Resources

Author(s): SungGyu Chun, Evgeniy Boyko, Ivan C. Christov, and Jie Feng The flow rate–pressure drop relations for laminar flow of Newtonian fluids in common geometries are well understood. However, a complete understanding of how the interplay between shear-thinning rheology and wall compliance sets the flow rate–pressure drop relation for a deformable configuration is still lacking. Here, we provide detailed quantitative comparisons between theory...

Author(s): Neeraj S. Borker, Abraham D. Stroock, and Donald L. Koch A self-aligning particle (SAP) attains near perfect alignment with the fluid lamellae of a low Reynolds number simple shear flow without application of external torques in contrast with the continuous rotation exhibited by most rigid bodies including thin fibers and disks. We characterize the robustness of the flow alignment of SAPs to secondary perturbations such as flow disturbances...

Author(s): E. Dormy and H. K. Moffatt Stokes flow driven by rotation of two parallel cylinders inside a cylinder of large radius R0 is investigated, and the flow in this triply-connected domain is determined numerically, with particular focus on the narrow-gap situation, when the local behavior is well described by lubrication theory. The asymptotic situation for infinite R0 is inferred (i) when the cylinder axes are unconstrained, and (ii) when...

Author(s): Nan He, Yutong Cui, David Wai Quan Chin, Thierry Darnige, Philippe Claudin, and Benoît Semin We report experiments on the dissolution of a single particle during its sedimentation in a quiescent aqueous solution in the regime of low Reynolds and high Péclet numbers. We use butyramide, a chemical which does not change the density of water when it dissolves. The particle shrinks at a rate independent of its initial radius, in agreement...

Author(s): Alexis Commereuc, Sandrine Mariot, Emmanuelle Rio, and François Boulogne The structure of liquid foams follows simple geometric rules formulated by Plateau 150 years ago. On smooth surfaces, the foam liquid channels, also called pseudo Plateau borders, are straight between vertices. We demonstrate experimentally that on rough surfaces and under some conditions that we establish, the bubble footprint exhibits a morphological transition...

Author(s): Rebecca Liyanage, Xiaojing Fu, Ronny Pini, and Ruben Juanes We examine how fluids mix in three-dimensional (3D) porous materials due to differences in density which represent one mechanism of underground carbon dioxide storage. The experiment closely matched the simulation in terms of the patterns and speed of mixing. Interestingly, the experiment reveals columnar plumes self-organizing into a reticular pattern, previously seen only...

Author(s): G. Corsi, P. G. Ledda, G. Vagnoli, F. Gallaire, and A. De Simone Seed dispersal strategies exemplify the role of morphology in defining falling paths. Here, macroscopic geometry effects are systematically studied by considering trajectories of annular disks. Via linear stability analysis, we identify the stability boundary for vertical fall, with a non-monotonic behavior of the critical falling velocity with the hole size, before increasing...