Flashcards
ME351 Exam
Cards in this deck (15)
- 1Bernoulli Assumptions (x6)1. Steady Flow
2. Frictionless Flow
3. Incompressible
4. No Shaft Work
5. No Heat Transfer
6. Evaluated over one streamline - 2Internal Flow - Critical Reynolds #?Re > 2000 is Turbulent
- 3External Flow - Critical Reynolds $Re > 500,000 is Turbulent
- 4Viscousfriction btw fluid particles
- always important near wall (no slip) - 5Inviscidviscous effects negligible
- always important near wall (no slip) - 6Internal Flowflow confined by/between walls
i.e. flow through valve or pipe - 7External Flowflow not confined by walls
i.e. lift, drag - 8Incompressibleif density (p-rho) is constant
- liquids almost always incompressible
- air is compressible but can be incomp at low Ma# - 9Compressibleif changes in density (p-rho) are significant
- 10Mach Number= speed of fluid / speed of sound
Ma =< 0.3, incompressible
- if V > c = supersonic - 11Laminar"lamina" meaning smooth, orderly
typically steady
typically @ low speed - 12Turbulentchaotic, unsteady, random eddies
typically at high speed - 13Laminar flow in circular pipe- parabolic velocity profile
- highest velocity at center
- zero velocity at edges
-low Reynolds #
- viscous flow - 14Turbulent flow in circular pipe- top-hat velocity profile
- highest velocity at center
- zero velocity at edges
- high Reynolds #
- approx. inviscid flow - 15Fully Developed Pipe Flow- effects of viscosity are fully present & the pipe entrance effects are not taken into account
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- Flashcards on ME351 Exam, created by Kalany Bissonette on 19/04/2024.
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- Kalany Bissonette
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