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• W2227656877 abstract "Physics of development of flow structures around the drop rising with solute transfer is highly influenced by the interfacial behaviour and is remarkably different than a particle rising under the same conditions. We report on the use of simultaneous particle image velocimetry-planar laser induced fluorescence technique to measure scalar and velocity fields around a drop rising in a quiescent liquid channel. The selected continuous phase is glycerol, and the drop consists of a mixture of toluene, acetone, and a dye rhodamine-6G, with acetone working as a interfacial tension depressant. The drop lies in the spherical region with Eötvös number, Eo = 1.95, Morton number, M = 78.20 and the particle Reynolds number being, Rep = 0.053. With Rep approaching that of creeping flow, we analyse the effect of interfacial instabilities solely, contrary to other investigations [M. Wegener et al., “Impact of Marangoni instabilities on the fluid dynamic behaviour of organic droplets,” Int. J. Heat Mass Transfer 52, 2543-2551 (2009); S. Burghoff and E. Y. Kenig, “A CFD model for mass transfer and interfacial phenomena on single droplets,” AIChE J. 52, 4071-4078 (2006); J. Wang et al., “Numerical simulation of the Marangoni effect on transient mass transfer from single moving deformable drops,” AIChE J. 57, 2670-2683 (2011); R. F. Engberg, M. Wegener, and E. Y. Kenig, “The impact of Marangoni convection on fluid dynamics and mass transfer at deformable single rising droplets—A numerical study,” Chem. Eng. Sci. 116, 208-222 (2014)] which account for turbulence as well as interfacial instabilities with Rep in the turbulent range. The velocity and concentration fields obtained are subjected to scale-wise energy decomposition using continuous wavelet transform. Scale-wise probability distribution functions of wavelet coefficients are calculated to check intermittent non-Gaussian behaviour for simultaneous velocity and scalar statistics. Multi-fractal singularity spectra for scalar and velocity fields are calculated using wavelet transform modulus maxima methodology to analyse the distribution of non-Gaussian flow structures and their effect on scalar transport. Further, Fourier spectra based on velocity and concentration are also reported. We found that vorticity and concentration fields became progressively non-Gaussian, as one moved from large scales to small scales. This turbulence like behaviour is attributed to interfacial instabilities developed because of the non-uniform shear at the interface. The multi-fractal singularity spectra had their Hurst exponent H &gt; 0.5, which showed high correlation in the hierarchy of the flow structures. A strong correlation between concentration and velocity multi-fractal spectra was also seen." @default.
• W2227656877 created "2016-06-24" @default.
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• W2227656877 date "2015-11-01" @default.
• W2227656877 modified "2023-09-26" @default.
• W2227656877 title "Effect of solute transfer and interfacial instabilities on scalar and velocity field around a drop rising in quiescent liquid channel" @default.
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• W2227656877 doi "https://doi.org/10.1063/1.4935231" @default.
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