# 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