Lecture 1 Flashcards
(16 cards)
Effect of doubling syringe diameter/doubling the radius
Pressure is reduced by factor of 4
Interrelationship of pressure and force equation
P=f/a or P=f/pi(r^2)
10.2 cm^3 of water weighs x?
10.2 g because density is 1g/ml
Laplace’s law for a tube
Ptube=tension/radius
Laplaces law for spherical shape
Psphere=2T/r
Flow is defined as
The quantity of a fluid passing a point in unit time
F=Q/t where Q is the quantity
Hagen-poiseuille equation for flow
Q=(PIr^4deltaP)/(8etal) where eta is viscosity
Hagen-poiseuille equation for pressure
Delta P=(PIr^4Q)/(8etal) where eta is viscosity
Flow is directly related/proportional to
The radius to the 4th power
Reynolds number (equation)
Reynolds number= (vrhod)/(eta) where v is volume, rho is density, d is diameter, eta is viscosity
Heliox color
Green and brown stripes (US)
Heliox ratio
70:30 and possible 80:20
Pressure in a Venturi
Pressure at narrowest point Is lower than elsewhere and often below atmospheric pressure
If pressure at a point (Venturi) is below atmospheric pressure, air or another fluid can be
Entrained through the side tube at the narrowest point
Entrainment ratio
=entrained flow / driving flow
Calculating fio2
(O2 liters + air liters*0.21)/total flow
