Fluid Mechanics Flashcards
6 cards from real EIT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Fluid Mechanics flashcards as text
What does a Moody diagram show?
Answer: Friction factor as a function of Reynolds number and relative roughness
The Moody diagram plots the Darcy friction factor against Reynolds number for various pipe roughness values.
For a venturi meter, flow velocity is highest at:
Answer: The throat (narrowest section)
By the continuity equation, velocity is highest where the cross-sectional area is smallest — the throat.
The kinematic viscosity ν is defined as:
Answer: μ / ρ
Kinematic viscosity ν = μ/ρ is the ratio of dynamic viscosity to fluid density, with units of m²/s.
What does the Euler number represent in fluid mechanics?
Answer: Ratio of pressure forces to inertial forces
The Euler number Eu = ΔP/(ρv²) represents the ratio of pressure forces to inertial forces.
Which phenomenon occurs when local static pressure in a liquid drops below vapor pressure?
Answer: Cavitation
Cavitation occurs when local pressure falls below vapor pressure, causing vapor bubbles to form and collapse.
For open-channel flow, the Froude number Fr = 1 indicates:
Answer: Critical flow
At Fr = 1, the flow is critical, meaning flow velocity equals wave speed and the specific energy is at minimum.