Oil of density 950 kg/m and viscosity 102 Ns/m2 is to be pumped 10 km through a pipeline and the pressure drop must not exceed 2x10$ N/m2. What is the minimum diameter of pipe, which will be suitable, if a flowrate of 50 ton/h is to be maintained? Assume the pipe wall to be smooth. Use either a pipe friction chart or the Blasius equation f= 0.079/ Re4. Ans. d = 0.193 m 111

Water is stored in a tank sketched in the figure below to support the demand of a nearby community area.The system is designed so that pressure at the location B always lies in the range of 330 to 440 kPa (gauge).Water demand fluctuates between 0.3 and 1 m3/s regardless of pressure at B. The supply pipe of 600 mmdiameter and 1 km length between A and B is made of steel and has the equivalent sand roughness of 1 mm.Although not shown in the figure, the supply pipe has five 90◦ bends, each having the head loss coefficientof 0.8. The figure shows that the bottom end of the tank is located 42 m above the ground, and the pipe isburied 1.5 m below the ground. A pump system regulates so that the tank keeps the same water level all thetime. Assume water at 20◦C, and air in the storage tank has the atmospheric pressure. To meet the designcriterion for pressure at B, what should be the depth of water h in the storage tank?

A smooth square cylinder is put in 15 °C  flowing water. The flow direction is perpendicular to the long axis of the cylinder (parallel to the square section). The edge length of the square is s=2.0m. The long axis length is L=5.0m.  The flow velocity is v=0.046 m/s.  The density of water is ρ=1000kg/m3.  T he dynamic viscosity is η=1.15×10-3kg/m·s. (3) Calculate the drag force FD_________N (2 decimal places)

A 200 mm long pipe slopes down at 1 in 100 and tapers from 0.25m diameter to 0.15 diameter at the lower end. If the pipe carries 100 litres of oil of specific gravity 0.85 find the pressure at the lower end. The upper end gauge reads 50 KPa.