Numerical (Water)

A fluid of absolute viscosity of 0.045 Pa-s and sp gr of 0.91 flows over a flat plate. The velocity of fluid at 70mm height over the plate is 1.13m/s. Calculate the shear stress at the solid boundary and at points 20mm above the plate considering (a) linear velocity distribution, and (b) parabolic velocity distribution with vertex at point 70mm away from the surface.

Problem Statement A fluid with an absolute viscosity of 0.045 Pa-s and a specific gravity of 0.91 flows over a […]

A fluid of absolute viscosity of 0.045 Pa-s and sp gr of 0.91 flows over a flat plate. The velocity of fluid at 70mm height over the plate is 1.13m/s. Calculate the shear stress at the solid boundary and at points 20mm above the plate considering (a) linear velocity distribution, and (b) parabolic velocity distribution with vertex at point 70mm away from the surface. Read More »

Three cylindrical tubes of 0.5m length are placed co-axially and the central tube is rotated at 5 rpm applying a torque of 6 Nm. Determine the viscosity of oil which fills the space between tubes. Take r1, r2 and r3 as 0.15m, 0.152m and 0.154m.

Problem Statement Three cylindrical tubes of length 0.5m are placed coaxially. The central tube rotates at 5 rpm under a

Three cylindrical tubes of 0.5m length are placed co-axially and the central tube is rotated at 5 rpm applying a torque of 6 Nm. Determine the viscosity of oil which fills the space between tubes. Take r1, r2 and r3 as 0.15m, 0.152m and 0.154m. Read More »

The tip of a glass tube with an internal diameter of 2mm is immersed to a depth of 1.5cm into a liquid with a specific gravity of 0.85. Air is forced into the tube to form a spherical bubble just at the lower end of the tube. Estimate the surface tension of the liquid if the pressure in the bubble is 200Pa.

Problem Statement The tip of a glass tube with an internal diameter of 2mm is immersed to a depth of

The tip of a glass tube with an internal diameter of 2mm is immersed to a depth of 1.5cm into a liquid with a specific gravity of 0.85. Air is forced into the tube to form a spherical bubble just at the lower end of the tube. Estimate the surface tension of the liquid if the pressure in the bubble is 200Pa. Read More »

The surface tension of water in contact with air is 0.0725 N/m. The pressure outside the droplet of water with a diameter of 0.02 mm is atmospheric (1.032 × 105 N/m2). Calculate the pressure within the droplet of water.

Problem Statement The surface tension of water in contact with air is 0.0725 N/m. The pressure outside the droplet of

The surface tension of water in contact with air is 0.0725 N/m. The pressure outside the droplet of water with a diameter of 0.02 mm is atmospheric (1.032 × 105 N/m2). Calculate the pressure within the droplet of water. Read More »

A Newtonian fluid fills the gap between a shaft and a concentric sleeve. When a force of 780N is applied to the sleeve parallel to the shaft, the sleeve attains a speed of 2m/s. If a 1400N force is applied, what speed will the sleeve attain? The temperature of the sleeve remains constant.

Problem Statement A Newtonian fluid fills the gap between a shaft and a concentric sleeve. When a force of 780N

A Newtonian fluid fills the gap between a shaft and a concentric sleeve. When a force of 780N is applied to the sleeve parallel to the shaft, the sleeve attains a speed of 2m/s. If a 1400N force is applied, what speed will the sleeve attain? The temperature of the sleeve remains constant. Read More »

A flat plate 0.3m2 in area moves edgewise through oil between large fixed parallels 10cm apart. If the velocity of plate is 0.6m/s and the oil has a kinematic viscosity of 0.45 stokes and specific gravity 0.8, calculate the drag force when (i) the plate is 2.5cm from one of the planes and (ii) the plate is equidistant from both the planes.

