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Chapter 1 Vocabulary

Chapter 1 Vocabulary of Mechanics of Fluids for ODU.

Terms

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γ
ratio of specific heats = cp/cv
Supersonic flow
Flow with Mach number greater than 1
Fluid Mechanics
The study of fluids at rest and in motion and the forces acting within the fluid and on any solid boundary the fluid contacts
cp
Specific heat at constant pressure
Hypersonic flow
Flow with Mach number equal to 6 or greater
R
Gas constant for the flowing gas
Fluid Dynamics
The study of fluids at motion
Transonic flow
Flow with Mach number from 0.8 to 1.2
Incompressible Fluid
A fluid which has constant density
d'Alembert's Paradox
Measurement of a finite value of drag in a wind tunnel experiment when zero drag was expected due to an inviscid fluid assumption
specific weight
weight per unit volume
Compressible Fluid
A fluid which has variable density
Laminar Flow
Flow characterized by steady values of physical parameters with respect to time and which has negligible mass diffusion normal to flow direction
Turbulent Flow
Flow characterized by unsteady values of physical parameters with respect to time and which has appreciable mass diffusion normal to the flow direction
Viscosity
Physical characteristic of a fluid which gives a measure of its ability to flow
Non-Newtonian Fluid
A fluid which displays a non-linear relationship between shear stress and strain
Fluid Statics
The study of fluids at rest
Subsonic flow
flow with Mach number less than 1
T
Absolute Temperature in Kelvin or Rankine
solid
a material that initially deforms under the application of a shear stress but does not continue to deform - additional deformation results in failure
cv
Specific heat at constant volume
Sonic flow
Flow with Mach number equal to 1
Compressible Flow
Flow of a gas at a Mach number greater than 0.30
Inviscous Fluid
Fluid with a viscosity of 0
Mach Number
Local Flow speed divided by speed of sound
Specific gravity
Density of a material divided by density of water
Fluid
- a material that initially deforms under the application of a shear stress and continues to deform; matter in liquid or gaseous state
Steady Flow
Fluid in which physical characteristics are independent of time
Newtonian Fluid
Fluid which displays a linear relationship between shear stress and strain
Speed of Sound
√ (γ R T)
Unsteady Flow
Fluid in which physical characteristics are dependent of time
Viscous Fluid
Fluid which has a finite value of viscosity and in which friction is important

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