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V z. V y. Area = δ a r. V x. Flow through an element of the surface (Regional Integration). Computing by integration over the region, we get, for the flow through one surface resulting from the z-direction components of velocity:.
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Vz Vy Area = δar Vx Flow through an element of the surface(Regional Integration) Computing by integration over the region, we get, for the flow through one surface resulting from the z-direction components of velocity: The expanding for upper and lower surfaces and for all three directions we get Rate of flow through the element