1 Fluid General Flashcards
What is fluid mechancis?
any system that operates in a fluid medium and can be analyzed by mechanic principles. This is divided into different fields including fluid statics, kinematics, and fluid dynamics
What is fluid dynamics?
fluid dynamics is the relations between velocities and accelerations and forces exerted by or upon fluid in motion
What is fluid statics?
Fluid statics is the mechanics of fluids at rest
What is the scope of biofluids?
The scope of biofluids is essential the study of the fundamentals of biological fluid flow.This is important because it is essential to understand how changes in the flow behavior within living tissue may affect both the fluid and the tissue
Reynolds #
ratio of inertial forces to viscous forces
as inertial forces go up turbulent flow increases
as viscous forces increase laminar flow increases
no slip condition
it is a model used to characterize fluid flow over a plate. 1st layer is stationary it creates a velocity gradient, it allows us to simplify velocity equations
fluid
any material that deforms continuously under the application of a shear stress
normal stress
force/area- the pressure created when force is applied normal to surface
shear stress
gives us tau and it is the pressure created when the force is applied tangential to a surface
- Define viscosity
- what symbol it
- represented by?
- Whats it units
fluid property that relates shear stress to shear rate. Its is the fluid resistance to motion.
mu is its symbol. and its units are NS/m^2 or PaS or poise
dynamic viscosity, unit mu
internal resistance to motion (units poise)
kinematic viscosity, unit v
normalized version of the viscosity, *dynamic viscosity divided by density, units [stoke]
strain
percent deformation
strain rate
1/t
blood is what type of fluid classification
it is nonewtonian were it is combination of bingham and pseudoplastic
thixotropic
the apparent viscosity decreases under a constant shear stress
rheopectic
the apparent viscosity increases under constant shear stress
invisicid fluid
has no viscosity
stress tensor
3X3 matrix-capture all multi dimension forces acting on the cube
vorticity?
defined as?
measure of rotation of fluid elements,
defined as 2w
laminae
layers
streamline
is a line that is tangential to the instantaneous velocity direction
laminar flow
highly ordered fluid motion characterized by smooth layers of fluid
turbulent flow
highly disordered flow that occurs at high velocities, velocity fluctuations
