POF: Viscous and Non-Newtonian Flows http://scitation.aip.org/ POF: Viscous and Non-Newtonian Flows Nonlinear viscous fluid patterns in a thin rotating spherical domain and applications http://link.aip.org/link/?PHF/23/123102/1&agg=rss Ranis N. Ibragimov<br/> We study the nonlinear incompressible fluid flows within a thin rotating spherical shell. The model uses the two-dimensional Navier-Stokes equations on a rotating three-dimensional spherical surface and serves as a simple mathematical descriptor of a general atmospheric circulation caused by the dif ... [Phys. Fluids 23, 123102 (2011)] published Fri Dec 9, 2011. Dynamic evolution of fingering patterns in a lifted HeleShaw cell http://link.aip.org/link/?PHF/23/123101/1&agg=rss Julia Nase, Didi Derks, and Anke Lindner<br/> We present a study on pattern formation in a Newtonian liquid during lifting of a circular HeleShaw cell. When a confined layer of oil is subject to such a stretch flow, air penetrates into the liquid from the sides and a fingering instability, a variant of the classical SaffmanTaylor instability, e ... [Phys. Fluids 23, 123101 (2011)] published Wed Dec 7, 2011. Secondary breakup of coal water slurry drops http://link.aip.org/link/?PHF/23/113101/1&agg=rss Hui Zhao, Hai-Feng Liu, Jian-Liang Xu, and Wei-Feng Li<br/> To investigate secondary atomization of coal water slurry (CWS), deformation and breakup of eight kinds of CWS drops are presented using high speed digital camera. Based on morphology, deformation and breakup regimes of CWS drops can be termed some different modes: deformation, multimode breakup (in ... [Phys. Fluids 23, 113101 (2011)] published Wed Nov 16, 2011. Hydrodynamic dispersion in open cell polymer foam http://link.aip.org/link/?PHF/23/093105/1&agg=rss Tyler R. Brosten, Sarah L. Codd, Robert S. Maier, and Joseph D. Seymour<br/> Nuclear magnetic resonance experiments and pore-scale lattice-Boltzmann simulation in conjunction with random-walk particle-tracking are used to probe molecular displacement statistics over a range of time and lengths within several open-cell polymer foams. Short-time molecular displacement dynamics ... [Phys. Fluids 23, 093105 (2011)] published Thu Sep 29, 2011. Relaxation of internal temperature and volume viscosity http://link.aip.org/link/?PHF/23/093104/1&agg=rss Domenico Bruno and Vincent Giovangigli<br/> We investigate the relaxation of internal temperature and the concept of volume viscosity in nonequilibrium gas models derived from the kinetic theory. We first investigate a nonequilibrium gas model with two temperaturestranslational and internalwhere the volume viscosity is absent. We establish th ... [Phys. Fluids 23, 093104 (2011)] published Wed Sep 28, 2011. Regularized shock solutions in coating flows with small surface tension http://link.aip.org/link/?PHF/23/093103/1&agg=rss D. Badali, M. Chugunova, D. E. Pelinovsky, and S. Pollack<br/> We study the dynamics of thin liquid films on the surface of a rotating horizontal cylinder in the presence of gravity in the small surface tension limit. Using dynamical system methods, we show that the continuum of shock solutions increasing across the jump point persists in the small surface tens ... [Phys. Fluids 23, 093103 (2011)] published Tue Sep 20, 2011. The effects of inhomogeneous boundary dilution on the coating flow of an anti-HIV microbicide vehicle http://link.aip.org/link/?PHF/23/093101/1&agg=rss Savas Tasoglu, Jennifer J. Peters, Su Chan Park, Stephane Verguet, David F. Katz et al.