Section 1 Flashcards
What are pathlines?
trajectories of a particle in space (follows one point on a line)
Flow dimension is what?
the number of non zero velocity components in a good system
Define steady flow
flow properties that are independent of time
What are steamlines?
fixed lines in space and tangent to velocity vector at every point of a fixed time
What is the primary difference with pathlines and streamlines?
pathlines = dt (variable with time) where as streamlines are at a specific point in time
Define volume flux
amount of properties crossing the surface
A system of fluid particles is defined as?
finite volume of particles with imaginary boundary
What is the control volume?
a fixed volume in space across which mass, heat, and work occur
What is meant by 1D steady flow?
uniform properties across streamlines, properties will only change along streamlines
What is the first law of thermodynamics?
conservation of energy
Define a reversible process.
ideal process in which there are no friction losses (system and surroundings can return to the same state after as was before)
Does entropy depend on the process?
NO
In a polytropic process, what will be constant for values of exponent n =0, 1, infinity, and gamma?
n=0 pressure is constant (isentropic)
n=1 temperature is constant (isothermal)
n=s=gamma s is constant (isentropic)
n = infinity volume is constant (isentropic incompressible)
