Edinburgh University Wave Energy Project.
Duck efficiency
This photograph, taken by Jamie Taylor in 1976, is a one-second exposure of a duck model on a
fixed mounting in a narrow tank.
The orange and black wires are part of an electromagnetic
dynamometer,...
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Edinburgh University Wave Energy Project.
Duck efficiency
This photograph, taken by Jamie Taylor in 1976, is a one-second exposure of a duck model on a
fixed mounting in a narrow tank.
The orange and black wires are part of an electromagnetic
dynamometer, which is absorbing power.
Waves are approaching from the right.
Drops of a
neutrally buoyant tracer-fluid consisting of a mixture of carbon tetrachloride and xylene with
titanium oxide pigment have been injected to show the decaying orbits of wave motion.
The amplitude of the incoming waves can be measured from the thickness of the bright band.
Nodes and anti-nodes due to the small amount of reflection are evident.
However the thickness
of the bright band to the left of the model is largely due to the meniscus, as is confirmed by the
very small orbits of tracer fluid in this region.
As the energy in a wave is proportional to the
square of wave amplitude we can use the photograph to do energy accounting.
If reflected and
trans
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