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强化传热期刊
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ISSN 打印: 1065-5131
ISSN 在线: 1026-5511

强化传热期刊

DOI: 10.1615/JEnhHeatTransf.v10.i1.70
pages 81-93

Effects of a Droplet on Near-Wall Transport Phenomena in Turbulent Downward Liquid-Liquid Flow

Yoshimichi Hagiwara
Department of Mechanical and System Engineering, Graduate School of Science and Technology, Kyoto Institute of Technology Goshokaido-cho, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
Satoshi Takagaki
Department of Mechanical and System Engineering, Kyoto Institute of Technology, Goshokaido-cho, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
Takuji Yuge
Department of Mechanical and System Engineering, Kyoto Institute of Technology, Goshokaido-cho, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan

ABSTRACT

We conducted a visualization measurement for isothermal turbulent water downward flow with rising droplets. Wobbling motion is observed for the droplets near the duct wall. The droplet wake flow with the asymmetric evolution of vortices modifies the near-wall turbulence: the lift-up of low-speed fluid is not observed clearly near the droplet. We also carried out a direct numerical simulation for non-isothermal turbulent downward flow in a vertical channel with an immiscible droplet whose density is lower than that of the flowing fluid and found that low-temperature fluid is pushed into the buffer region by the wallward flow along the cap of the droplet. The outward flow in the droplet wake causes the liftup of the hot fluid adjacent to the wall. These flows enhance the near-wall heat transfer.


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