3B Scientific Air Flow Apparatus - Manual (Page 6)

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Subject to technical amendments.
5.3 Course of flow around a spherical body
When air flows around a circular or spherical body,
the flow lines narrow around the body itself. The
velocity of flow also increases. Once the flow passes
the body, the flow velocity reduces.
5.4 Course of flow along a rectangular body
.
When air flows past a rectangular body, the flow
lines narrow around the body itself. The velocity of
flow also increases. Once the flow passes the body,
the flow velocity reduces.
5.5 Course of flow around a wing
Below the wing surface, the direction and velocity
of the air flow remain largely constant. Above the
wing surface, however, the flow velocity increases.
Owing to this, suction is created along the upper
wing surface.
5.6 Course of flow at a bottleneck
In this experiment, two flow bodies are introduced
into the air flow apparatus.
At a pinch or bottleneck, the distance between the
flow lines is reduced. Simultaneously, there is a
sharp increase in the flow velocity and the bodies
are sucked inwards. Thereafter the flow velocity
decreases.