81 citations · 368 across the 26 of their papers we have counts for
28 papers
Coexisting chaos and order in micro-textured elastic flows
Giulio Foggi Rota, Ricardo Arturo Lopez de la Cruz, Simon J. Haward +2
Viscoelastic fluid flows over micro-textured surfaces - densely covered by slender protrusions like cilia lining the body airways or villi covering the intestinal epithelium - unde…
Elastic wakes mediate collective viscoelastic fluid-structure interactions in side-by-side cantilever arrays
Arisa Yokokoji, Amy Q. Shen, Simon J. Haward
Fluid-structure interaction (FSI) in viscoelastic flows past deformable structures at low Reynolds numbers remains poorly understood, despite its relevance to biological systems su…
Numerical analysis of capillarity-driven thinning rheometry for polydisperse polymer solutions
Isaac Pincus, Vincenzo Calabrese, Simon J. Haward +1
Liquid bridges of polymer solutions that are self-thinning due to the action of capillarity undergo a transition from Newtonian-like linear thinning to exponential elastocapillary…
Polymer extension at stagnation points governs flow thickening of polymer solutions in ordered porous media
Emily Y. Chen, Simon J. Haward, Amy Q. Shen +1
Polymer solutions exhibit anomalous flow thickening -- marked by an abrupt increase in the macroscopic flow resistance -- above a threshold flow rate in a porous medium, but not in…
Flow-history-dependent orientational relaxation in dilute polydisperse colloidal rod suspensions
Yuto Yokoyama, Vincenzo Calabrese, Fabian Hillebrand +3
Orientation and relaxation dynamics of rod-like colloids under flow govern the optical and mechanical properties of many emerging soft materials. In polydisperse suspensions, parti…
Effects of fluid rheology and geometric disorder on the enhanced resistance of viscoelastic flows through porous media
Simon J Haward, Amy Q Shen
Recent works reveal the importance of chaotic flow fluctuations as a mechanism for the enhanced resistance observed in viscoelastic porous media flows, and also show how chaotic fl…
Colloidal rod dynamics under large amplitude oscillatory extensional flow
Steffen M. Recktenwald, Vincenzo Calabrese, Amy Q. Shen +2
We perform a combined experimental and theoretical investigation of the orientational dynamics of rod-like colloidal particles in dilute suspension as they are subjected to a time-…
Transport of spherical microparticles in a 3D vortex flow
Marine Aulnette, Noa Burshtein, Arash Alizad Banaei +5
Particles are common in biological and environmental flows and are widely used in industrial and pharmaceutical applications. Their motion and flow dynamics are strongly affected b…
Capillary-driven thinning of DNA solutions
Vincenzo Calabrese, Silvia Nardone, Amy Q. Shen +1
Capillary thinning of polymeric fluids is central to biological and industrial processes, yet the mechanisms governing thinning dynamics remain unresolved, especially for semi-flex…
Large Amplitude Oscillatory Extension (LAOE) of dilute polymer solutions
Steffen M. Recktenwald, Thomas P. John, Amy Q. Shen +3
This study presents an experimental framework for large amplitude oscillatory extension (LAOE) to investigate nonlinear material properties of complex fluids. Using a microfluidic…
Stagnation points at grain contacts generate an elastic flow instability in 3D porous media
Emily Y. Chen, Christopher A. Browne, Simon J. Haward +2
Many environmental, energy, and industrial processes involve the flow of polymer solutions in three-dimensional (3D) porous media where fluid is confined to navigate through comple…
The interplay of plasticity and elasticity in elastoviscoplastic flows in wavy channels
Mohamed S. Abdelgawad, Simon J. Haward, Amy Q. Shen +1
Elastoviscoplastic (EVP) fluids, which exhibit both solid-like and liquid-like behavior depending on the applied stress, are critical in industrial processes involving complex geom…
Effects of polydispersity and concentration on elastocapillary thinning of dilute polymer solutions
Vincenzo Calabrese, Amy Q. Shen, Simon J. Haward
The thinning of liquid bridges under capillary stress occurs in widespread processes like jetting, dripping, and spraying, and creates a strong extensional flow capable of stretchi…
From yield stress to elastic instabilities: Tuning the extensional behavior of elastoviscoplastic fluid
Mohamed S. Abdelgawad, Simon J. Haward, Amy Q. Shen +1
In this study, we delve into the intricacies of elastoviscoplastic (EVP) fluids, particularly focusing on how polymer additives influence their extensional behavior. Our findings r…
How do polymers stretch in capillary-driven extensional flows?
Vincenzo Calabrese, Amy Q. Shen, Simon J. Haward
Measurements of the capillary-driven thinning and breakup of fluid filaments are widely used to extract extensional rheological properties of complex materials. For viscoelastic (e…
Extensibility governs the flow-induced alignment of polymers and rod-like colloids
Vincenzo Calabrese, Tatiana Porto Santos, Carlos G. Lopez +3
Polymers and rod-like colloids (PaRC) adopt a favorable orientation under sufficiently strong flows. However, how the flow kinematics affect the alignment of such nanostructures ac…
Extensional rheometry of mobile fluids. Part II: Comparison between the uniaxial, planar and biaxial extensional rheology of dilute polymer solutions using numerically-optimized stagnation point microfluidic devices
Simon J. Haward, Stylianos Varchanis, Gareth H. McKinley +2
In Part I of this paper [Haward et al. submitted (2023)], we presented a new three-dimensional microfluidic device (the optimized uniaxial and biaxial extensional rheometer, OUBER)…
Extensional rheometry of mobile fluids. Part I: OUBER, an optimized uniaxial and biaxial extensional rheometer
Simon J. Haward, Francisco Pimenta, Stylianos Varchanis +4
We present a numerical optimization of a "6-arm cross-slot" device, yielding several three-dimensional shapes of fluidic channels designed to impose close approximations to ideal u…
Canopy elastic turbulence: spontaneous formation of waves in beds of slender microposts
Charlotte de Blois, Simon J. Haward, Amy Q. Shen
In a viscoelastic flow over a microfluidic canopy of polymeric pillars, we report the spontaneous emergence of waves in the form of propagating regions of low flow velocity compare…
Alignment of colloidal rods in crowded environments
Vincenzo Calabrese, Stylianos Varchanis, Simon J. Haward +1
Understanding the hydrodynamic alignment of colloidal rods in polymer solutions is pivotal for manufacturing structurally ordered materials. How polymer crowding influences the flo…
Perspectives on viscoelastic flow instabilities and elastic turbulence
Sujit S. Datta, Arezoo M. Ardekani, Paulo E. Arratia +20
Viscoelastic fluids are a common subclass of rheologically complex materials that are encountered in diverse fields from biology to polymer processing. Often the flows of viscoelas…
Stagnation points control chaotic fluctuations in viscoelastic porous media flow
Simon J. Haward, Cameron C. Hopkins, Amy Q. Shen
Viscoelastic flows through porous media become unstable and chaotic beyond critical flow conditions, impacting industrial and biological processes. Recently, Walkama \textit{et al.…
Microtomographic PIV measurements of viscoelastic instabilities in a 3D micro-contraction
Daniel W. Carlson, Amy Q. Shen, Simon J. Haward
Viscoelastic flow through an abrupt planar contraction geometry above a certain Weissenberg number (Wi) is well known to become unstable upstream of the contraction plane via a cen…
Tristability in viscoelastic flow past side-by-side microcylinders
Cameron C. Hopkins, Simon J. Haward, Amy Q. Shen
Viscoelastic flows through microscale porous arrays exhibit complex path-selection and switching phenomena. However, understanding this process is limited by a lack of studies link…