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• W3200389952 abstract "• Previous approaches for deriving a log law in bubbly flows are reviewed. • Different theoretical reasons are given that the log-law can fail for wall-bounded bubbly flows. • Evidence from DNS are shown to support the theoretical reasons. There has been considerable discussion in recent years concerning whether a log-law exists for wall-bounded, turbulent bubbly flows. Previous studies have argued for the existence of such a log-law, with a modified von Kármán constant, and this is used in various modelling studies. We provide a critique of this idea, and present several theoretical reasons why a log-law need not be expected in general for wall-bounded, turbulent bubbly flows. We then demonstrate using recent data from interface-resolving Direct Numerical Simulations that when the bubbles make a significant contribution to the channel flow dynamics, the mean flow profile of the fluid can deviate significantly from the log-law behaviour that approximately holds for the single-phase case. The departures are not surprising and the basic reason for them is simple, namely that for bubbly flows, the mean flow is affected by a number of additional dynamical parameters, such as the void fraction, that do not play a role for the single-phase case. As a result, the inner/outer asymptotic regimes that form the basis of the derivation of the log-law for single-phase flow do not exist in general for bubbly turbulent flows. Nevertheless, we do find that for some cases, the bubbles do not cause significant departures from the unladen log-law behaviour. Moreover, we show that if departures occur these cannot be understood simply in terms of the averaged void fraction, but that more subtle effects such as the bubble Reynolds number and the competition between the wall-induced turbulence and the bubble-induced turbulence must play a role." @default.
• W3200389952 created "2021-09-27" @default.
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• W3200389952 date "2021-10-01" @default.
• W3200389952 modified "2023-09-24" @default.
• W3200389952 title "Assessment of the validity of a log-law for wall-bounded turbulent bubbly flows" @default.
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• W3200389952 doi "https://doi.org/10.1016/j.ijheatfluidflow.2021.108857" @default.
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