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The structure of energy-containing turbulence in the outer region of a zero-pressure-gradient boundary layer has been studied using particle image velocimetry (PIV) to measure the instantaneous velocity fields in a streamwise-wall-normal plane. Experiments performed at three Reynolds numbers in the range 930 < Re θ < 6845 show that the boundary layer is(More)
A micron-resolution particle image velocimetry (micro-PIV) system has been developed to measure instantaneous and ensemble-averaged flow fields in micron-scale fluidic devices. The system utilizes an epifluorescent microscope , 100—300 nm diameter seed particles, and an intensified CCD camera to record high-resolution particle-image fields. Velocity vector(More)
Instantaneous velocity fields in the x-y plane of a zero pressure gradient turbulent boundary layer are measured using particle image velocimetry. It is found that there exist random, time-varying zones in the U-V fields in which the streamwise momentum is remarkably uniform. The largest dimension of a typical zone is proportional to the boundary layer(More)
Suspensions of nanoparticles (i.e., particles with diameters < 100 nm) in liquids, termed nanofluids, show remarkable thermal and optical property changes from the base liquid at low particle loadings. Recent studies also indicate that selected nanofluids may improve the efficiency of direct absorption solar thermal collectors. To determine the(More)
  • P M Saffman, H Buchhave, Tanger, G M Saffman, G Fraidl, Wigley +27 others
  • 2000
Simultaneous measurement of size, concentration and velocity of spherical particles by a laser Doppler method", in Laser Anemometry in Fluid Mechanics II,Application of phase and laser doppler anemometry to the measurement of droplet size and velocity in gasoline and diesel fuel injection systems", in ApplicationsDynamic optical interconnects using(More)
We studied left ventricular flow patterns for a range of rotational orientations of a bileaflet mechanical heart valve (MHV) implanted in the mitral position of an elastic model of a beating left ventricle (LV). The valve was rotated through 3 angular positions (0, 45, and 90 degrees) about the LV long axis. Ultrasound scans of the elastic LV were obtained(More)