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Fluids Vocab Quiz

TermDefinition
Solid vs. Fluid Solids reach new equilibrium with applied shear while fluids constantly deform creating fluid motion.
Liquid A fluid with strong cohesive forces that can form a free surface and retains its volume
Gas A fluid with negligible cohesive forces that fills its available volume and can't form free surfaces.
Molicule Two or more atoms bonded together
Particle A part of somthing
Continuum vs. Rarified Continuum is most cases Rarified if pressure so low that mean free path and molecular spacing is greater than the space
Inviscid An ideal fluid with zero viscosity
Temperature A measure of average thermal energy in a defined volume
Pressure Force per unit area
Static Pressure Pressure in the fluid irregardless of motion
Gauge Pressure Value of pressure above atmospheric pressure found by subtracting atmospheric from fluid pressure. Also the value on a relative gauge
Vacuum Pressure Negative value of gauge pressure
Absolute/Total Pressure The total value of the fluid pressure including atmospheric pressure
Vapor Pressure Pressure at which a liquid boils at a specified temperature
Dynamic Pressure Kinetic energy per unit volume of a fluid
Plasma An ionized gas
Boundary Layer A layer above a surface where a flow characteristic is effected by the surface
Fields (force and Properties) A directional field
Rotation vs. Irrotational Rotational flow requires a local change in angular velocity.
Buoyancy The upward force on a submerged object due to pressure differentials
Scalar, Vector, Tensor Directional(value of 1), value with scale and direction, a geometric relation between a number of vectors or scalars
Surface tension The imbalance of intermolecular forces at the surface that cause fluids to cling to each other at a boundary and retard expansion.
Wetting vs. Non-Wetting (hydrophilic vs hydrophobic) has to do with contact angle cause by surface tension. Wetting greater than 90 non-wetting less than 90
Specific Gravity Compares density of a fluid to that of a known fluid usually water at 4 degrees C or air for gasses
Cavitation liquid flow goes below vapor pressure due to flow phenomenon which produce small vapor bubbles
Boil/Vaporize A phase change from liquid to solid
Viscosity (viscous vs inviscid) A measure of a fluids resistance to flow based on a measure of its strain rate under an applied shear.
Kinematic Viscosity Diffusivity of momentum
Newtonian Fluid a fluid with a linear relationship between shear stress and strain rate
Dilatant vs. pseudo plastic (shear thickening vs shear thinning) Dilatant increases viscosity with increased strain while pseudo plastics lower their viscosity.
Isothermal A process that occurs at constant temperature
Adiabatic Without heat transfer
No-slip Boundary condition vs Slip Means that the fluid in contact with a surface experiences no slip. Slip occurs in rarefied gasses.
Reynolds Number A ratio of inertia over viscus forces that characterizes flow behavior
Langrangian vs. Eulerian Langrangian moves with the flow while Eulerian watches the flow
Compressible vs. Incompressable Ability to experience changes in density vs. constant density
Vorticity and angular velocity Local changes in angular position
Internal vs. External Flow Bounded vs. unbounded flow
Created by: 808920220
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