PowerPoint Presentation: Experiment 3. Liquid Viscosity Nina Clavio Argela Olbes
PowerPoint Presentation: INTRODUCTION
Viscosity: Viscosity - Migration of linear momentum along a velocity gradient. - Fluid’s resistance to flow
Viscosity: Viscosity 2 types: dynamic/ absolute kinematic
Dynamic or Absolute: Dynamic or Absolute Measure of internal resistance Tangential force per unit area required to move one horizontal plane with respect to another at a velocity maintained at a distance
Dynamic or Absolute: Dynamic or Absolute
Dynamic or Absolute: Dynamic or Absolute Τ = ɳ dc/ dy where: Τ = shearing stress ɳ = dynamic coefficient
Kinematic: Kinematic ratio of absolute or dynamic viscosity to density a quantity in which no force is involved obtained by dividing the absolute viscosity of a fluid with it's mass density
Kinematic: Kinematic v = ɳ / ρ where: v = kinematic viscosity Ρ = density
Viscosity: Viscosity 2 factors: Intermolecular forces of attraction (strong bonds = high viscosity) Temperature (high temp = low viscosity) Pressure (high pressure = high viscosity) Velocity (high velocity = low viscosity)
Viscosity: Viscosity Other factors: Size of molecules (bigger molecules, high viscosity) Shape of molecules (oval and disk-like molecules, high viscosity) Note: not generally applicable
Ostwald Viscometer: Ostwald Viscometer
Poiseuille Equation: Poiseuille Equation
PowerPoint Presentation: Methodology
methodology: methodology clean viscometer with chromic acid sol’n , soap and distilled water 5.0 mL distilled water into viscometer Water bath (15 mines)
methodology: le methodology measure as liquid flows from upper to lower mark