POF: Micro- and Nanofluid Mechanics http://scitation.aip.org/ POF: Micro- and Nanofluid Mechanics Velocity slip coefficients based on the hard-sphere Boltzmann equation http://link.aip.org/link/?PHF/24/022001/1&agg=rss Livio Gibelli<br/> We present a kinetic theory derivation of higher-order slip boundary conditions. The situation studied is that of a pressure driven isothermal gas flowing through a plane microchannel. The distribution function is expanded in terms of half-range Hermite polynomials and the system of moment equations ... [Phys. Fluids 24, 022001 (2012)] published Fri Feb 3, 2012. Dipolophoresis of dielectric spheroids under asymmetric fields http://link.aip.org/link/?PHF/24/012004/1&agg=rss Itzchak Frankel, Gilad Yossifon, and Touvia Miloh<br/> Non-spherical particles are common in colloidal science. Spheroidal shapes are particularly convenient for the analysis of the pertinent electrostatic and hydrodynamic problems and are thus widely used to model the manipulation of biological cells as well as deformed drops and bubbles. We study the ... [Phys. Fluids 24, 012004 (2012)] published Tue Jan 31, 2012. Direct simulation Monte Carlo-based expressions for the gas mass flow rate and pressure profile in a microscale tube http://link.aip.org/link/?PHF/24/012005/1&agg=rss M. A. Gallis and J. R. Torczynski<br/> The direct simulation Monte Carlo (DSMC) method of Bird is used to develop simple closed-form expressions for the mass flow rate and the pressure profile for the steady isothermal flow of an ideal gas through a microscale tube connecting two infinite reservoirs at different pressures but at the temp ... [Phys. Fluids 24, 012005 (2012)] published Tue Jan 31, 2012. Numerical demonstration of the reciprocity among elemental relaxation and driven-flow problems for a rarefied gas in a channel http://link.aip.org/link/?PHF/24/012003/1&agg=rss Shigeru Takata and Masashi Oishi<br/> Relaxations from a uniform mass/heat flow and flows driven by an external force/temperature-gradient for a rarefied gas between two parallel plates are studied on the basis of the kinetic theory of gases. By numerical computations of the linearized BhatnagarGrossKrook model of the Boltzmann equation ... [Phys. Fluids 24, 012003 (2012)] published Thu Jan 26, 2012. Multiscale modeling of particle in suspension with smoothed dissipative particle dynamics http://link.aip.org/link/?PHF/24/012002/1&agg=rss Xin Bian, Sergey Litvinov, Rui Qian, Marco Ellero, and Nikolaus A. Adams<br/> We apply smoothed dissipative particle dynamics (SDPD) [Espanol and Revenga, Phys. Rev. E 67, 026705 (2003)] to model solid particles in suspension. SDPD is a thermodynamically consistent version of smoothed particle hydrodynamics (SPH) and can be interpreted as a multiscale particle framework linki ... [Phys. Fluids 24, 012002 (2012)] published Thu Jan 19, 2012. Scaling laws for slippage on superhydrophobic fractal surfaces http://link.aip.org/link/?PHF/24/012001/1&agg=rss C. Cottin-Bizonne, C. Barentin, and L. Bocquet<br/> We study the slippage on hierarchical fractal superhydrophobic surfaces and find an unexpected rich behavior for hydrodynamic friction on these surfaces. We develop a scaling law approach for the effective slip length, which is validated by numerical resolution of the hydrodynamic equations. Our res ... [Phys. Fluids 24, 012001 (2012)] published Thu Jan 12, 2012. Dipolophoresis of interacting conducting nano-particles of finite electric double layer thickness http://link.aip.org/link/?PHF/23/122002/1&agg=rss Touvia Miloh<br/> A general integral method is presented for calculating the dipolophoretic velocities of two interacting, ideally polarizable colloids of arbitrary electric double layer thickness under weak AC electric forcing. The 12 non-linear mobilities are comprised of induced-charge-electrophoresis (ICEP), diel ... [Phys. Fluids 23, 122002 (2011)] published Fri Dec 30, 2011. Interaction of a liquid flow around a micropillar with a gas jet http://link.aip.org/link/?PHF/23/122001/1&agg=rss D. Elcock, J. Jung, C.