Required for annealing process using lumped system analysis

Assignment Help Mechanical Engineering

Reference no: EM13714091

A long steel bar of radius R = 2.5 cm, k =50 W/(m .°C), p = 7800 kg/m3, and c = 0.5 kJ/(kg. .°C) is to be annealed by cooling slowly from 800.°C to 100.Â°C in an environment at temperature 50.°C. If the heat transfer coefficient between the environment and the surface of the bars is h = 45 W/(m .°C), determine the time required for the annealing process using lumped system analysis

Reference no: EM13714091

Questions Cloud

Determine the isentropic efficiency of this turbine : Air is expanded from 1.5MPa and 177°C to 90kPa in an adiabatic turbine. Determine the isentropic efficiency of this turbine if the air is exhausted at 0°C

Steam power plant operates between the pressure limits : A steam power plant operates between the pressure limits of 4.5MPa and 15kPa. Steam enters the pump as saturated liquid and leaves the turbine as saturated vapor. Determine the ratio of the work delivered by the turbine to the work consumed by the pu..

Ocean thermal energy conversion power plant : An Ocean Thermal Energy Conversion (OTEC) power plant built in Hawaii in 1987 was designed to operate between the temperature limits of 86°F at the ocean surface and 41°F at a depth of 2100 ft.

Required for annealing process using lumped system analysis : A long steel bar of radius R = 2.5 cm, k =50 W/(m .°C), p = 7800 kg/m3, and c = 0.5 kJ/(kg. .°C) is to be annealed by cooling slowly from 800.°C to 100.Â°C in an environment at temperature 50.°C. If the heat transfer coefficient between the environme..

Fluid flow axially in annular region between two concentric : A fluid flow axially in the annular region between two concentric pipes with radii R1 and R2>R1, respectively. Assume the flow is steady, incompressible, axisymmetric, fully-developed, and has no swirl. Also neglect all body forces.

Assume that the tunnel operates adiabatically : A hypersonic gun tunnel is used to generate short-duration, high-speed flows and typically consists of two cylindrical volumes separated by a diaphragm. One end of the tunnel (the driver end) is pumped to a high pressure, while the other end (the dri..

Pressure-angle helical pinion with a right-hand helix : A 17-tooth 20 normal pressure-angle helical pinion with a right-hand helix angle of 30 rotates at 1800 rev/min when transmitting 4 hp to a 52-tooth helical gear. The normal diametrical pitch is 10 teeth/in, the face width is 1.5 in, and the set has a..

User Account

All Pages