Turbulence & Rheology, Dr. D. Penney

CAUSES OF TURBULENCE (separation of flow)

v .... stenosis, exercise, patent ductus arteriosus (shunt), cuff pressure between systolic and diastolic (arteriosclerotic plaque?)

p .... not clinically important in blood (specific gravity = 1.045)

r .... produces changes in v

Eta .... decreased hematocrit (anemia)

Re = vrp/Eta ....... "1000"

Note: turbulence damages blood vessel walls, increasing tendency for turbulence

Not found in the Reynolds equation:

  • wall surface character
  • tube configuration - bends, "corners"
  • time - for turbulence to form, to go away

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