week 2 Flashcards
(25 cards)
what is mechanics
this is physical science with deals with both stationary and moving bodies under influence of forces
what is statics
The branch of mechanics that
deals with bodies at rest.
what is dynamics
The branch that deals with
bodies in motion
what is fluid mechanics
The science that
deals with the behavior of fluids at rest or in motion
what is hydrodynamics
The study of the motion of fluids
that can be approximated as incompressible (such as
liquids, especially water, and gases at low speeds)
hydraulics
A subcategory of hydrodynamics, which
deals with liquid flows in pipes and open channels
gas dynamics
Deals with the flow of fluids that
undergo significant density changes, such as the flow
of gases through nozzles at high speeds
aerodynamics
deals with flow of gases over bodies, like car or plane body
what is viscous flow
: Flows in which the frictional effects are significant
external flow
The flow of an unbounded fluid over a surface such
as a plate, a wire, or a pipe
internal flow
The flow in a pipe or duct if the fluid is completely
bounded by solid surfaces
incompressible flow
If the density of flowing fluid remains
nearly constant throughout
compressible flow
If the density
of fluid changes during flow (
laminar flow
smooth fluid travel at high velocity
turbulent flow
highly distorted fluid motion that happens at high velocities
transitional flow
a flow that changes between laminar and turbulent
what is a system
A quantity of matter or a region
in space chosen for study.
what is dynamic viscosity
the shear stress required to drag one layer of fluid with unit velocity past a unit distance
what is fluid static
this is when no shearing force is acting on the fluid
any force between the fluid and the boundary is acting at right angles to the boundary
sum of forces equal to 0
what is viscous flow
Flows in which the frictional effects are significant
Inviscid flow regions
the flow of an ideal fluid that is assumed to have no viscosity
what is a boundary
a surface which separates the system (a quantity of matter) from its surroundings
can liquid be compressed
liquid is difficult to compress and is often regarded incompressible
what happens to the molecules of a liquid when heated up
it reduces the cohesive force (how sticky the molecules are) and increases molecule interchange
