Abstractwall interference, and experimental uncertainties. These are serious problems even The dynamic stall characteristics of for static stall, as indicated by the eight airfoils have been investigated in results plotted in Fig. 1 for two very sinusoidal pitch oscillations over a wide different airfoils. The shaded band shows, range of two-dimensional unsteady flow for the classical NACA 0012, the spread of conditions. The results provide a unique measured values of the maximum lift coefcomparison of the effects of section geomficient from our experiment and from those etry in a simulated rotor environment, reported previously.
Using in-situ synchrotron tomography, we investigate the coarsening dynamics of barium borosilicate melts during phase separation. The 3-D geometry of the two interconnected phases is determined thanks to image processing. We observe a linear growth of the size of domains with time, at odds with the sublinear diffusive growth usually observed in phase-separating glasses or alloys. Such linear coarsening is attributed to viscous flow inside the bicontinuous phases, and quantitative measurements show that the growth rate is well explained by the ratio of surface tension over viscosity. The geometry of the domains is shown to be statistically similar at different times, provided that the microstructure is rescaled by the average domain size. Complementary experiments on melts with a droplet morphology demonstrate that viscous flow prevails over diffusion in the large range of domain sizes measured in our experiments (1 -80 µm).
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