cram flow Midterm 1

Question 1

Viscosity

Answer 1

internat friction

Question 2

ideal fluid

Answer 2

frictionless and incompressible

Constant density and Constant viscosity

Question 3

non ideal fluids

Answer 3

newtonian/viscous:
Viscosity is independent of shear stress

non-newtonian/anomalous:
Viscosity changes with shear stress
e.g: blood

Question 4

viscoelastic materials

Answer 4

combination of viscous and elastic properties

e.g: Polymers or macromolecules

Question 5

stress-relaxation:

Answer 5

decay of stress in rapidly deformer viscoelastic body

Question 6

types of flow

Answer 6

stationary
laminat
turbulent

Question 7

stationary flow

Answer 7

volumetri flow rate stats constant

Question 8

laminar flow

Answer 8

fluid layers do not mix

Question 9

turbulent

Answer 9

fluid layers mix.

when average velocity is Close to critical velocity

Question 10

reynolds number

Answer 10

helps predict flow patterns in different fluid flow situations

Re = vrp/n

found between laminar and turbulent

Question 11

Continuity equation

Answer 11

volumentric flow rate is Constant

a1v1=a2v2

Question 12

Bernoulli’s law

Answer 12

law of conservation of Energy

static pressure + dynamic pressure + hydrostatic pressure = constant

p + 0,5pv^2+pgh =constant

e.g: when velocity increases, pressure is reduced

Question 13

Venturi effect

Answer 13

Static pressure drops when fluid flows in a constricted Area -> tube narrowing.

e.g: biphasic pulse and vacum cleaner

Question 14

Stokes law

Answer 14

. Describes the hydrodynamic drag Force. Note that this drag force is directly proportional to the radius

F = γv = 6rπηv