Jason S. Wexler
Princeton University
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Featured researches published by Jason S. Wexler.
Applied Physics Letters | 2011
Scott S. H. Tsai; Jason S. Wexler; Jiandi Wan; Howard A. Stone
We present a co-flow microfluidic method to coat paramagnetic beads with a thin layer of fluid as the beads are pulled across a liquid-liquid interface by an external magnetic field. We show that the coating thickness can be controlled by the magnitude of the flow speed. Also, the number of beads aggregated within a single coating can be adjusted by varying the strength of the magnetic field or the liquid-liquid interfacial tension.
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Science | 2015
Ching Yao Lai; Zhong Zheng; Emilie Dressaire; Jason S. Wexler; Howard A. Stone
When a pressurized fluid is injected into an elastic matrix, the fluid generates a fracture that grows along a plane and forms a fluid-filled disc-like shape. We report a laboratory study of such a fluid-driven crack in a gelatin matrix, study the crack shape as a function of time and investigate the influence of different experimental parameters such as the injection flow rate, Young’s modulus of the matrix and fluid viscosity. We choose parameters so that effects of material toughness are small. We find that the crack radius R(t) increases with time t according to tα with α=0.48±0.04. The rescaled experimental data at long times for different parameters collapse based on scaling arguments, available in the literature, showing R(t)∝t4/9 from a balance of viscous stresses from flow along the crack and elastic stresses in the surrounding matrix. Also, we measure the time evolution of the crack shape, which has not been studied before. The rescaled crack shapes collapse at longer times and show good agreement with the scaling arguments. The gelatin system provides a useful laboratory model for further studies of fluid-driven cracks, which has important applications such as hydraulic fracturing.
Physics of Fluids | 2015
Ian Jacobi; Jason S. Wexler; Howard A. Stone
Liquid-infused patterned surfaces offer a promising new platform for generating omniphobic surface coatings. However, the liquid infused in these surfaces is susceptible to shear-driven dewetting. Recent work [Wexler et al., “Shear-driven failure of liquid-infused surfaces,” Phys. Rev. Lett. 114, 168301 (2015)] has shown how the substrate pattern in these surfaces can be designed to exploit capillary forces in order to retain infused lubricants against the action of an immiscible shear flow. In this study, we explore the behavior of the infused lubricant when external shear causes the lubricant to overflow finite or “dead-end” surface features, resulting in either temporary or permanent lubricant loss. Microfluidic experiments illustrate how both geometry and chemical Marangoni stresses within liquid-infused surfaces generate an overflow cascade in which the lubricant escapes from the substrate and forms droplets on the surface, after which the droplets depin and are washed away by the external shear flow...
arXiv: Soft Condensed Matter | 2016
Carlos E. Colosqui; Jason S. Wexler; Ying Liu; Howard A. Stone
The shear-driven drainage of capillary grooves filled with viscous liquid is a dynamic wetting phenomenon relevant to numerous industrial processes and novel lubricant-infused surfaces. Prior work has reported that a finite length
Physics of Fluids | 2015
Ian Jacobi; Jason S. Wexler; Mohamed A. Samaha; Jessica Shang; Brian Rosenberg; Marcus Hultmark; Howard A. Stone
L_\infty
Volume 6: Fluids and Thermal Systems; Advances for Process Industries, Parts A and B | 2011
Scott S. H. Tsai; Jason S. Wexler; Ian Griffiths; Howard A. Stone
of the capillary groove can remain indefinitely filled with liquid even when large shear stresses are applied. The mechanism preventing full drainage is attributed to a balance between the shear-driven flow and a counterflow driven by capillary pressures caused by deformation of the free surface. The final equilibrium length
Physical Review Letters | 2015
Jason S. Wexler; Ian Jacobi; Howard A. Stone
L_\infty
Soft Matter | 2015
Jason S. Wexler; Abigail K. Grosskopf; Melissa Chow; Yuyang Fan; Ian Jacobi; Howard A. Stone
is uniquely determined by physical properties of the filling liquid as well as the geometry and wettability of the capillary. In this work, we examine closely the approach to the final equilibrium length
Lab on a Chip | 2013
Scott S. H. Tsai; Jason S. Wexler; Jiandi Wan; Howard A. Stone
L_\infty
Journal of Fluid Mechanics | 2013
Jason S. Wexler; Philippe H. Trinh; Helene Berthet; Nawal Quennouz; Olivia du Roure; Herbert E. Huppert; Anke Lindner; Howard A. Stone
and report a crossover to a slow drainage regime that cannot be described by conventional dynamic models considering solely hydrodynamic and capillary forces. The slow drainage regime observed in experiments can be instead modeled by a kinetic equation describing a sequence of random thermally activated transitions between multiple metastable states caused by surface defects with nanoscale dimensions. Our findings provide new insights on the critical role that natural or engineered surface roughness with nanoscale dimensions can play in the imbibition and drainage of capillaries and other dynamic wetting processes in microscale systems.