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ISSN Druckformat: 1065-5131
ISSN Online: 1563-5074
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Effects of a Droplet on Near-Wall Transport Phenomena in Turbulent Downward Liquid-Liquid Flow
ABSTRAKT
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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Goldstein R.J., Ibele W.E., Patankar S.V., Simon T.W., Kuehn T.H., Strykowski P.J., Tamma K.K., Heberlein J.V.R., Davidson J.H., Bischof J., Kulacki F.A., Kortshagen U., Garrick S., Srinivasan V., Heat transfer—A review of 2003 literature, International Journal of Heat and Mass Transfer, 49, 3-4, 2006. Crossref
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Goto Masashi, Matsukura Noriyuki, Hagiwara Yoshimichi, Heat transfer characteristics of warm water flow with cool immiscible droplets in a vertical pipe, Experimental Thermal and Fluid Science, 29, 3, 2005. Crossref
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Yuge Takuji, Hagiwara Yoshimichi, The modifications of near-wall turbulence structure and heat transfer by immiscible droplets in turbulent liquid–liquid two-phase flow, International Journal of Heat and Fluid Flow, 25, 3, 2004. Crossref
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Kouda Takuro, Hagiwara Yoshimichi, An experimental study on turbulent swirling water flow with immiscible droplets, International Journal of Heat and Fluid Flow, 27, 4, 2006. Crossref