Análise experimental e computacional da transferência de calor de um dissipador de calor
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A dissipação adequada da energia térmica de um sistema é sempre um requisito para muitos equipamentos e indústrias. Qualquer dispositivo que funcione com uma fonte de energia externa gera sempre calor. O calor gerado em tais sistemas deve ser expelido para o ambiente circundante. A maximização da área de superfície dos dispositivos aumenta geralmente a taxa de arrefecimento. No entanto, torna o sistema volumoso. Por conseguinte, a utilização correcta da área de superfície do sistema é um parâmetro importante para obter um sistema de dissipação de calor eficiente. Sempre foi desejável ter um dissipador de calor em todos os dispositivos que ocupasse o mínimo de espaço com a máxima eficácia. O presente trabalho analisa a física da transferência de calor conjugada num sistema 3-D de alhetas de alumínio, com ar como fluido de trabalho. Foi utilizado um solucionador de volumes finitos, ANSYS Fluent, para simular um arranjo escalonado de alhetas colocado sobre uma placa de base. O calculador é validado utilizando os dados experimentais. A análise térmica foi efectuada em alhetas com várias secções transversais. São consideradas as alhetas com secções transversais circulares, hexagonais, pentagonais, triangulares e em forma de gota com várias velocidades de entrada.
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