measurement of Swirling Flow of Dry Ice Particles in Cyclone Separator-Sublimator |
| title_full_unstemmed | Visualization and Measurement of Swirling Flow of Dry Ice Particles in Cyclone Separator-Sublimator |
| title_short | Visualization and Measurement of Swirling Flow of Dry Ice Particles in Cyclone Separator-Sublimator |
| title_sort | visualization and measurement of swirling flow of dry ice particles in cyclone separator sublimator |
| topic | dry ice carbon dioxide cyclone separator-sublimator swirling flow visualization |
| url | https://www.mdpi.com/1996-1073/15/11/4128 |
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