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When both the source and sink are of equal strength it is called ________

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in Aerodynamics by (773k points)
When both the source and sink are of equal strength it is called ________

(a) sink

(b) source

(c) doublet

(d) positive derivative of flow

This question was posed to me in my homework.

Question is taken from Doublet Flow topic in chapter Inviscid & Incompressible Flow of Aerodynamics

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Best answer
Correct option is (c) doublet

Best explanation: Doublet is the special case of source and sink with equal strength. Let q and -q be the strength of source and sink respectively. Let 2a be the distance between the source and sink and it approaches zero. The product 2a*q is called as doublet strength.

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