HERIOT WATT UNIVERSITY SCHOOL OF ENGINEERING AND PHYSICAL SCIENCES DEGREE OF BENG IN MECHANICAL ENGINEERING First Year Mechanical Engineering Science 3 ??day ?? June 2007 ??:?? – ??:?? Answer TWO questions from each section A & B. Section A Q1. a) For a Newtonian fluid state an expression for the shear stress. [4 marks] b) An ice hockey puck traverses the ice on a thin sheet of water. A puck struck by an ice hockey player Initially travels
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A heat detector is a fire alarm device designed to respond when the convected thermal energy of a fire increases the temperature of a heat sensitive element. The thermal mass and conductivity of the element regulate the rate flow of heat into the element. All heat detectors have this thermal lag. Heat detectors have two main classifications of operation‚ "rate-of-rise" and "fixed temperature." |Contents | |
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infancy‚ much like the plastic industry was in the 30 ’s and 50 ’s‚ the potential uses of these are quite significant. In 1958‚ polyacetylene was first synthesised by Natta et al. as a black powder. This was found to be a semi-conductor with a conductivity between 7 x 10-11 to 7 x 10-3 Sm-1‚ depending upon how the polymer was processed and manipulated. This compound remained a scientific curiosity until 1967‚ when a postgraduate student of Hideki Shirakawa at the Tokyo Institute of Technology was
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for any other material. These cylindrical carbon molecules have unusual properties‚ which are valuable for nanotechnology‚ electronics‚ optics and other fields of materials science and technology. In particular‚ owing to their extraordinary thermal conductivity and mechanical and electrical properties‚ carbon nanotubes find applications as additives to various structural materials. For instance‚ in (primarily carbon fiber) baseball bats‚ car parts and even golf clubs [2]‚ where nanotubes form only
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0. Gau R. Viskanta Fellow ASME Heat Transfer Laboratory‚ Scool of Mechanical Engineering‚ Purdue University‚ West Lafayette‚ IN 47907 citing and Solidification of a Pure Metal on a Vertical Wall This paper reports on the role of natural convection on solid-liquid interface motion and heat transfer during melting and solidification of a pure metal {gallium) on a vertical wall. The measurements of the position of the phase-change boundary as well as of temperature distributions and temperature
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CHAPTER 1 INTRODUCTION Power transformers are very important in the electrical power sector; they are among the expensive assets of power generation and distribution systems. . According to Piush Verma [16]‚ transformers are static electromagnetic devices consisting of two or more windings which are linked with a common magnetic field used for the distribution of electrical power from one voltage level to another. Some of the main parts of the transformer are; the windings‚ tank and insulation
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Copper has been used in cookware because of its good thermal conductivity. In Eastern and Western cooking traditions‚ copper cookware sets were popular because they provided the best conductivity‚ and therefore the most even heating and cooking. Copper pots and pans were a staple of the colonial kitchen and have withstood the test of time to remain popular in the professional and home kitchen alike. Copper cookware sets will typically include a saut� pan‚ frying pan and a sauce pan. These are essential
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Physics 215 Winter 2002 Introduction to Modern Physics Prof. Ioan Kosztin Lecture #23 Solid State Physics • Bonding in solids (metals‚ isolators‚ semiconductors) • Classical free electron theory of metals • Quantum theory of metals • Band theory of solids • Semiconductors • Lasers Classification of solids • Phases of matter: • solid (well defined shape and volume) • liquid (only well defined volume) • gas (no defined shape or volume) • plasma (an overall neutral collection of charged
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ATTENTION: The Singapore Copyright Act applies to the use of this document. Nanyang Technological University Library AE1001 NANYANG TECHNOLOGICAL UNIVERSITY SEMESTER 1 EXAMINATION 2009-2010 AE1001 – DISCOVERY COURSE I November/December 2009 Time Allowed: 2½ hours Seat Number: Matriculation Number: INSTRUCTIONS 1. This paper contains FIVE (5) questions and comprises NINE (9) pages. 2. Answer ALL questions. Support your answers with formulae and figures whenever appropriate. 3. Write the
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ELECTRIC DISCHARGE MACHINING INTRODUCTION * Sometimes it is referred to as spark machining‚ * Its a manufacturing process whereby a desired shape is obtained using electrical discharges (sparks). * Material is removed from the workpiece by a series of rapidly recurring current discharges between two electrodes‚ separated by a dielectric liquid and subject to an electric voltage. * One of the electrodes – ‘tool-electrode’ or ‘tool’ or ‘electrode’. * Other electrode - workpiece-electrode
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