An experimental study of the interaction of a planar diffusion flame with a line vortex is presented. A planar diffusion flame is established between two coflowing, equal velocity streams of acetylene diluted with nitrogen and air. A line vortex is generated on demand by momentarily pulsing one of the flow streams by way of electromagnetic actuation of a piston in the flow apparatus. The flame–...

Abstract. In this paper, we study numerically quantized vortex dynamics and their interactions in the two-dimensional (2D) nonlinear Schrödinger equation (NLSE) with a dimensionless parameter ε > 0 proportional to the size of the vortex core on bounded domains under either a Dirichlet or a homogeneous Neumann boundary condition (BC). We begin with a review of the reduced dynamical laws for time...

A large body of work over the last few years [1] supports the picture of long thick vortices as the most important long range degrees of freedom for confinement. In this note we wish to examine more closely the manner in which a linear potential arises from vortex fluctuations. One customarily assumes a picture of randomly distributed vortices of certain thickness and basically arbitrary length...

Use is made of Onsager’s hydrodynamic equation to derive the vibration spectrum of the vortex lattice in d-wave superconductor. In particular the rhombic lattice (i.e. the 45 tilted square lattice) is found to be stable for B > Hcr(t). Here Hcr(t) denotes the critical field at which the vortex lattice transition takes place. Typeset using REVTEX 1 Since the discovery of the triangular vortex la...

Competition between the vortex lattice and a lattice of asymmetric artificial defects is shown to play a crucial role in ratchet experiments in superconducting films. We present a novel and collective mechanism for current reversal based on a reconfiguration of the vortex lattice. In contrast to previous models of vortex current reversal, the mechanism is based on the global response of the vor...

We study experimentally the nonlinear dynamics of two-color optical vortex beams in the presence of second-harmonic generation combined with the effects of photo- and thermal refraction, as well as self- and induced-phase modulation. We use an iron-doped lithium niobate crystal as a nonlinear medium for the vortex propagation and observe experimentally, depending on the laser wavelength, a deca...

Background Vortex formation in the left ventricle (LV) is suggested to contribute to efficient blood pumping and altered vortex formation is associated with diastolic dysfunction. Patients after atrioventricular septal defect (AVSD) correction present abnormalities in valve morphology and subsequently develop altered inflow patterns (Calkoen et al. JMRI 2014), which may disturb normal vortex fo...

We show that thermally activated interstitial and vacancy defects can lead to first-order melting of a vortex lattice. We obtain good agreement with experimentally measured melting curve, latent heat, and magnetization jumps for YBa2Cu3O72d and Bi2Sr2CaCu2O8. The shear modulus of the vortex liquid is frequency dependent and crosses over from zero at low frequencies to a finite value at high fre...

The methods of formal matched asymptotics are used to examine the motion of a curvilinear vortex in an inhomogeneous type-II superconducting material in the limit as the vortex core radius tends to zero. The resulting law of motion indicates that the logarithm of the equilibrium density of the superconducting electrons acts as a pinning potential for the vortex, so that vortices will be attract...

The three-dimensional uniformly frustrated XY model is simulated to search for a predicted ‘‘vortex loop’’ transition within the vortex line liquid phase of a strongly type-II superconductor in an applied magnetic field. Results are shown to strongly depend on the precise scheme used to trace out vortex line paths. While we find evidence for a transverse vortex path percolation transition, no s...