Drop Breakup and Intermittent Turbulence
Jerzy Bałdyga,John R. Bourne +1 more
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In this paper, the fine structure of turbulent flow is applied to drop breakup in the inertial sub-range, and a multifractal method describes intermittency and the distribution of velocity fluctuations etc.Abstract:
Recent studies on the fine structure of turbulent flow are applied to drop breakup in the inertial sub-range. A multifractal method describes intermittency and the distribution of velocity fluctuations etc. For a given drop size and a given time-averaged energy dissipation rate, a wide range of stresses acts to cause breakup. These stresses and their relative frequencies are calculated. The most likely exponent on the Weber Number is close to –0.6. Smaller values (possibly as low as –0.93) arise from rare, but violent intermittent turbulence. Such low exponents are likely after long agitation times and for small tanks.read more
Citations
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Mixing and the Selectivity of Chemical Reactions
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The effect of agitation intensity on alkali-catalyzed methanolysis of sunflower oil.
TL;DR: The sunflower oil methanolysis was studied in a stirred reactor at different agitation speeds and the Sauter-mean drop diameter stays constant in the initial slow reaction region, rapidly decreases during the fast reaction period and finally reaches the equilibrium level.
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Drop break‐up in intermittent turbulence: Maximum stable and transient sizes of drops
Jerzy Bałdyga,Wioletta Podgórska +1 more
TL;DR: In this paper, a multifractal method describing the fine-scale structure of turbulence, including its intermittency, is applied to derive the drop breakage functions for drops whose diameter falls within the inertial subrange of turbulence.
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Drop break-up in turbulent pipe flow downstream of a restriction
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Effects of agitation and scale-up on drop size in turbulent dispersions: allowance for intermittency
TL;DR: In this paper, drop size correlations have been explored using equations for stable drop size and drop break-up in intermittent turbulence, the latter being modelled by a multifractal spectrum, which is then successfully applied to new drop size measurements for two geometrically similar stirred tanks having different scales.
References
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Journal ArticleDOI
A simple dynamical model of intermittent fully developed turbulence
TL;DR: In this paper, the authors present a phenomenological model of intermittency called the P-model and related to the Novikov-Stewart (1964) model, which is dynamical in the sense that they work entirely with inertial-range quantities such as velocity amplitudes, eddy turnover times and energy transfer.
Journal ArticleDOI
The multifractal nature of turbulent energy dissipation
TL;DR: In this article, the intermittency of the rate of turbulent energy dissipation e is investigated experimentally, with special emphasis on its scale-similar facets, using a general formulation in terms of multifractals, and interpreting measurements in that light.
Journal ArticleDOI
The multifractal spectrum of the dissipation field in turbulent flows
TL;DR: In this paper, the authors make a connection between the multifractal approach (described in section 2) and the traditional language used in the turbulence literature, and use it to measure the (infinite) set of generalized dimensions of the turbulent energy dissipation field.
Journal ArticleDOI
Drop breakup in turbulent stirred‐tank contactors. Part II: Relative influence of viscosity and interfacial tension
C.Y. Wang,Richard V. Calabrese +1 more
TL;DR: In this article, the relative influence of dispersed-phase viscosity and interfacial tension on equilibrium drop size and drop size distribution is studied for dilute suspensions by dispersing various silicone oils in water, methanol, and their solutions.
Journal ArticleDOI
Scale effect on breakup process in liquid-liquid agitated tanks
TL;DR: In this article, the authors investigated the effect of scale on the breakup process in liquid-liquid agitated tanks and found that breakups occurred not only in the isotropic turbulent region but also in the nonisotropic turbulent region.