Visualization and Measurement of Swirling Flow of Dry Ice Particles in Cyclone Separator-Sublimator

Haruhiko Yamasaki, Hiroyuki Wakimoto, Takeshi Kamimura, Kazuhiro Hattori, Petter Nekså and Hiroshi Yamaguchi
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Haruhiko Yamasaki: Department of Mechanical Engineering, Osaka Prefecture University, 1-1 Gakuen-Cho, Naka-ku, Sakai 599-8531, Japan
Hiroyuki Wakimoto: Department of Mechanical Engineering, Osaka Prefecture University, 1-1 Gakuen-Cho, Naka-ku, Sakai 599-8531, Japan
Takeshi Kamimura: Mayekawa MFG. Co., Ltd., 3-14-15 Botan, Koto-ku, Tokyo 135-8482, Japan
Kazuhiro Hattori: Mayekawa MFG. Co., Ltd., 3-14-15 Botan, Koto-ku, Tokyo 135-8482, Japan
Petter Nekså: SINTEF Energy Research, Sem Sælands vei 11, 7034 Trondheim, Norway
Hiroshi Yamaguchi: Department of Mechanical Engineering, Doshisha University, Kyotanabe city, Kyoto 610-0321, Japan

Energies, 2022, vol. 15, issue 11, 1-17

Abstract: The dry ice sublimation process of carbon dioxide (CO 2 ) is a unique, environmentally friendly technology that can achieve a temperature of −56 °C or lower, which is a triple point of CO 2 in CO 2 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 2 gas flow is dominant in the circumferential velocity of dry ice particles.

Keywords: dry ice; carbon dioxide; cyclone separator-sublimator; swirling flow; visualization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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