Balance of momentum
Fluid mechanical basic equations

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BE8153 V2 Article

Balance of momentum


Fluid mechanical basic equations

Author : André LALLEMAND

Publication date: July 10, 2015, Review date: January 4, 2020 | Lire en français

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3. Balance of momentum

The quantity of motionQM attached to a material system can only vary over time (in the sense of creation or destruction) if the system is subject to a non-zero force torsor. Thus, noting that the quantity of motion attached to the unit volume of fluid is ρv, the balance equation (6) attached to this vector quantity is written :

D(QM)dt=Vρ
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