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Unformatted text preview: considerably: General: 0 = Z CS ~ V · ~ ndA (13) 1D inlets & outlets: X i ( A i V i ) out = X i ( A i V i ) in (14) X i ± ˙ Q i ² out = X i ± ˙ Q i ² in (15) Average velocity: V av = Q A (16) Warnings Equation 3.29 contains a term (crossedout) with errors. It reads: d dt ±Z CV ∂ρ ∂ t dv ² (17) Should read: Z CV ∂ρ ∂ t d V (18) No real ﬂow is truly incompressible. You must judge whether the variations in ρ need to be considered. Sometimes ( e.g., liquids with narrow temperature range), it is obviously a good approximation. In other cases, Δ ρ must be compared to ρ and considered more carefully. Inclass examples: 314, 328...
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 Spring '11
 Schubring
 Fluid Dynamics, Mass, Trigraph, Incompressible Flow

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