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Author(s): Hiufai Yik, Valentina Valori, and Stephan Weiss Thermal convection experiments with strongly varying fluid properties, when the Oberbeck-Boussinesq (OB) condition is violated, are presented. By using compressed sulfur hexafluoride above its critical point, measurements with different degrees of fluid property variations are conducted, while keeping the Rayleigh and Prandtl number fixed. The vertical heat transport is significantly enhanced...

Author(s): T. Traverso and S. Michelin In suspensions of self-propelled Janus phoretic colloids, chemically mediated interactions generate spontaneous collective dynamics. A kinetic model of such dilute phoretic suspensions demonstrates how these phenomena may be promoted, hindered, or even suppressed by the particles’ self-propulsion velocity, depending on their detailed surface properties. The long-term dynamics are characterized by the competition...

Author(s): You-sheng Zhang, Wei-dan Ni, Yu-cang Ruan, and Han-song Xie A systematic model is established to quantitatively predict the evolution of Rayleigh-Taylor turbulence at three different mixing levels and density ratios. Our predictions show great correspondence with the previous experiments and simulations and make an appropriate explanation for the distinct differences existing in experiments. [Phys. Rev. Fluids 5, 104501] Published...

Author(s): M. Jotkar, L. Rongy, and A. De Wit Convective dissolution, relevant to CO2 geological sequestration, occurs when a given species dissolves in a host phase and increases density. Chemical reactions have been shown to enhance this convection. If the chemical species involved diffuse at different rates, an additional convection zone due to double-diffusion processes can develop below the reaction front in addition to the dissolution-driven...

Author(s): Wouter J. T. Bos The origin of nonclassical behavior in grid turbulence is traced back to the mean flow induced by the wakes of the grid bars. A simple model captures and explains the main nonequilibrium features of the flow. [Phys. Rev. Fluids 5, 104607] Published Mon Oct 19, 2020

Author(s): Weiqi Huang and Xinping Zhou An experimental study of the supercooling solidification of an axisymmetric vertical liquid bridge under the influence of gravity is carried out. An ice ring is formed at the end of the freezing process because of the instability of the liquid bridge. A model considering gravity and the supercooling effect is developed to describe the freezing of liquid bridge. [Phys. Rev. Fluids 5, 103601] Published...

Author(s): Juan Carlos Fernández-Toledano, Terence D. Blake, Joël De Coninck, and Matej Kanduč Large-scale molecular dynamic simulations are used to investigate the velocity dependence of the dynamic contact angle of a waterlike liquid on a flat carbonlike solid surface and to extract the coefficients of contact-line friction. It is shown that the same coefficients are obtained from a Langevin model of contact-line fluctuations at equilibrium...