https://prezi.com/erkyjtww8fer/historia-de-la-pasta/
martes, 12 de mayo de 2015
martes, 28 de abril de 2015
lunes, 27 de abril de 2015
martes, 3 de marzo de 2015
lunes, 16 de febrero de 2015
martes, 10 de febrero de 2015
SPIRAL BUBBLE WAVES
Having mapped
out that general types of coiling, we imagine that we had a fairly complete
picture but we were wrong. Further experiments, conducted in an exploratory way
with no preconceived ideas, revealed remarkable new phenomena.
The first was
the appearance of beautiful spiral waves of air bubble in the thin layer of
fluid that spreads away from the coiling rope. They form when the successive
loops of the rope are slightly offset from one and other, trapping small air
pockets. We still do. Do not understand, however, why the spiral had precisely
the shape they do or why they only occur for narrow ranges of fluid viscosity,
flow rate and fall height.
We also played with silicone oils of
much lower viscosity. These fluids coiled more quickly up to 2000 times per
second so we need high speed cameras to record the behavior.
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