Find the minimum allowable cooling time in the water

Assignment Help Mechanical Engineering

Reference no: EM13712316

Ball bearings of plain carbon steel are to be hardened by quenching them in a water bath at a temperature of 37^oC. You are asked to devise a continuous process in which the ball could roll from a soaking oven at a uniform temperature of 870^oC into the water, where a rubber conveyor belt carries them away. The rubber conveyor belt, however, would not be satisfactory if the surface temperature of the balls leaving the water is above 90^oC. If the convective coefficient is equal to 590 W/m2.K, (a) find the minimum allowable cooling time in the water for balls up to 1.0 cm in diameter, (b) calculate the total amount of heat to be removed from the water bath in order to maintain a uniform temperature if 100,000 balls are to be quenched per hour.

Reference no: EM13712316

Questions Cloud

What is the rate of heat transfer from the balls to the oil : Steel balls at 150°C with a specific heat of 0.50 kJ/kg.°C are quenched in an oil bath to an average temperature of 70°C at a rate of 15 balls per minute. If the average mass of steel balls is 1.2 kg, what is the rate of heat transfer from the balls ..

Determine the mach number at the exit : Nitrogen flows through a converging-diverging nozzle designed to operate at a Mach number of 3.0. It it is subjected to an operating pressure ratio of 0.5: Determine the Mach number at the exit.

Explain what metrics should be used to assess : Identify some of the logistics activities that the business engages in and explain what metrics should be used to assess how effective the logistics function is that would be important to customers.

Consider a sealed can that is filled with refrigerant : A 0.2-m3 rigid tank contains 8 kg of water (in any phase or phases) at 500 kPa. What is the temperature in the tank? Consider a sealed can that is filled with refrigerant-134a at 20°C. Now a leak develops, and the pressure in the can drops to the loc..

Find the minimum allowable cooling time in the water : Ball bearings of plain carbon steel are to be hardened by quenching them in a water bath at a temperature of 37oC. You are asked to devise a continuous process in which the ball could roll from a soaking oven at a uniform temperature of 870oC into th..

First select one of the tcos of the course. : 1. (TCO All) For the next set of questions , you will first select ONE of the TCOs of the course. Then, you will be asked to write an essay about the project you worked on this term over your two companies' change program based on the TCO you ..

Explain the logic of why each criterion should be important : Describe and list at least 8 specific criteria to use and explain the logic of why each criterion should be important.

In a two dimensional flow over a solid plate : In a two dimensional flow over a solid plate, the x component of the velocity varies linearly from zero at the plate surface to 2 m's at y = 5 cm. The y component of velocity is zero everywhere i.e. it is a parallel flow over a flat plate. Obtain an ..

Understanding the data movement at cho manufacturing : Sue Kong, the systems analyst, has made significant progress in understanding the data movement at Cho Manufacturing. To share what she has done with other members of her team as well as the head of regional operations, she is composing a data..

User Account

All Pages