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A cold air chamber is proposed for quenching steel ball bearings of diameter D = 0.2 m and initial temperature Ti = 400°C. Air in the chamber is maintained at - 15°C by a refrigeration system, and the steel bans pass through the chamber on a conveyor belt. Optimum bearing production requires that 70% of the initial thermal energy content of the ban above - 15°C be removed. Radiation effects may be neglected, and the convection heat transfer coefficient within the chamber is 1000 W/m2 · K. Estimate the residence time of the balls within the chamber, and recommends a drive velocity of the conveyor. The following properties may be used for the steel: k = 50 W/m · K, a = 2 X 10-5 m2/s, and c = 450 J/kg · K.
a gas contained in a cylinder goes through 2 processes in series. first from 1 to 2 is constant pressure compression 50
a 10 degree wedge is to be forced under end b of the 5 kg rod ab. knowing that the coefficient of static friction is
plastics and other polymeric materials are expensive with respect to steel and are usually more costly than aluminum
Write a program using nested for (or any) loop to create a 3×5 matrix in which the value of each element is its row number to the power of its column number divided by the sum of its row number and column number. For example, the value of element (2,..
1. Define pyrolysis in its most general sense. 2. Pyrolysis products include solids, liquids, and non-condensable gases. Provide a high level summary of the chemical composition of each of these products.
The aim of this project is to determine the maximum Junction temperature of 2 Silicon Carbide transistors within a microelectronics assembly
water at inlet 1 to a heat exchanger enters the heat exchanger through a circular pipe at a temperature of 200 oc a
Jacky Brown, a maintenance manager of a local plant in reviewing the maintenance records of production equipment, has compiled the following maintenance cost data: 5 years ago $500; 4 years ago $ 600; 3 years ago $700; 2 years ago $800; and Last year..
assuming the engine above is a 3.7 liter v-6 operating at 7000 rpm determine the followingvtdc and vbdc per
a bar of aluminum is subjected to a tensile load of 15000 lbs. if the bar is 0.35 inches in diameter and 20 inches long
A rotating saw blade has 48 teeth and 4 slots. If the room where the saw is used is illuminated with a pulsed light source, at what pulse frequencies will a) the saw blade teeth appear to be stationary? b) The blade slots appear stationary? c) Will t..
two fixed horizontal parallel plates are spaced 0.2 inches apart. a viscous liquid mu8x10-3 lb sft2 sg0.9 flows between
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