Mass balance
Fluid mechanical basic equations
Article REF: BE8153 V2
Mass balance
Fluid mechanical basic equations

Author : André LALLEMAND

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

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2. Mass balance

2.1 Local mass conservation equation

The equation (3) is used to calculate the variation in mass over time. Indeed, if G represents the mass M of the system, ρ is the magnitude per unit volume. The relationship (3) then becomes, considering that mass is conservative (no mass creation) and using Ostrogradski's theorem [equation

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