1 Fluid General

Question 1

What is fluid mechancis?

Answer 1

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

Question 2

What is fluid dynamics?

Answer 2

fluid dynamics is the relations between velocities and accelerations and forces exerted by or upon fluid in motion

Question 3

What is fluid statics?

Answer 3

Fluid statics is the mechanics of fluids at rest

Question 4

What is the scope of biofluids?

Answer 4

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

Question 5

Reynolds #

Answer 5

ratio of inertial forces to viscous forces
as inertial forces go up turbulent flow increases
as viscous forces increase laminar flow increases

Question 6

no slip condition

Answer 6

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

Question 7

fluid

Answer 7

any material that deforms continuously under the application of a shear stress

Question 8

normal stress

Answer 8

force/area- the pressure created when force is applied normal to surface

Question 9

shear stress

Answer 9

gives us tau and it is the pressure created when the force is applied tangential to a surface

Question 10

• Define viscosity
• what symbol it
• represented by?
• Whats it units

Answer 10

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

Question 11

dynamic viscosity, unit mu

Answer 11

internal resistance to motion (units poise)

Question 12

kinematic viscosity, unit v

Answer 12

normalized version of the viscosity, *dynamic viscosity divided by density, units [stoke]

Question 13

strain

Answer 13

percent deformation

Question 14

strain rate

Answer 14

1/t

Question 15

blood is what type of fluid classification

Answer 15

it is nonewtonian were it is combination of bingham and pseudoplastic

Question 16

thixotropic

Answer 16

the apparent viscosity decreases under a constant shear stress

Question 17

rheopectic

Answer 17

the apparent viscosity increases under constant shear stress

Question 18

invisicid fluid

Answer 18

has no viscosity

Question 19

stress tensor

Answer 19

3X3 matrix-capture all multi dimension forces acting on the cube

Question 20

vorticity?

defined as?

Answer 20

measure of rotation of fluid elements,

defined as 2w

Question 21

laminae

Answer 21

layers

Question 22

streamline

Answer 22

is a line that is tangential to the instantaneous velocity direction

Question 23

laminar flow

Answer 23

highly ordered fluid motion characterized by smooth layers of fluid

Question 24

turbulent flow

Answer 24

highly disordered flow that occurs at high velocities, velocity fluctuations