Resources

Author(s): Douglas H. Kelley Discoveries of the last decade increasingly support the idea that by flowing through and around the brain, cerebrospinal fluid and other water-like fluids constitute a distinct transport system, important for removing metabolic waste from the brain and relevant to brain injuries. This paper reviews one team’s recent studies of brain cerebrospinal fluid flow. We consider the characteristics of flows and the spaces through...

Author(s): Jiayu Li and Harishankar Manikantan Complex surfactant-laden interfaces exhibit surface rheological stresses when deforming against themselves, which in turn affects the flow and stability of the adjacent bulk fluids. We investigate, for the first time, the impact of interfacial rheology on the Saffman-Taylor or viscous fingering problem and demonstrate the stabilizing role of surface viscosity. We show that surface viscosity slows...

Author(s): M. Borgnino, G. Boffetta, and S. Musacchio The effect of geometrical confinement on Rayleigh-Taylor mixing in porous media is investigated by means of numerical simulations. We find a dimensional transition from three-dimensional to two-dimensional phenomenology when the density plumes become larger than the confining scale. In the two-dimensional regime we observe a faster mixing process and a larger value of the density Nusselt number...

Author(s): Alexander W. Wray, Patrick S. Wray, Brian R. Duffy, and Stephen K. Wilson Evaporating sessile droplets interact with neighboring droplets via their vapor fields, resulting in nonaxisymmetric evaporative fluxes from their surfaces. One of the consequences of this asymmetry is that, unlike the uniform deposits left at the contact lines of isolated droplets, the deposits left at the contact lines of droplets with neighbors are, in general...

Author(s): Wei Zhao, Weidong Su, and Guiren Wang We investigated the high intermittency of electrokinetic turbulence with experiments and the She-Leveque model. The intermittency factor 𝛽 can be larger than 1 in electrokinetic turbulence. 𝛽 > 1 indicates that the probability of velocity structures on small scales are determined by all the probabilities of velocity structures on large scales. The investigation finds a route to turbulence through...

Author(s): Jun Hu A three-dimensional unstable oscillatory instability is found for a downward flow of liquid metal in a vertical duct under strong wall heating and a transverse magnetic field. The unstable oscillatory mode first occurs at the specific flow structure which has an upward reverse flow near the heating wall and a downward flow near the opposite wall. The existence of an inflection point is the key instability mechanism of the three...

Author(s): Frank G. Jacobitz and Kai Schneider The Lagrangian and Eulerian acceleration (LA and EA) properties of fluid particles in homogeneous turbulence with uniform shear and uniform stable stratification are studied with direct numerical simulations. A wavelet-based scale-dependent decomposition of LA and EA is performed. Joint probability density functions of LA and EA show a trend of stronger correlation with increasing stratification strength...