Answer 1:
Doublet flow is a term in fluid dynamics that
describes the flow in a particular type of
system. Doublet flow is the fluid flow that is
achieved when a source and sink are placed close
together.
A point is a source if an object
placed near it would flow directly away from
that point.
A point is a sink if an object placed
near it would flow directly toward that
point.
When the two are place near each other, their
flow patterns combine to create loops in the
fluid flow. This is called a doublet flow; the
diagram below shows what it looks like.
picture
Doublet flow can also be used to describe
many things in physics including the field lines
of a dipole, and as an approximation for the
behavior of a particle/anti-particle pair
generated in a vacuum.
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