Module 2 - Intro Flashcards
(9 cards)
What are the complimentary approaches to studying fluid mechanics?
Theoretical (analytical): solve governing equations
Numerical (computational): discretion governing eqn and fluid domain to get approximate solutions
Experimental: visualization, observations, measurements, field or lab experiments
Provide an example of each of the 4 groups of properties
Material: density, modulus of elasticity, coefficient of exp, conductivity, gas constant, mass, specific heat & volume, viscosity
Kinematic: displacement, velocity, acceleration, strain rate, vorticity, flow rates
Dynamic: forces, stress, pressure, torque
Thermo: energy, enthalpy, exergy, entropy, heat flux, heat transfer, work
Why are field experiments more challenging than lab experiments?
- Difficulty in reproducible flow conditions
- may require specialized equipment
- typically small sample sizes
How could you determine flow regime (turbulent/laminar) without Reynold number?
Dye injection
What is meant by spatial and temporal resolution?
Spatial: smallest flow structures/features that can be measured with an instrument or technique
Temporal: ability of an instrument to measure flow within certain time scales, the smallest time changes that a measurement instrument or technique can measure or detect
What is ensured by making a test model with similar dimensions, surface finish, etc as the real model?
Geometric similarity
What is needed to ensure the flow regime for a model is the same as the actual flow conditions?
Kinematic similarity
What is required to ensure the model experiences similar forces and moments to the actual structure?
Dynamic similarity
Define the following:
Reynolds number
Mach number
Pressure coefficient
Froude number
Re: ratio of inertia forces to viscous forces
Ma: ratio of local fluid velocity to local speed of sound
Cp: ratio of static pressure to dynamic pressure
Fr: ratio of inertial forces to gravitational forces
