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Friction-drag reduction effect in wall turbulence with fluorescently-labeled polymer

DOI: 10.1615/ICHMT.2015.THMT-15.1640
pages 735-738

T. Atsumi
Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakamachi, Koganei-shi, Tokyo 184-8588, Japan

Hiroya Mamori
Department of Mechanical Engineering, Keio University, Hiyoshi 3-14-1, Kohoku-ku, Yokohama 223-8522,Japan; Department of Mechanical Systems Engineering Tokyo University of Agriculture and Technology 2-24-16 Koganei City Naka Town Tokyo; Tokyo University of Science,6-3-1 Niijuku, Katsushika-ku, Tokyo, 125-8585, Japan

Kaoru Iwamoto
Department of Mechanical Engineering, Tokyo University of Science, Noda-shi, Chiba 278-8510; Department of Mechanical System Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan

Akira Murata
Tokyo University of Agriculture and Technology

H. Ando
National Maritime Research Institute, 6-38-1 Shinkawa, Mitaka, Tokyo 181-0004, Japan

M. Masuda
National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8568, Japan

M. Wada
National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8568, Japan

Résumé

Skin-friction drag reduction effect by polymer additives in a turbulent channel flow is investigated by means of PIV and LIF measurement. We employed a fluorescentl labeled polymer in order to capture the polymer behavior in the flow. As a preliminary experiment, the fluorescentl labeled polymer is visualized in the rotating flow and compared with the dyed polymer. The fluorescentl labeled polymer shows to form a thread-like structure for longer time than the dyed polymer. The PIV measurement of the turbulent channel flow with the dyed polymer shows the decrease of the Reynolds shear stress, which implies the skin-friction drag reduction.

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