Questions
BH40A1401 Fluid Mechanics I - Contact teaching, Lappeenranta 6.1.2025-23.2.2025 Quiz 2
Multiple choice
Consider volume V with incoming and outgoing flows. The fluid cannot be considered incompressible. Which of the following variations of continuity equation can be used to describe the situation?
Options
A.a. ρ1w1A1 + ρ2w2A2 = ρ3w3A3
B.b. qv,1 + qv,2 = qv,3
C.c.
D.d.
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Step-by-Step Analysis
The problem asks which variations of the continuity equation can be used for a volume V with incoming and outgoing flows when the fluid is not incompressible.
Option a: ρ1 w1 A1 + ρ2 w2 A2 = ρ3 w3 A3
This form expresses conservation of mass by summing the mass fluxes (density ρ times velocity w times cross-sectional area A) at all ports. In a compressible flow, density can chang......Login to view full explanationLog in for full answers
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