To determine the viscosity of a liquid of specific gravity 0.95, you fill to a depth of 12 cm a large container that drains through a 30 cm long vertical tube attached to the bottom. The tube diameter is 2 mm, and the rate of draining is found to be 1.9 cm3 /s. What is the fluid viscosity (assume laminar flow)

Fluid viscosity,

Explanation:

Container depth, D = 12 cm = 0.12 m

Tube length, l = 30 cm = 0.3 m

Specific Gravity, = 0.95

Tube diameter, d = 2 mm = 0.002 m

Rate of flow, Q = 1.9 cm³/s = 1.9 * 10⁻⁶ m³/s

Calculate the velocity at point 2 ( check the diagram attached)

Rate of flow at section 2,

Applying the Bernoulli (energy flow) equation between Point 1 and point 2 to calculate the head loss:

For laminar flow, the head loss is given by the formula:

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