516 citations · 1.2k across the 15 of their papers we have counts for
15 papers
On the breakup frequency of bubbles and droplets in turbulence: a compilation and evaluation of experimental data
Shijie Zhong, Rui Ni
The dispersed phase in liquid-liquid emulsions and air-liquid mixtures can often be fragmented into smaller sizes by the surrounding turbulent carrier phase. The critical parameter…
Deformation and breakup of bubbles and drops in turbulence
Rui Ni
Fragmentation of bubbles and droplets in turbulence produces a dispersed phase spanning a broad range of scales, encompassing everything from droplets in nanoemulsions to centimete…
Folding dynamics and its intermittency in turbulence
Yinghe Qi, Charles Meneveau, Greg Voth +1
Fluid elements deform in turbulence by stretching and folding. In this work, by projecting the material deformation tensor onto the largest stretching direction, the dynamics of fo…
Fragmentation in turbulence by small eddies
Yinghe Qi, Shiyong Tan, Noah Corbitt +3
From air-sea gas exchange, oil pollution, to bioreactors, the ubiquitous fragmentation of bubbles/drops in turbulence has been modelled by relying on the classical Kolmogorov-Hinze…
Simultaneous measurements of deforming Hinze-scale bubbles with surrounding turbulence
Ashik Ullah Mohammad Masuk, Ashwanth K. R. Salibindla, Rui Ni
We experimentally investigate the breakup mechanisms and probability of Hinze-scale bubbles in turbulence. The Hinze scale is defined as the critical bubble size based on the criti…
The Flow Physics of COVID-19
Rajat Mittal, Rui Ni, Jung-Hee Seo
Flow physics plays a key role in nearly every facet of the COVID-19 pandemic. This includes the generation and aerosolization of virus-laden respiratory droplets from a host, its a…
Passive directors in turbulence
L. Zhao, K. Gustavsson, R. Ni +4
In experiments and numerical simulations we measured angles between the symmetry axes of small spheroids advected in turbulence ("passive directors"). Since turbulent strains tend…
Effects of polymer additives in the bulk of turbulent thermal convection
Yi-Chao Xie, Shi-Di Huang, Denis Funfschilling +3
We present experimental evidence that a minute amount of polymer additives can significantly enhance heat transport in the bulk region of turbulent thermal convection. The effects…
Long-range Acoustic Interactions in Insect Swarms: An Adaptive Gravity Model
Dan Gorbonos, Reuven Ianconescu, James G. Puckett +3
The collective motion of groups of animals emerges from the net effect of the interactions between individual members of the group. In many cases, such as birds, fish, or ungulates…
Measurements of the coupling between the tumbling of rods and the velocity gradient tensor in turbulence
Rui Ni, Stefan Kramel, Nicholas T. Ouellette +1
We present simultaneous experimental measurements of the dynamics of anisotropic particles transported by a turbulent flow and the velocity gradient tensor of the flow surrounding…
Measurements of the Solid-body Rotation of Anisotropic Particles in 3D Turbulence
Guy G. Marcus, Shima Parsa, Stefan Kramel +2
We introduce a new method to measure Lagrangian vorticity and the rotational dynamics of anisotropic particles in a turbulent fluid flow. We use 3D printing technology to fabricate…
Alignment of vorticity and rods with Lagrangian fluid stretching in turbulence
Rui Ni, Nicholas T. Ouellette, Greg A. Voth
Stretching in continuum mechanics is naturally described using the Cauchy-Green strain tensors. These tensors quantify the Lagrangian stretching experienced by a material element,…
On the Kolmogorov Constants for the Second-Order Structure Function and the Energy Spectrum
Rui Ni, Ke-Qing Xia
We examine the behavior of the Kolmogorov constants C_2, C_k, and C_{k1}, which are, respectively, the prefactors of the second order longitudinal structure function, the three dim…
Experimental investigation of pair dispersion with small initial separation in convective turbulent flows
Rui Ni, Ke-Qing Xia
We report an experimental investigation of pair dispersions in turbulent thermal convection with initial separation r0 ranging from sub-Kolmogorov scale to scales in the inertial r…
Flow reversals in thermally driven turbulence
Kazuyasu Sugiyama, Rui Ni, Richard J. A. M. Stevens +7
We analyze the reversals of the large scale flow in Rayleigh-Bénard convection both through particle image velocimetry flow visualization and direct numerical simulations (DNS) of…