STUDY OF DRAG FORCE TO FALLING SPHERES IN CARRIER MATERIALS (MIXTURE OF VISCOUS FLUID AND FINE PARTICLES) FOR ORE LIFTING TECHNOLOGY AND INTERPRETATION OF RHEOLOGICAL CONSTANTS
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- ORITA Kiyotaka
- 東京海洋大学 大学院海洋科学技術研究科 海洋資源環境学専攻
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- TANI Kazuo
- 東京海洋大学 学術研究院 海洋資源エネルギー学部門
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- KOSHO Tetsushi
- (株)不動テトラ 地盤事業本部
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- SUZUKI Akihiko
- (株)不動テトラ 地盤事業本部
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- TANAKA Keiichi
- (株)不動テトラ 地盤事業本部
Bibliographic Information
- Other Title
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- 揚鉱に用いるキャリア物質(粒状体を含む粘性流動体)が球に及ぼす力の沈降実験による検討
Description
<p> To lift up coarse and heavy ores from deep seafloor, new technology by using circulating carrier materials (mixtures of viscous fluid and fine particles, CMs) in riser pipe was proposed. For effective operation, CMs must not be separated from ores during lifting. In this paper, the results of sphere falling experiments conducted to study the non-separability of ores in CMs were reported. By RFID system, falling velocities of invisible spheres, i.e. ore models (OMs), were monitored in a vertical pipe which was filled with turbid CMs. By assuming the viscous characteristics of CMs as that of Bingham fluid, the rheological properties, i.e. the plastic viscosity and the yield stress, were estimated. The obtained results demonstrated that the plastic viscosity is dependent on the mixing proportions of both thickener and fine particles while the yield stress is dependent only on the thickener. Finally, the condition of nonseparability for spherical ores of certain diameters and densities was derived based on the rheological model for CMs.</p>
Journal
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- Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)
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Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 76 (2), I_881-I_886, 2020
Japan Society of Civil Engineers
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Details 詳細情報について
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- CRID
- 1390567172577632640
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- NII Article ID
- 130007910350
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- ISSN
- 21854688
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- Text Lang
- ja
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed