Images of the apparatus used to create a flowing film of soap. A reservoir of a soap/water
mixture sits on top of the apparatus and flows through a tube to two string which
forms the border of the flowing film. Models are place on the end of a ruler, which is used
as a torque balance. By balancing torques, one can determine the force acting on
a model due to the flowing fluid. One of the models studied can be
seen mounted on the end of the torque balance.
Images of the soap film. Fishing line is used to form the border of the flowing film.
One can see the colors in the film (due to light interference - the so-called "thin film" phenomena.).
Changes in the fluid flow can be observed by projecting light through
the flowing film. Several models were studied.
1. Triangular block in different orientations.
2. Car model with sharp edges.
3. Car model with rounded edges.
One can see turbulence emerging from the sharp edges. It is also seen that the sharp edged models deflect the fluid more laterally than the smooth edged models.
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