Ashok Sapkota

Ashok Sapkota is a dedicated engineer currently serving at the Department of Water Resources and Irrigation in Nepal. With a strong educational background, Ashok completed his Bachelor's degree from the Institute of Engineering (IOE), Pulchowk Campus, Nepal. He is currently pursuing a Master's degree in Construction Management at the same prestigious institution.

Ashok's professional expertise lies in water resources and irrigation engineering, where he applies his knowledge to contribute to Nepal's water management and agricultural development.

Beyond his professional commitments, Ashok is passionate about sharing his engineering insights. He regularly writes blogs on various engineering topics, aiming to educate and inspire others in the field.

With a combination of practical experience, ongoing advanced education, and a drive to share knowledge, Ashok Sapkota represents the new generation of engineers working to shape Nepal's future.

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 »

The velocity distribution of a viscous liquid (dynamic viscosity = 9 Poise) flowing over a fixed plate is given by u = 0.85y – y2 (u is velocity in m/s and y is the distance from the plate in m). What are the shear stresses at the plate surface and at y=0.3 m?

Shear Stress Calculations Problem Statement The velocity distribution of a viscous liquid (dynamic viscosity = 9 Poise) flowing over a

The velocity distribution of a viscous liquid (dynamic viscosity = 9 Poise) flowing over a fixed plate is given by u = 0.85y – y2 (u is velocity in m/s and y is the distance from the plate in m). What are the shear stresses at the plate surface and at y=0.3 m? Read More »

In a fluid the velocity measured at a distance of 75mm from the boundary is 1.125m/s. The fluid has absolute viscosity 0.048 NS/m2 and relative density 0.9. What is the velocity gradient and shear stress at the boundary assuming a linear velocity distribution. Also calculate kinematic viscosity.

Fluid Properties Calculations Problem Statement In a fluid the velocity measured at a distance of 75mm from the boundary is

In a fluid the velocity measured at a distance of 75mm from the boundary is 1.125m/s. The fluid has absolute viscosity 0.048 NS/m2 and relative density 0.9. What is the velocity gradient and shear stress at the boundary assuming a linear velocity distribution. Also calculate kinematic viscosity. Read More »

The surface tension of mercury and water at 60°C are 0.47 N/m and 0.0662 N/m respectively. What capillary height change will occur in these two fluids when they are in contact with air in a glass tube of radius 0.30mm? Use θ = 130° for mercury and 0° for water.

Capillary Height Calculations Problem Statement The surface tension of mercury and water at 60°C are 0.47 N/m and 0.0662 N/m

The surface tension of mercury and water at 60°C are 0.47 N/m and 0.0662 N/m respectively. What capillary height change will occur in these two fluids when they are in contact with air in a glass tube of radius 0.30mm? Use θ = 130° for mercury and 0° for water. Read More »

At a depth of 7.5km in the ocean, the pressure is 75Mpa. Assume a specific weight at the surface of 10 KN/m2 and an average bulk modulus of elasticity of 2.5 Gpa for that pressure range. Find (a) the change in specific volume between the surface and 7.5km (b) the specific volume at 7.5km and (c) the specific weight at 7.5km.

Ocean Pressure Calculations Problem Statement At a depth of 7.5km in the ocean, the pressure is 75MPa. Assume a specific

At a depth of 7.5km in the ocean, the pressure is 75Mpa. Assume a specific weight at the surface of 10 KN/m2 and an average bulk modulus of elasticity of 2.5 Gpa for that pressure range. Find (a) the change in specific volume between the surface and 7.5km (b) the specific volume at 7.5km and (c) the specific weight at 7.5km. Read More »

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