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Turbulent mass transfer in a drag-reducing channel flow with dosed polymer solution by simultaneous PIV and PLIF measurements

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.2630
pages 2535-2546

Masaaki Motozawa
Department of Mechanical Engineering Tokyo University of Science 2641 Yamazaki, Noda-shi, Chiba-ken, Japan

T. Otsuki
Department of Mechanical Engineering, Tokyo University of Science; Department of Mechanical Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka, Japan

Takafumi Kurosawa
Department of Mechanical Engineering, Tokyo University of Science, 2641 Yamazaki, Noda 278-8510, 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

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

T. Senda
National Maritime Research Institute, Shinkawa, Mitaka-shi, Tokyo 181-0004, Japan

Yasuo Kawaguchi
Department of Mechanical Engineering, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 278-8510, Japan

Abstract

Turbulent mass transfer in a drag-reducing channel flow by dosed polymer solution was investigated experimentally by simultaneous PIV and PLIF measurements. To discuss the relationship between mass transfer and momentum transportation, turbulent Schmidt number was computed. Reynolds number based on the channel height was set to 40000 and poly(ethylene oxide) was used as a polymer. The polymer solution with 25 and 100 ppm of weight concentration was dosed at 10.5 L/min from the whole surface of the channel wall. As a result, in the case of water flow, dosed dyed water was ejected from the wall and was well diffused by the strong turbulent eddy motion. In contrast, when the polymer solution was dosed from the wall, the diffusion was largely suppressed in the near-wall region and drag reduction occurred. The turbulent Schmidt number largely increases over 1 in the near-wall region.

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