-J. Kuo, M. Amitay, and Y. Peles<br/> An experimental study was conducted to investigate two-phase flow characteristics resulting from gas jet injection into a 225 [mu]m high by 1500 [mu]m wide microchannel. The jet was injected from a 25 [mu]m wide slit on the downstream side of a 150 [mu]m diameter pillar. The liquid Reynolds number ( ... [Phys. Fluids 23, 122001 (2011)] published Fri Dec 9, 2011. Production of monodisperse submicron drops of dielectric liquids by charge-injection from highly conducting liquids http://link.aip.org/link/?PHF/23/102003/1&agg=rss Carlos Larriba and Juan Fernandez de la Mora<br/> When ions or electrons are injected into an insulating liquid, they migrate towards its free surface, destabilize it, and form a charged jet. The jet then breaks into uniform drops charged at an approximately constant fraction of the Rayleigh limit, which relates the drop diameter D to the flow rate ... [Phys. Fluids 23, 102003 (2011)] published Wed Oct 19, 2011. Curvature-induced secondary microflow motion in steady electro-osmotic transport with hydrodynamic slippage effect http://link.aip.org/link/?PHF/23/102004/1&agg=rss Jin-Myoung Lim and Myung-Suk Chun<br/> In order to exactly understand the curvature-induced secondary flow motion, the steady electro-osmotic flow (EOF) is investigated by applying the full Poisson-Boltzmann/Navier-Stokes equations in a whole domain of the rectangular microchannel. The momentum equation is solved with the continuity equa ... [Phys. Fluids 23, 102004 (2011)] published Wed Oct 19, 2011. Electrokinetic flows through a parallel-plate channel with slipping stripes on walls http://link.aip.org/link/?PHF/23/102002/1&agg=rss Chiu-On Ng and Henry C. W. Chu<br/> Longitudinal and transverse electrohydrodynamic flows through a plane channel, of which the walls are micropatterned with a periodic array of stripes, are considered. One unit of wall pattern consists of a slipping stripe and a non-slipping stripe, each with a distinct zeta potential. The problems a ... [Phys. Fluids 23, 102002 (2011)] published Fri Oct 14, 2011. Alternating current electroosmotic flow of the Jeffreys fluids through a slit microchannel http://link.aip.org/link/?PHF/23/102001/1&agg=rss Quansheng Liu, Yongjun Jian, and Liangui Yang<br/> Using the method of separation of variables, semi-analytical solutions are presented for the time periodic EOF flow of linear viscoelastic fluids between micro-parallel plates. The linear viscoelastic fluids used here are described by the Jeffreys model. The solution involves solving the Poisson-Bol ... [Phys. Fluids 23, 102001 (2011)] published Thu Oct 13, 2011. Ferrohydrodynamic pumping of a ferrofluid or electrohydrodynamic pumping of a polar liquid through a circular tube http://link.aip.org/link/?PHF/23/092002/1&agg=rss B. U. Felderhof<br/> Ferrohydrodynamic pumping of a ferrofluid through a circular tube by means of a running magnetic wave is studied in the framework of magnetostatics. The theory for electrohydrodynamic pumping of a polar liquid by means of a running electric wave is shown to be nearly identical. For given fluid param ... [Phys. Fluids 23, 092002 (2011)] published Fri Sep 16, 2011. Efficiency of magnetic plane wave pumping of a ferrofluid through a planar duct http://link.aip.org/link/?PHF/23/092003/1&agg=rss B. U. Felderhof<br/> The efficiency of ferrohydrodynamic pumping of a ferrofluid through a planar duct by means of a running magnetic plane wave is studied to second order in the amplitude of the exciting current density. The rate of dissipation in the fluid is calculated from the first order magnetic field and magnetiz ... [Phys. Fluids 23, 092003 (2011)] published Fri Sep 16, 2011. Microbubble formation