<br/> A recent study in South Africa has confirmed, for the first time, that a vaginal gel formulation of the antiretroviral drug Tenofovir, when topically applied, significantly inhibits sexual HIV transmission to women [Karim et al., Science 329, 1168 (2010)]. However, the gel for this drug and anti-HIV ... [Phys. Fluids 23, 093101 (2011)] published Thu Sep 15, 2011. Effect of axial and transverse magnetic fields on the flow behavior of ferrofluids featuring different levels of interparticle interaction http://link.aip.org/link/?PHF/23/093102/1&agg=rss M. Reindl and S. Odenbach<br/> A study is conducted on the influence of magnetic fields on the flow behavior of two ferrofluids with different levels of interparticle interaction, determined by prior rheological measurements. A Taylor-Couette system is used as a model for the investigations. A homogeneous magnetic field is applie ... [Phys. Fluids 23, 093102 (2011)] published Thu Sep 15, 2011. Wang's shrinking cylinder problem with suction near a stagnation point http://link.aip.org/link/?PHF/23/083102/1&agg=rss Y. Y. Lok and I. Pop<br/> In this paper, the steady axisymmetric stagnation point flow of a viscous and incompressible fluid over a shrinking circular cylinder with mass transfer (suction) is studied. The flow is induced by a cylinder shrinking with a linear velocity distribution from the stagnation line. The fluid flow solu ... [Phys. Fluids 23, 083102 (2011)] published Tue Aug 16, 2011. Perturbation solution for the viscoelastic 3D flow around a rigid sphere subject to simple shear http://link.aip.org/link/?PHF/23/083101/1&agg=rss Kostas D. Housiadas and Roger I. Tanner<br/> We study the steady, three-dimensional creeping, and viscoelastic flow around a freely rotating rigid sphere subject to simple shear flow imposed at infinity. The viscoelasticity of the ambient fluid is modeled using the second-order-fluid model, the Upper Convected Maxwell, the exponential affine P ... [Phys. Fluids 23, 083101 (2011)] published Mon Aug 1, 2011. Controllable adhesion using field-activated fluids http://link.aip.org/link/?PHF/23/073104/1&agg=rss Randy H. Ewoldt, Piotr Tourkine, Gareth H. McKinley, and A. E. Hosoi<br/> We demonstrate that field-responsive magnetorheological fluids can be used for variable-strength controllable adhesion. The adhesive performance is measured experimentally in tensile tests (a.k.a. probe-tack experiments) in which the magnetic field is provided by a cylindrical permanent magnet. Incr ... [Phys. Fluids 23, 073104 (2011)] published Thu Jul 28, 2011. On the stationary macroscopic inertial effects for one phase flow in ordered and disordered porous media http://link.aip.org/link/?PHF/23/073103/1&agg=rss D. Lasseux, A. A. Abbasian Arani, and A. Ahmadi<br/> We report on the controversial dependence of the inertial correction to Darcy's law upon the filtration velocity (or Reynolds number) for one-phase Newtonian incompressible flow in model porous media. Our analysis is performed on the basis of an upscaled form of the Navier-Stokes equation requiring ... [Phys. Fluids 23, 073103 (2011)] published Wed Jul 27, 2011. Electrohydrodynamic quenching in polymer melt electrospinning http://link.aip.org/link/?PHF/23/073102/1&agg=rss Eduard Zhmayev, Daehwan Cho, and Yong Lak Joo<br/> Infrared thermal measurements on polymer melt jets in electrospinning have revealed rapid quenching by ambient air, an order of magnitude faster than predicted by the classical Kase and Matsuo correlation. This drastic heat transfer enhancement can be linked to electrohydrodynamic (EHD) effects. Ana ... [Phys. Fluids 23, 073102 (2011)] published Tue Jul 26, 2011. The influence of pressure relaxation on the structure of an axial vortex http://link.aip.org/link/?PHF/23/073101/1&agg=rss Robert L. Ash, Irfan Zardadkhan, and Allan J. Zuckerwar<br/> Governing equations including the effects of pressure relaxation have been utilized to study an incompressible, steady-state viscous axial vortex with specified far-field circulation. When sound generation is attributed to a velocity gradient tensor-pressure gradient product, the modified conservati ... [Phys. Fluids 23, 073101 (2011)] published Tue Jul 26, 2011. Thin viscous