Ronald J. Adrian

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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)
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, +30 authors San Mateo
  • 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)
Experiments are performed in Taylor-Couette flow where the inner-cylinder angular velocity is modulated in time about zero mean. eory and nonlinear computations have previously found this case to be characterized by two competing modes. Both are axisymmetric and synchronous with the modulation, but have different spatio-temporal symmetries and axial(More)
A simple experiment demonstrates that an average vertical force can be produced by a small vibrator motor attached to a frame constrained to slide vertically on guide wires. The vertical force produced is sufficient to make the sliding element hover, similarly to a biologically inspired robotic insect. We show that this effect depends on the natural(More)