Fluid Mechanics and Hydraulics Flashcards
6 cards from real ME or MEng Master of Engineering 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 and Hydraulics flashcards as text
Bernoulli's equation is derived from which conservation principle?
Answer: Conservation of energy
Bernoulli's equation is derived from the energy equation for steady, inviscid, incompressible flow along a streamline.
The Reynolds number for flow in a pipe transitions from laminar to turbulent at approximately:
Answer: Re = 2300
For pipe flow, laminar conditions persist below Re ≈ 2300, with transition to turbulence occurring between 2300 and 4000.
The Darcy-Weisbach equation is used to calculate:
Answer: Head loss due to friction in pipe flow
The Darcy-Weisbach equation h_f = f(L/D)(V²/2g) calculates major (friction) head losses in pipe flow.
Pascal's Law states that pressure applied to an enclosed fluid:
Answer: Is transmitted equally in all directions
Pascal's Law states that a pressure change at any point in a confined, incompressible fluid is transmitted equally throughout.
The continuity equation for steady incompressible flow requires that:
Answer: The product of cross-sectional area and velocity is constant
For incompressible steady flow, A₁V₁ = A₂V₂, meaning the volumetric flow rate is conserved along the flow path.
Dynamic viscosity has SI units of:
Answer: Pa·s
Dynamic (absolute) viscosity μ has SI units of Pascal-seconds (Pa·s), equivalent to N·s/m² or kg/(m·s).