An experimental investigation was conducted to quantify the characteristics of the turbulent boundary layer flows over a dimpled surface in comparison to those over a conventional flat plate. In addition to measuring surface pressure distributions to determine the friction factors of the test plates and to map the surface pressure inside the dimple cavity, a high-resolution digital particle ima...

Wear particles in a hard disk drive may cause the head/disk interface to fail. We have experimentally investigated wear particle generation resulting from fretting wear between the dimple on the suspension and the gimbal spring. We have found that increasing the normal load as well as using a low friction coating reduces the formation of wear particles. INTRODUCTION Examination of failed hard d...

numerical and experimental analyses are performed on multilouvered fin banks in low and medium reynolds regimes to investigate the effects of dimples and perforations on flow structure and heat transfer capacity. in different reynolds numbers the flow efficiency has been calculated numerically and experimentally by flow visualization method and the results showed that dimples and perforations c...

When a drop impacts a surface, a dimple can be formed due to the increased air pressure beneath the drop before it wets the surface. We employ a high-speed color interferometry technique to measure the evolution of the air layer profiles under millimeter-sized drops impacting hydrophobic micropatterned surfaces for impact velocities of typically 0.4 m s(-1). We account for the impact phenomena ...

The coupled phonon —surface-wave modes of a two-dimensional Wigner crystal resting on the surface of a liquid are studied. It is shown that, in experimentally accessible situations, the threshold for the formation of the macroscopic "dimple crystal" predicted by Gor'kov and Chernikova is negligibly influenced by the presence of the Wigner crystal, and that the coupled phonon —short-wavelength-s...

Multimedia cooperative work has several requirements not supported by existing shared systems. A multimedia distributed platform, DIMPLE, suitable for constructing interactive and distributed multimedia applications, was enhanced to support shared multimedia applications. This paper describes these enhancements and presents a typical application of shared synchronized access to an information r...

For shallow caps under an axisymmetric external pressure distribution which is inward (with a representative magnitude pO) in a neighborhood of the pole and outward away from the pole, it has been shown previously that a finite axisymmetric dimple state of deformation is possible if p0 is at least of the order of the classical buckling pressure for a complete spherical shell, Pi, and that, asym...

A boy was born with a patch of hair over the spine with a dimple at its cranial aspect (Fig. 1). The pediatrician assured the parents that the hair would eventually fall out and the dimple was harmless. Later on, parents visited another physician for the toddler's constipation and urinary tract infections, who recognized significance of hairy patch at sacrum. The magnetic resonance imaging (MRI...