sheets with inhomogeneous viscosity http://link.aip.org/link/?PHF/23/063103/1&agg=rss G. Pfingstag, B. Audoly, and A. Boudaoud<br/> We derive the equations governing the dynamics of thin viscous sheets having non-homogeneous viscosity, via asymptotic expansion methods. We consider distributions of viscosity that are inhomogeneous in the longitudinal and transverse directions and arbitrary (bulk and surface) external forces. Two ... [Phys. Fluids 23, 063103 (2011)] published Tue Jun 28, 2011. A theoretical bridge between linear and nonlinear microrheology http://link.aip.org/link/?PHF/23/063102/1&agg=rss Ryan J. DePuit, Aditya S. Khair, and Todd M. Squires<br/> Passive microrheology exploits the fluctuation-dissipation theorem to relate thermal fluctuations of a colloidal probe to the near-equilibrium linear response behavior of the material through an assumed generalized Stokes Einstein relation (GSER). Active and nonlinear microrheology, on the other han ... [Phys. Fluids 23, 063102 (2011)] published Fri Jun 24, 2011. Shear flow over a porous layer: Velocity in the real proximity of the interface via rheological tests http://link.aip.org/link/?PHF/23/063101/1&agg=rss Claudia Carotenuto and Mario Minale<br/> In this paper, we have experimentally investigated the velocity profile of a fluid undergoing simple shear above a porous medium. To this end, we used for the first time rheological tests performed with a constant stress rheometer equipped with parallel plate geometry with a real porous medium glued ... [Phys. Fluids 23, 063101 (2011)] published Thu Jun 23, 2011. Viscous fingering of a miscible reactive A+B-->C interface for an infinitely fast chemical reaction: Nonlinear simulations http://link.aip.org/link/?PHF/23/043103/1&agg=rss Y. Nagatsu and A. De Wit<br/> Nonlinear dynamics of miscible viscous fingering is analyzed numerically for a reactive system when a solution containing a reactant A is displacing another miscible solution containing another reactant B. A simple A+B-->C reaction takes place upon contact of the solutions. The viscosity of the flui ... [Phys. Fluids 23, 043103 (2011)] published Mon Apr 18, 2011. Modeling and simulations of the spreading and destabilization of nematic droplets http://link.aip.org/link/?PHF/23/043102/1&agg=rss L. J. Cummings, T.-S. Lin, and L. Kondic<br/> A series of experiments [C. Poulard and A. M. Cazabat, Spontaneous spreading of nematic liquid crystals, Langmuir 21, 6270 (2005)] on spreading droplets of nematic liquid crystal (NLC) reveals a surprisingly rich variety of behaviors. Small droplets can either be arrested in their spreading, spread ... [Phys. Fluids 23, 043102 (2011)] published Mon Apr 18, 2011. Short-time pressure response during the start-up of a constant-rate production of a high pressure gas well http://link.aip.org/link/?PHF/23/043101/1&agg=rss Yan Jin, Kang Ping Chen, Mian Chen, Nicholas Grapsas, and Fu Xiang Zhang<br/> The start-up flow of a constant-rate production of a high pressure gas well is studied, with emphasis on the effect of gas acceleration. Gas acceleration is important in the near wellbore region for a high pressure gas in a high permeability formation. It is shown that when gas acceleration is impor ... [Phys. Fluids 23, 043101 (2011)] published Mon Apr 11, 2011. Role of fluid elasticity on the dynamics of rinsing flow by an impinging jet http://link.aip.org/link/?PHF/23/033101/1&agg=rss Tienyi T. Hsu, Travis W. Walker, Curtis W. Frank, and Gerald G. Fuller<br/> Rinsing flows are common processes where a jet of one liquid impinges upon a layer of a second liquid for the purpose of removing the second liquid. An imaging setup has been developed to obtain both qualitative and quantitative data on the rinsing flow of a jet of water impinging on either layers o ... [Phys. Fluids 23, 033101 (2011)] published Wed Mar 16, 2011.