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|Article Title & Authors (Volume 12, Issue 4, August - 2019)
|Exact Two-Dimensional Rectangular Fin Solution Versus Improved Classical One-Dimensional Radial Fin with Application in Electrical Engine
International Journal of Advances in Engineering & Technology (IJAET), Volume 12 Issue 4, pp. 51-66, August 2019.
Extended surfaces are widely used in engineering applications for greater efficiency in heat transfer rate. Indeed, extended surfaces are of great importance in the design of heat exchange devices in different fields of application in order to provide an improved heat transfer effect through an increase in the total heat exchange area. Among the various possible applications in engineer, the design of cooling systems for electronic devices with extended surfaces, such as in modern computers, requires highly optimized configurations, predictive and precise mathematical analyses. Exact analytical solution of two-dimensional, steady-state heat conduction in an extending rectangular surface is presented. A polynomial interpolation was developed for Modified Bessel Functions, in all ranges of applicability. In addition, the improved classic one-dimensional model for radial fins is critically examined for this type of profile. The influence of governing parameters, Biot number and aspect ratio, is investigated and comparison is made in relation of results of literature. Results for efficiency and effectiveness, depending on the Biot number and aspect ratio as a parameter, are presented. Applications for extended surfaces in electric motors are also analyzed, because of their vital importance in the industry since they are extensively used in machines of all types.
|925 Silver and 18k Gold Electroplated Jewelry: A Comparative Analysis of Environmental Impacts
Schwab, Felipe; Jacques, Jocelise J.; Oliveira, Branca F.
International Journal of Advances in Engineering & Technology (IJAET), Volume 12 Issue 4, pp. 67-79, August 2019.
Decisions about materials and production processes are very important to designers, manufacturers and users, due to not only product aesthetics or durability but also to environmental impact, which is a new requirement that begins to have more influence on purchasing decisions. To satisfy environmentally conscious consumers it is necessary for designers and companies to consider and disclose information regarding choice of materials and processes. Companies need to rethink how this information reaches consumers and also the way in which consumers have access to data about the impact of their purchasing decisions. This paper presents a comparison between pieces of jewelry: two identical models of scapulars, one in silver and the other in brass plated with 18k gold - identifying the production processes that differentiate them and presenting the specific impacts that the choice of materials can entail. It considers the main stages of production and maintenance requirements of the products throughout their lifetime, based on informational and photographic surveys applied in a company that manufactures the scapulars. Based on the analysis of each production process, a qualitative point-by-point comparison was performed, including price, environmental impact in production, environmental impact on maintenance and disposal, possible return of the material to the production cycle and cost-benefit. The results allow the discussion of environmental and health issues, as well as certain consumer behaviors, providing an in-depth comparison about similar products.
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