A capillary-tube viscometer is being selected to measure viscosity of a liquid food. The maximum viscosity to be measured will be 230 cP, and the maximum flow rate that can be measured accurately is 0.015 kg/min. If the tube length is 10 cm and a maximum pressure of 25 Pa can be measured, determine the tube diameter to be used. The density of the product is 1000 kg/m3.

The diameter to be used is 0.98 cm

Explanation:

The Poiseuille´s law is equal to:

Where

Q = flow rate = 0.015 kg/min = 2.5x10⁻⁷m³/s

P = pressure difference = 25 Pa

r = radius

η = viscosity = 230 cP = 0.23 Pa s

L = length of the tube = 10 cm = 0.1 m

Clearing r:

The diameter is:

answer:

explanation:

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