Fluids Flashcards
Weight of a volume = ?
Fg = density . V . g
Specific gravity = ?
SG = density / 1 g/cm^3
Pressure = ?
F (normal force)/A
760 mmHg = ? Pa
1 . 10^5 Pa
760 mmHg = ? atm
1 atm
Net force on an object with pressure differentials on each side (like a window) = ?
Fnet = (Poutside - P inside) . A
Absolute (hydrostatic) pressure =?
P = Po (at the surface) + density(fluid).g.z (depth)
Gauge pressure = ?
P gauge = P - P atm
What are the 3 equations for Pascal’s principle and what does it apply to?
P = F1/A1 = F2/A2
V = A1d1 = A2d2
W=F1d1=F2d2
Applied to hydraulic systems
What is the buoyant force equal to?
Fbuo = density of fluid . Volume of fluid displaced . g = density of fluid . Volume of fluid submerged . g
How can you tell if an object is floating based on its density?
If its average density
Poiseuille’s law = ?
Q = pi . r^4 . Delta P / 8. viscosity. L
Critical speed of a fluid = ?
Vc = Nr (Reynolds number) . viscosity / density. D (diameter)
Continuity equation = ?
Q = v1.A1 = v2.A2
Bernouilli’s equation = ?
P1 + 1/2.density.v1^2 + density.g.h1 = same with 2s
When 1 liquid rests on the other, what is Patm in the gauge pressure equation of the liquid on the bottom?
P atm = Patm + gauge P of liquid on top
Is the speed of the blood faster in the aorta or the capillaries? Why?
Blood in aortas is faster than in capillaries, because the sum of all cross-sectional areas of capillaries is larger than the cross-sectional area of aorta.
Which equation in this chapter is applicable to human circulation?
Poiseuille’s Law
What is the effect on pressure of decreasing a fluid’s speed?
Increase the pressure!
What is necessary for a fluid to flow out of something? What is an example?
Its pressure needs to exceed to pressure of the system it is going into → in order to breath out, pressure in the alveoli needs to be higher than atmospheric pressure
What is a super critical fluid?
Any substance at a temperature and pressure above its critical point, where distinct liquid and gas phases do not exist. It can effuse through solids like a gas, and dissolve materials like a liquid.
