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What is doublet flow?
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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