...(1) (Welty, Rorrer, Foster, 6th Edition International Student Version 16.2) It is desired to transport liquid metal through a pipe embedded in a wall at a point where the temperature is 650K. A 1.2-m thick wall constructed of a material having thermal conductivity varying with temperature according to , where T is in K and k is in W/m.K, has its inside surface maintained at 925 K. The outside surface is exposed to air at 300 K with a convective heat transfer coefficient of 23 W/m2.K. How far from the hot surface should the pipe be located. What is the heat flux for the wall? (2) WWWR 17.13 A 2.5-cm-thick sheet of plastic (k = 2.42 W/m.K) is to be bonded to a 5-cm-thick aluminium plate. The glue that will accomplish the bonding is to be held at a temperature of 325K to achieve the best adherence, and the heat to accomplish this temperature is to be provided by a radiant source. The convective heat transfer coefficient on the surfaces of both the plastic and aluminium is 12 W/m2.K, and the surrounding air is at 295 K. What is the required heat flux if it is applied to the surface of (a) plastic? (b) aluminium? (3) (Modified from Welty, Rorrer, Foster, 6th Edition International Student Version 16.1) The steady state expression for heat conduction through a plane wall is . For steady state heat conduction through a hollow cylinder, an expression similar to the equation is Where is the log-mean are defined as a. Show that as defined above satisfies the equations for...
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...Autonomic Computing: An Overview Manish Parashar1 and Salim Hariri2 The Applied Software Systems Laboratory, Rutgers University, Piscataway NJ, USA 2 High Performance Distributed Computing Laboratory, University of Arizona, Tucson, AZ, USA parashar@caip.rutgers.edu, hariri@ece.arizona.edu 1 Abstract. The increasing scale complexity, heterogeneity and dynamism of networks, systems and applications have made our computational and information infrastructure brittle, unmanageable and insecure. This has necessitated the investigation of an alternate paradigm for system and application design, which is based on strategies used by biological systems to deal with similar challenges – a vision that has been referred to as autonomic computing. The overarching goal of autonomic computing is to realize computer and software systems and applications that can manage themselves in accordance with high-level guidance from humans. Meeting the grand challenges of autonomic computing requires scientific and technological advances in a wide variety of fields, as well as new software and system architectures that support the effective integration of the constituent technologies. This paper presents an introduction to autonomic computing, its challenges, and opportunities. 1 Introduction Advances in networking and computing technology and software tools have resulted in an explosive growth in networked applications and information services that cover all aspects of our life. These sophisticated...
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