A method is described for measuring the local drag coefficient on a long cylinder which exhibits vortex-induced vibration (VIV). Results are shown from a field experiment in which a long flexible pipe was instrumented with two-hundred and eighty fiber optic strain gauges. The measured local drag coefficients are compared to a commonly used drag coefficient prediction formula. The formula is sho...

In this paper, effects of EHD actuators on hydrodynamic behavior and heat transfer of air flow over a circular cylinder were considered. Pressure and temperature distributions around the cylinder were measured in presence of wire-plate EHD actuators. The Reynolds number based on cylinder diameter (d) were 3500, 7000. Experiments were performed for various configurations. Based on obtained resul...

Experiments to determine positions of spherical and long particles and the orientation of long particles can be carried out in a stationary frame by fluidizing particle in a balance of the buoyant weight of the heavier than liquid particle with (1) drag, which will be realized in a vertical tube apparatus (2) hydrodynamic lift (perpendicular to flow, as in a lifting aircraft) which will be real...

Many micro-organisms swim through gels and non-Newtonian fluids in their natural environments. In this paper, we focus on micro-organisms which use flagella for propulsion. We address how swimming velocities are affected in nonlinearly viscoelastic fluids by examining the problem of an infinitely long cylinder with arbitrary beating motion in the Oldroyd-B fluid. We solve for the swimming veloc...

In this paper, we study the propagation of long periodic waves over semi-buried cylindrical objects in the bottom. We present a combination of laboratory wave tank experiments, with a sandy bottom, and numerical modeling, using a two-dimensional fully nonlinear potential flow model. Experiments provide wave elevation at gages and velocity fields measured around the semi-buried objects, using an...

An electromagnetic analysis is presented for experiments with strong permanent disc magnets. The analysis is based on the well known experiment that demonstrates the effect of circulating eddy currents by dropping a strong magnet through a vertically placed metal cylinder and observing how the magnet is slowly falling through the cylinder with a constant velocity. This experiment is quite spect...

We reinterpret the well known Taub-singularity in terms of a cylinder symmetric geometry. It is shown that a cylindrical analog to the Einstein-Rosen bridge as well as a cosmic string will be present in the geometry. PACS numbers: 02.40.tm , 04.20.Jb Typeset using REVTEX Electronic address: [email protected] Electronic address: [email protected] and [email protected] 1 It is a...

In the present study, the magnetic field effects of the elastic response of the polymeric piezoelectric cylinder reinforced with the carbon nanotubes (CNTs) are studied. The cylinder is subjected to an internal pressure, a constant electric potential difference at the inner and outer surfaces, and the thermal and magnetic fields. The Mori-Tanaka model is used for obtaining the equivalent materi...

The problem of the impact acoustic waves in a homogeneous viscoelastic cylinder is considered. investigation aims to investigate diffraction harmonic cylinder. body assumed be an infinite space filled with ideal fluid. Numerical calculations angular and frequency characteristics scattered field for cylinders under action are carried out. In case steady waves, Helmholtz equation describes propag...