BME 409 EXAM 1 QUESTIONS WITH ANSWERS
100% SOLVED
system - ANSWER some quantity of matter or a region in space chosen for study (closed
or open)
boundary - ANSWER real or imaginary surface separating the system from its
surroundings
closed - ANSWER consists of fixed amount of mass
open (control volume) - ANSWER properly selected region of space (and typically
involves mass flow)
density - ANSWER mass over volume, tends to be temperature and pressure dependent
specific gravity - ANSWER ratio of density of substance to the density of some standard
(typically at some specific temperature)
density of water - ANSWER 1 g/mL, 1000 kg/m^3
density of blood - ANSWER 1.06 g/cm^3
,SG of water - ANSWER 1
SG of blood - ANSWER 1.06
for specific gravity, what do we typically use for the temperature? - ANSWER 4 degrees
celsius
vapor pressure - ANSWER pressure exerted by its vapor in phase equilibrium with its
liquid at some given temperature
cavitation - ANSWER when the local pressure drops at or below that pressure of the
liquid--> have the formation of gaseous or vaporous bubbles
what is cardiac output of normal adult human heart? - ANSWER 5 L/min
from the video we watched in class, what was happening? - ANSWER - valve was closing
towards us, a vortex formed, and local pressure is at or below vapor pressure so
cavitation occurred
- the problem is during the collapse of the valve, if vapors are near RBCs or platelets, it
will destroy them
viscosity - ANSWER (analogous to frictional force) providing some resistance to a fluid
, does the viscosity of whole (pure) blood = viscosity of plasma? - ANSWER no
rheology - ANSWER the study of deformation of flow of matter
drag - ANSWER force that a flowing fluid exerts on a body in the flow direction
what are the plates doing in couette flow? - ANSWER 2 parallel plates, one stationary
and one moving with constant velocity
what is shear force equal to? - ANSWER viscosity * change in velocity
Newtonian - ANSWER rate of deformation is proportional to shear stress (water, air, gas)
non-Newtonian - ANSWER rate of deformation is NOT proportional to shear stress
(blood)
what are the units of dynamic viscosity? - ANSWER centipose (cp)
Pa*s
N*s/m^2
kg/m*s
100% SOLVED
system - ANSWER some quantity of matter or a region in space chosen for study (closed
or open)
boundary - ANSWER real or imaginary surface separating the system from its
surroundings
closed - ANSWER consists of fixed amount of mass
open (control volume) - ANSWER properly selected region of space (and typically
involves mass flow)
density - ANSWER mass over volume, tends to be temperature and pressure dependent
specific gravity - ANSWER ratio of density of substance to the density of some standard
(typically at some specific temperature)
density of water - ANSWER 1 g/mL, 1000 kg/m^3
density of blood - ANSWER 1.06 g/cm^3
,SG of water - ANSWER 1
SG of blood - ANSWER 1.06
for specific gravity, what do we typically use for the temperature? - ANSWER 4 degrees
celsius
vapor pressure - ANSWER pressure exerted by its vapor in phase equilibrium with its
liquid at some given temperature
cavitation - ANSWER when the local pressure drops at or below that pressure of the
liquid--> have the formation of gaseous or vaporous bubbles
what is cardiac output of normal adult human heart? - ANSWER 5 L/min
from the video we watched in class, what was happening? - ANSWER - valve was closing
towards us, a vortex formed, and local pressure is at or below vapor pressure so
cavitation occurred
- the problem is during the collapse of the valve, if vapors are near RBCs or platelets, it
will destroy them
viscosity - ANSWER (analogous to frictional force) providing some resistance to a fluid
, does the viscosity of whole (pure) blood = viscosity of plasma? - ANSWER no
rheology - ANSWER the study of deformation of flow of matter
drag - ANSWER force that a flowing fluid exerts on a body in the flow direction
what are the plates doing in couette flow? - ANSWER 2 parallel plates, one stationary
and one moving with constant velocity
what is shear force equal to? - ANSWER viscosity * change in velocity
Newtonian - ANSWER rate of deformation is proportional to shear stress (water, air, gas)
non-Newtonian - ANSWER rate of deformation is NOT proportional to shear stress
(blood)
what are the units of dynamic viscosity? - ANSWER centipose (cp)
Pa*s
N*s/m^2
kg/m*s
