You are asked to measure the viscosity of an emulsion, so you use a tube flow viscometer, with the container open to the atmosphere. The length of the tube is 10 cm, its diameter is 2mm, and the diameter of the container is 3 in. When the level of the sample is 10 cm above the bottom of the container the emulsion drains through the tube at a rate of 12 cm^3/min, and when the level is 20 cm the flow rate is 30cm^3/min. the emulsion density if 1.3g/cm^3.
Find the viscosity of the emulsion?
What would the sample viscosity be at a shear rate of 500s^-1