Question

Question (a) Sulphuric acid is flowing through a pipe (2.5 inch diameter, 50 ft length) in a velocity of 0.006 m2/s. The sulphuric acid has a viscosity of 25 mN.s/m² and density of 1680 kg/m² while the roughness of the pipe surface is 1.3 mm. If the operating temperature is 290K, determine fluid flow (i.e. laminar, turbulent or others). (Given that 1 m= 39.37 inch) (b) Define pump, suction head, impelling head and the total head of a pump. (c) Following Q2(b), justify the importance of understanding the four items mentioned above.

Answer 1

2 2 a) Cross sectional area of pipe = 49087 nd? V Tx (2.5) = 4,9081 in 134_3? j ? = 4.9087 = 0.00317 M m2 (39.3732 iength - 50 ft Velocity = 0.006 3 0.00317 82 1.893 m/s 15.24 m. = pud 1680 X1.893 X 15.24 4 = 25 NON.s/m2. Reynold number M 25x10-25*10B 25 X10 3 6 = 1,938,674 .304 -1.938 4:0 The flow is turbulent.

b) pump which Pressure converts mechanical A pump is a machine energy energy into bydraulic energy wide varrety of punops designed for specific applicators Most of them are enod broadly classified into the displatensent pump centrifugal parop. there are Varuous Free between the center of Suction head It is the vertical height oferthe Surface of the liquid in sump the pumpp. and Impeller head between differensee and Suction head Head at the inspeller is the sums of to Suction Suction pressure Loss Teretter Pressure at impeller: Suction pressure Pst Suction As Suction loss Р. IHS

Total Head ant The sans of the buction head Total static saction static difference betwoers discharge head and the Friction head. differens ce between discharge head. head is the and Total static Head sah static discharge head static Suctor I Head are mainly used head Insportants of the pump Purops Provide wide range of applications. They for tromsfering Flund from one phase to another. They be also can be used to induce flow. suction Head Suction Head analyses cantaton. By meassuring can determine net positive available, we Suction a givers point to flashing Thorbay canchation Quanded bay Inspelled Head should try to maintains the pressure at impelly more than vapour pressure of The panspooning liquid, to avad the cavitation. Pressure at inspeller > fluid at is the how close we log The Vapour pressure of liquid.

Total Head pensp :3 Total head of The The accurate size based on the inportant to determine and scale of pumping cauipment requirement.