Resources

Author(s): Aliénor Rivière, Laurent Duchemin, Christophe Josserand, and Stéphane Perrard One of the main flow geometries into which bubbles break in turbulence are uniaxial straining flows. In this work we investigate bubble deformations and breakup in these flows, as a function of the Reynolds number, the Weber number (We, ratio of inertia and capillarity) and the initial bubble shape. We demonstrate that, even though linear stability analysis...

Author(s): Gunnar G. Peng, Callum Cuttle, Christopher W. MacMinn, and Draga Pihler-Puzović Lubrication flow in a soft Hele-Shaw cell formed by the narrow gap between a rigid boundary and a confined elastic solid can choke itself: The viscous pressure gradient squeezes the soft material which bulges into the flow path near the cell outlet, ultimately interrupting the flow if the flow rate is too large. Here we show that if the lubrication flow...

Author(s): Rabia Sonmez, Robert A. Handler, Ryan Kelly, David B. Goldstein, and Saikishan Suryanarayanan We show that laminar vortex rings can be generated by impulsive body forces having particular spatial and temporal characteristics. Numerical simulations and analytical models show that the strength of these rings can be accurately predicted by considering diffusion alone, despite the nonlinear nature of the generation process. It is found...

Author(s): Christine Gilbert, John Gilbert, and M. Javad Javaherian Wedge water entry serves as a key model to understand phenomena like high-speed craft slamming, seaplane landings, and diving aquatic birds. In this paper, wedge water entry experiments and simulations are used to examine how hydrodynamic loads, structural deflection, water contact lines, and rigid body motions are influenced by changes in the flexural rigidity of the wedge’s...

Author(s): Christophe Pirat, Cécile Cottin-Bizonne, Choongyeop Lee, Stella M. M. Ramos, and Olivier Pierre-Louis Drop breakup is often associated with boiling or violent impacts onto targets. We report on experiments where the decrease of ambient pressure triggers the growth of a bubble in a drop that sits on a textured hydrophobic surface. We find a transition from top-breakup to triple-line breakup depending on the initial contact angle of the...

Author(s): Ao Xu, Ben-Rui Xu, and Heng-Dong Xi Through high-resolution pore-scale simulations, we uncover that impermeable solid porous matrices significantly influence the heat and fluid flow within these materials. We discover that as porosity decreases, temperature fluctuations increase; unlike porous materials with matrices being permeable to heat flux, impermeable ones cause less organized flow patterns. Furthermore, intense thermal energy...

Author(s): Dana Harvey and Justin C. Burton During the Leidenfrost effect, a stable vapor film separates a hot solid from an evaporating liquid. As the solid cools, the vapor layer is metastable, and can undergo a violent collapse accompanied by explosive boiling of the liquid. We provide insight into this failure mechanism using a computational model with hydrodynamics, thermodynamics, and rapid evaporation of the liquid phase. By varying both...