1. Water (Density = 1000 kg/m3, Dynamic viscosity = 0.001 Pa.s) flows through a pipe of 15 cm diameter. Volume flow rate of the fluid is 0.015 m3/s. Average height of surface roughness of the pipe is 0.03 mm. Determine the pressure drop due to friction for 1000 m length of the pipe. 2.Analyse the effect on pressure drop if the length of the pipe is increased for the system given in Question1

4a

Q2/: As shown in the figure, the Assumptions of the flow through the venturi is steady, incompressible, irrational with negligible frictional effects , the effect of air column on the pressure change is negligible, the pressure can be assumed to be uniform at a given cross-section of the venturi meter and the flow is horizontal . Air is flowing through a venturi meter whose diameter is 2.6 in at the entrance part (location 1) and 1.8 in at the throat (location 2). The gage pressure is measured to be 12.2 psia at the entrance and 11.8 psia at the throat. Neglecting frictional effects, take the air density to be 0.075 lbm/ft. 1. Show that the volume flow rate can be expressed as: 2(P P2) | = A, p(1 – AŽIA}) 2. Find the flow rate of the air? 12.2 psia 11.8 psia Air 2.6 in 1.8 in

Oil (density = 842 kg/m³ and kinematic viscosity = 6.2e - 4 m²/s) is being discharged by a 66 mm diameter, 3 m long horizontal pipe from a storage tank open to atmosphere. The height of the liquid above the centre of pipe is 1 m. Disregarding the minor losses, determine (to 4 decimal places): a) the volumetric flow rate of the oil through the pipe m³/s b) the corresponding Re number.