JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II Year FLUID MECHANICS Previous Question Paper (September/October - 2023 - R13)

What is the effect of pressure and temperature on viscosity?

Define atmospheric pressure, gauge pressure, vacuum pressure and absolute pressure.

Difference between the stream line, path line and streak line.

Write assumptions of continuity equations.

What is coefficient of discharge for venturimeter and orificemeter?

Derive the Euler's equation of motion.

What is the reason for boundary layer separation and write the prevention of it.

At what conditions boundary layers separation occurs?

What is the practical application of Moody’s Chart?

Define the laminar and turbulent flow into the pipe.

If the velocity profile of a fluid over a plate is parabolic with free stream velocity of 120 cm/sec occurring at 20 cm from the plate, calculate the velocity gradient and shear stress at a distance of 0, 10, and 20 cm from the plate. Take the viscosity of fluid as 8.5 poise.

Figure 1 shows a rectangular plane surface (3m deep and 2m wide) makes 30 deg angle with the free surface. Calculate the centre of pressure and total pressure when the upper edge is 1.5m below the free surface.

Figure 2 illustrates a tainter gate of 4 m radius. Calculate the vertical and horizontal pressure components on the face of gate of 90 deg sector. Assume the gate width as unity.

Figure 3 shows a gate, which supports water. Calculate the height h of the water so that the gate tips about the hinge, if the gate width is unity.

Derive the equation of continuity for one, two, three dimensional flows.

Explain velocity potential and stream functions in details.

What is flownet and discuss its advantages?

What is rotational and irrotational flows?

Derive an expression of discharge for orificemeter.

Write five differences between notch and weir.

In a smooth pipe of uniform diameter 25 cm, a pressure of 50kPa was observed at section 1 which was at elevation 10 m. At another section 2 at elevation 12 m the pressure was 20 kPa and velocity was 1.25 m/s. Determine the direction of the flow and headloss between these two sections. The fluid in the pipe is water.

A pitot tube is inserted in a pipe of 30 cm diameter. The static pressure of the tube is 10 cm of mercury, vacuum. The stagnation pressure at the centre of the pipe recorded by pitot tube is 1 N/cm2. Calculate the rate of flow of water through the pipe, if the mean velocity of flow is 0.85 times the central velocity. Assume coefficient of tube to be 0.98.

Derive approximate solutions of Navier Stoke’s Equations.

Find the value of shape factor for a linear distribution of velocity in boundary layer on flat plate.

Oil having a viscosity of 0.08kg/ms flows through 100 mm dia pipe. The laminar flow velocity distribution u(r) is given by u = 1.4 [1-(r/R)2]. i) Determine the shear stress at the ordinate. ii) Calculate the pressure drop for 1 m length of pipe.

Oil of absolute viscosity 1.5 poise and relative density 0.85 flows through a 30 cm dia pipe. If the head loss in 300 m length of pipe is 20 m, estimate i) the shear stress at the pipe wall. ii) shear stress at a radial distance of 10 cm from pipe axis. The friction factor by assuming the flow to be laminar.

A large tank shown in figure 4 has a vertical pipe 70 cm long and 2 cm in dia. The tank contains an oil of density 920 kg/m3 and 1.5 poise. Find the discharge through the tube when the height of oil level of the tank is 0.80 m above the pipe inlet.

A smooth surface pipe of 0.2 m in dia. transports crude oil at a speed of 2.5 m/s. Categorized the type of flow. Determine the head loss of in 100 m and the power required to maintain the flow. Take relative density 0.90 and kinematic viscosity = 40cm2/s.