Q2. Density and viscosity of a natural emulsion composed of 85% (by volume) water and 15% (by volume) of oil is 990 kg/m³ at 25°C and its viscosity is 1.8 cP. At this temperature density and viscosity...

Extracted text: Q2. Density and viscosity of a natural emulsion composed of 85% (by volume) water and 15% (by volume) of oil is 990 kg/m³ at 25°C and its viscosity is 1.8 cP. At this temperature density and viscosity of water are 1000 kg/m³ and 1 cP, respectively. Diameter of spherical oil droplets is 50 µm. a) Calculate density of oil droplets and then terminal velocity of oil droplets by deciding the flow regime. b) What can you say about the flow direction of the oil droplets? Show the flow direction and forces effective on the oil droplet by drawing an oil. c) At which time the emulsion is completely deformed (or separated into oil and water phases) if 200 liter emulsion exists in a cylindrical tank of which diameter is equal to the height of the emulsion? (Hint: Consider oil droplets as solid particles)