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[21-10-4-08] Sphere pull-up tests to assess drag force on ore model and influence of the pipe wall on drag force in riser pipe

*CHOI HONGSEOK¹, Kazuo Tani², Shun Nomusra³, Akihiko Suzuki⁵, Hiroshi Yabe⁴, Hiroaki Umeda⁶ (1. Tokyo Univercity of Marine Science and Technology, 2. Tokyo Univercity of Marine Science and Technology, 3. Tokyo Univercity of Marine Science and Technology, 4. Fudo Tetra, 5. Fudo Tetra, 6. Fudo Tetra)

Keywords:Drag force, ore lifting, deep sea mining