and pinch-off scaling exponent in flow-focusing devices http://link.aip.org/link/?PHF/23/092001/1&agg=rss Wim van Hoeve, Benjamin Dollet, Michel Versluis, and Detlef Lohse<br/> We investigate the gas jet breakup and the resulting microbubble formation in a microfluidic flow-focusing device using ultra high-speed imaging at 1 x 10 frames/s. In recent experiments [Dollet et al., Phys. Rev. Lett. 100, 034504 (2008)], it was found that in the final stage of the collapse the ... [Phys. Fluids 23, 092001 (2011)] published Thu Sep 15, 2011. Optimizing mixing in lid-driven flow designs through predictions from Eulerian indicators http://link.aip.org/link/?PHF/23/082005/1&agg=rss Kevin L. McIlhany, David Mott, Elaine Oran, and Stephen Wiggins<br/> In this paper, we further develop the notion of Eulerian indicators (EIs) for predicting Lagrangian mixing behavior. We employ a two-dimensional blinking Stokes flow as a model for mixing in a three-dimensional, spatially periodic channel flow. Each blinking flow alternates two distinct velocity fie ... [Phys. Fluids 23, 082005 (2011)] published Fri Aug 19, 2011. Combined influence of streaming potential and substrate compliance on load capacity of a planar slider bearing http://link.aip.org/link/?PHF/23/082004/1&agg=rss Jeevanjyoti Chakraborty and Suman Chakraborty<br/> In the present study, we investigate the combined interplay of streaming potential and substrate compliance with sliding dynamics on the load carrying capacity of a planar slider bearing. We relax previously utilized simplifying assumptions to model the electrokinetic effects and demonstrate that th ... [Phys. Fluids 23, 082004 (2011)] published Thu Aug 18, 2011. An integral perturbation model of flow and momentum transport in rotating microchannels with smooth or microstructured wall surfaces http://link.aip.org/link/?PHF/23/082003/1&agg=rss Vince D. Romanin and Van P. Carey<br/> This paper summarizes the development of an integral perturbation solution of the equations governing flow momentum transport and energy conversion in microchannels between disks of multiple-disk drag turbines such as Tesla turbines. Analysis of this type of flow problem is a key element in optimal ... [Phys. Fluids 23, 082003 (2011)] published Wed Aug 17, 2011. Self-similar analysis of fluid flow and heat-mass transfer of nanofluids in boundary layer http://link.aip.org/link/?PHF/23/082002/1&agg=rss A. A. Avramenko, D. G. Blinov, and I. V. Shevchuk<br/> Processes of heat, momentum, and concentration transport in a boundary layer of a nanofluid near a flat wall were studied. The study was performed by means of numerical analysis of boundary layer equations in a self-similar form. Self-similar forms of these equations were obtained based on symmetry ... [Phys. Fluids 23, 082002 (2011)] published Thu Aug 11, 2011. Ferrofluid flow in the annular gap of a multipole rotating magnetic field http://link.aip.org/link/?PHF/23/082001/1&agg=rss Isaac Torres-Diaz and Carlos Rinaldi<br/> A solution is obtained for the ferrohydrodynamic problem of ferrofluid flow in the annular gap between two coaxial cylinders under the influence of the magnetic field generated by a multipole stator winding. The solution is applicable to small values of the applied magnetic field amplitude, takes in ... [Phys. Fluids 23, 082001 (2011)] published Thu Aug 4, 2011. Numerical study of the formation process of ferrofluid droplets http://link.aip.org/link/?PHF/23/072008/1&agg=rss Jing Liu, Yit Fatt Yap, and Nam-Trung Nguyen<br/> This paper numerically investigates the influence of a uniform magnetic field on the droplet formation process at a microfluidic flow focusing configuration. The mathematical model was formulated by considering the balance of forces such as interfacial tension, magnetic force, and viscous stress acr ... [Phys. Fluids 23, 072008 (2011)] published Wed Jul 27, 2011.