Ql:: A 11 in diamcter of pipes and 14 in long slides along a large diameter cylinder at a speed of 0.5 ft/s under the application of a force of 25 N in the inverse direction of its motion due to a film of oil between the cylinder and pipe. If the viscosity of oil 5 stokes and s.g 0.9, find the thickness of oil and the diameter of cylinder.

5.4 A liquid, density 801 kg/m³ and viscosity 1.49 cp, is flowing in a horizontal pipe at a velocity of 4.5 m/s. If the diameter of a steel pipe is 2½ in, and its length is 65 m (a) Calculate the friction losses (b) Calculate the friction losses if the pipe is considered as a smooth pipe. Determine the percentage decrease in friction losses.

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A plate 0.05mm distance from a fixed plate moves at 1.25 m/s and required a force per unit area of 3 Pa to maintain this speed by using an oil of specific gravity 0.65. Find the dynamic viscosity in centipoise and kinematic viscosity in stokes of the fluid between the plates. Calculate the specific weight in kN/m³, density, and the specific gravity of a liquid having a volume of 662900 cm and weight of 55 kN

A cylindrical machine part moves within a surrounding cylinder. The centrelines of the part and the surrounding cylinder are coincident. The cylinder is full of an oil (viscosity 0.25kg/ms) that is not flowing i.e. no pressure gradient is applied. What is the value of the viscous force exerted on the machine part as it moves along the cylinder at a speed of 9m/s? • The machine part is 0.06m long and has a radius of 0.041m. • The ratio of the machine part radius to the cylinder radius is 0.98. • Assume that the flow is dominated by viscous forces. • Give your answer as an absolute value i.e. no negative sign, in Newtons to one decimal place.

Carbon dioxide at 125 °C flows over a flat plate at 0.4 m/s. If we use 3.5 x 105 as the critical Reynolds number, what will be the distance along the plate that you can expect the flow to remain laminar? What is the distance if you use the range of values given by my fluid’s textbook (Cengal and Cimbala) of 1 x 105 for ideal situations to 5 x 105 for typical engineering situations?

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A pump is used in a building to lift water from a ground floor. The pump is pushing 60l/sec of water through a 0.1m diameter to above floor which is 5m high If the average velocity in the pipe is 6m/s. what will major energy loss if the dynamic viscosity of water is 8.9 x 10-4s. Due to vibration and noise issue in a pipe the velocity of pump is decided to set at 2.5 m/s. What will new major energy? Calculate the minor energy loss if length of the pipe is 15m. use f = 0.03,  = 1,  = 0.9 Analyse the relationship between frictional energy loss under different gravitational flow conditions

6. A hydraulic lift (see below) of the type commonly used for greasing automobiles consists of a 280.00 mm diameter ram which slides in a 280.18 mm-diameter cylinder, the annular space being filled with oil film of thickness t = 0.09 mm, having a viscosity 0.3612 kg/(m s). If the rate of travel of the ram is v= 0.22 m/s, find the frictional resistance when 2 m of the ram is engaged in the cylinder. Take the weight of ram as 500 N. Ram Oil film -Fixed cylinder