Experiment 1-Viscosity and Density- Spring 2010.pdf

Experiment 1-Viscosity and Density- Spring 2010.pdf - Fluid...

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Fluid Mechanics Lab Spring 2009-2010 EXPERIMENT No. 1 FLUID VISCOSITY AND FLUID DENSITY AND SPECIFIC GRAVITY Part (1) – Fluid Viscosity Viscosity Apparatus Objective: Determination of: ¾ Dynamic and kinematic viscosities for the provided oil. ¾ Comparison between the achieved experimental results and the corresponding standard values. Theoretical background: When the fluid in motion it experience a friction force that is directly proportional to its velocity gradient, which can be written as The constant of proportionality is called the coefficient of viscosity μ It is also found that the dynamic viscosity is directly proportional to the kinematic viscosity as: ʋ = μ / ρ
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Fluid Mechanics Lab Spring 2009-2010 where ʋ - is the kinematic viscosity, ρ - is the density of the fluid The kinematic viscosity ( ʋ ) can be estimated from either one of the following equations: Where 1. m: The mass of the sphere (g) 2. d: The diameter of the sphere (mm) 3. δ : The density of the sphere (g/cm3) 4. ρ :Density of the liquid (g/cm3) 5. v: Velocity of fall (mm/s) 6. g: Local acceleration due to gravity (mm/s2) 7. F: Faxen actor for the effect of the walls of a tube of diameter (D) on the motion of the spheres of diameters (d). The factor is calculated as: F = 1 - 2.104d/D +2.09(d/D) 3 - 0.9(d/D) 5 (D = 1.98 in, d is either: d1 = 3/32 inch, or d2 = 1/16 inch) Apparatuses: 1) Glass tube of 1.98 inches diameter acting as a falling sphere viscometer.
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