RELATIVE FLOW RATES IN VESSEL ELEMENTS
PROTO META SECONDARY Laminar flow in capillary follows Poiseuille's Law 

 p = 
(8 * l * u * v) /( p * r4)   

or

  v = 
(p * r4 * p) / (8 * l * u)

p = driving pressure required to move a fluid 
with viscosity = u,
at a rate = v (ml per sec),
through a capillary of radius = r and 
length = l.