Time rate of change of the volume of a fluid element per unit volume.
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It's a really big exercise and I've almost finished it and I'm probably overlooking something really simple. The question is: "Calculate the time rate of change of the volume of the fluid element, per unit volume." I've worked it down to : ∇* V =-0,01166112137. The answer is -0,7327 s-1. How do I make this small step?
Your formatting isn't working and your number doesn't have any units.
From the continuity equation:
∇∙(ρv) + ∂ρ/∂t = 0.
The quantity you want is (∂V/∂t)
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