Question

Please solve the following problem. Present your results in the form of a neat and organized report. Note that this project will add a bonus of 10 points to your overall score, with the restriction that the total score for the course cannot exceed 100 points. 1. Heating of a Slurry in a Hollow Tube A closed tube or pipe contains a slurry both of whom are initially at room temperature T-25 °C. At time 0, the tube is suddenly immersed completely in an oil bath maintained at a temperature To-200°C. The following data are available: (100 points) Mass of tube or pipe, mp-300 g Mass of slurry inside tube, m, = 20 g Outer surface area of tube, Ao-80 cm2 Inner surface area of tube, Ai-70 cm2 Heat capacity of tube, op- 0.5 J/(g °C) Heat capacity of slurry, c 4J/(gc) Outside heat transfer coefficient, ho-0.05 W/ (cm2 oc) Inside heat transfer coefficient, -0.04 W/(cm2oc) The transient temperatures of the tube T, and slurry T, are governed by the following two heat balances: d7 dT prepare a plot of the transient temperatures T, and 7, as a finction of Solve the equations and time f.

Answer 1

A bearing is a machine element that constrains relative motion to only the desired motion, and reduces friction between moving parts. The design of the bearing may, for example, provide for free linear movement of the moving part or for free rotation around a fixed axis; or, it may prevent a motion by controlling the vectors of normal forces that bear on the moving parts. Most bearings facilitate the desired motion by minimizing friction. Bearings are classified broadly according to the type of operation, the motions allowed, or to the directions of the loads (forces) applied to the parts.

Rotary bearings hold rotating components such as shafts or axles within mechanical systems, and transfer axial and radial loads from the source of the load to the structure supporting it. The simplest form of bearing, the plain bearing, consists of a shaft rotating in a hole. Lubrication is often used to reduce friction. In the ball bearing and roller bearing, to prevent sliding friction, rolling elements such as rollers or balls with a circular cross-section are located between the races or journals of the bearing assembly. A wide variety of bearing designs exists to allow the demands of the application to be correctly met for maximum efficiency, reliability, durability and performance.

The term "bearing" is derived from the verb "to bear";[1] a bearing being a machine element that allows one part to bear (i.e., to support) another. The simplest bearings are bearing surfaces, cut or formed into a part, with varying degrees of control over the form, size, roughness and location of the surface. Other bearings are separate devices installed into a machine or machine part. The most sophisticated bearings for the most demanding applications are very precise devices; their manufacture requires some of the highest standards of current technology