Problem Statement A flat plate 0.3m2 in area moves edgewise through oil between large fixed parallels 10cm apart. If the

A flat plate 0.3m2 in area moves edgewise through oil between large fixed parallels 10cm apart. If the velocity of plate is 0.6m/s and the oil has a kinematic viscosity of 0.45 stokes and specific gravity 0.8, calculate the drag force when (i) the plate is 2.5cm from one of the planes and (ii) the plate is equidistant from both the planes. Read More »

A cylinder of 12cm radius rotates concentrically inside a fixed cylinder of 12.6cm radius. Both cylinders are 0.3m long. Determine the viscosity of the liquid that fills the space between the cylinders if a torque of 0.9 Nm is required to maintain an angular velocity of 60rpm.

Problem Statement A cylinder of 12cm radius rotates concentrically inside a fixed cylinder of 12.6cm radius. Both cylinders are 0.3m

A cylinder of 12cm radius rotates concentrically inside a fixed cylinder of 12.6cm radius. Both cylinders are 0.3m long. Determine the viscosity of the liquid that fills the space between the cylinders if a torque of 0.9 Nm is required to maintain an angular velocity of 60rpm. Read More »

A shaft 75mm in diameter is fixed axially and rotated inside a sleeve of diameter 75.2mm at 200rpm. The length of the shaft is 200mm. Determine the resisting torque exerted by the oil and the power required to rotate the shaft. The viscosity of oil is 5 NS/m2.

Problem Statement A shaft 75mm in diameter is fixed axially and rotated inside a sleeve of diameter 75.2mm at 200rpm.

A shaft 75mm in diameter is fixed axially and rotated inside a sleeve of diameter 75.2mm at 200rpm. The length of the shaft is 200mm. Determine the resisting torque exerted by the oil and the power required to rotate the shaft. The viscosity of oil is 5 NS/m2. Read More »

A shaft 70mm in diameter is being pushed at a speed of 0.4m/s through a bearing sleeve 70.2mm in diameter and 250mm long. The clearance, assumed uniform, is filled with oil of kinematic viscosity 0.005 m2/s and specific gravity 0.9. Find the force exerted by the oil on the shaft.

Problem Statement A shaft 70mm in diameter is being pushed at a speed of 0.4m/s through a bearing sleeve 70.2mm

A shaft 70mm in diameter is being pushed at a speed of 0.4m/s through a bearing sleeve 70.2mm in diameter and 250mm long. The clearance, assumed uniform, is filled with oil of kinematic viscosity 0.005 m2/s and specific gravity 0.9. Find the force exerted by the oil on the shaft. Read More »

A square block weighing 1.15KN and 250mm on an edge slides down an incline on a film of oil 6µm thick. Assuming a linear velocity profile in the oil, calculate the terminal speed of the block. The viscosity of the oil is 0.007 NS/m2.

Problem Statement A square block weighing 1.15KN and 250mm on an edge slides down an incline on a film of

A square block weighing 1.15KN and 250mm on an edge slides down an incline on a film of oil 6µm thick. Assuming a linear velocity profile in the oil, calculate the terminal speed of the block. The viscosity of the oil is 0.007 NS/m2. Read More »

A piston of weight 90N slides in a lubricated pipe. The clearance between piston and pipe is 0.025mm. If the piston decelerates at 0.6m/s2 when the speed is 0.5m/s, what is the viscosity of the oil?

Problem Statement A piston of weight 90N slides in a lubricated pipe. The clearance between piston and pipe is 0.025mm.

A piston of weight 90N slides in a lubricated pipe. The clearance between piston and pipe is 0.025mm. If the piston decelerates at 0.6m/s2 when the speed is 0.5m/s, what is the viscosity of the oil? Read More »

A piston is moving through a cylinder at a speed of 5.7m/s. The film of oil separating the piston from the cylinder has a viscosity of 0.95 Ns/m2. What is the force required to maintain this motion?

124.7mm 125mm 75mm 5.7 m/s Piston Force Calculation Problem Statement A piston is moving through a cylinder at a speed

A piston is moving through a cylinder at a speed of 5.7m/s. The film of oil separating the piston from the cylinder has a viscosity of 0.95 Ns/m2. What is the force required to maintain this motion? Read More »

Scroll to Top