Comparação de aletas de geratrizes não-lineares com aletas piniformes

Abstract

Extended surfaces, as known as fins, are very important objects for industries during heat transfer and thermal exchange processes. These devices are used in various equipment such as heat exchangers, boilers, pipes and various other typical equipment of the chemical and food industry. However, as heat dissipation through fins calculus involve multiples differential equations, it's better used conventional-form fins that are easier to project like piniform, areolar and flat one. Because of those mathematical difficulties, industrial equipment loses a lot of geometries that can be more effective than conventional-geometry fins. For that reason, this work’s objective is to develop a detailed study that provides heat dissipation data for any point of fins that have many geometric forms, comparing these data to those obtained with piniform fins. In this way it’s possible to prove which form of fin is the best for each process in particular by comparing obtained answers and we can find capable alternatives to minimize operational costs of companies. The most notable fin due to the increase in heat dissipation was the sinusoidal fin of the increasing straight section area, increasing the heat dissipation by 52.8% when compared to the dissipation achieved by the piniform fin. However, there is a 333.6% increase in volume when compared to the piniform fin, which would result in a significant increase in production costs. In contrast, the quadratic fin with increasing straight section, which increased the dissipation by 34% compared to the heat dissipation of the piniform fin, also compared to the piniform fin, had an increase of only 14.1% in volume. Therefore, its production costs are far away from the cost of piniform fin.