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| Equations of Continuity |
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| Consider a non-viscous liquid in streamline flow through a tube AB, of varying cross-section. Let A1 and A2 be the area of cross-section at A and B respectively. |
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| The volume of water entering A per second = A1V1 |
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| Volume = Area x distance |
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| where V1 is the velocity of the flow of liquid at A |
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| Assuming there is no loss of liquid in tube and for free steady flow, |
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| Mass of liquid entering per second at A |
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| = Mass of liquid leaving per second at B |
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| or AV = constant. |
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| This is the equation of continuity. |
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