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Relaminarization of Turbulent Pipe Flow due to Traveling Wavy Blowing and Suction Control

DOI: 10.1615/THMT-18.330
pages 353-358

S. Koganezawa
Department of Mechanical Systems Engineering, Tokyo Univercity of Agriculture and Technology, 2-24-16 Nakamachi, Koganei-shi, Tokyo 184-8588, 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
Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, 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


Relaminarization phenomenon in turbulent pipe flows by traveling wavy blowing and suction control is investigated by means of direct numerical simulations. A range of the relaminarization phenomenon is investigated: the amplitude of the wave is a/uz,lam > 0.05, the wavelength is 150 < λ+ < 500, and the wavespeed is c/uz,lam > 1.5, where uz,lam is the mean bulk velocity of the corresponding laminar flow. A pathline analysis shows that all the injected particles from the blowing part of the traveling wave return toward wall in the relaminarization case. We suggest therefore that the flow induced by the traveling wave significantly contributes to the relaminarization phenomenon.

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