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Investigação experimental do permutador de calor de tubos de alhetas em espiral
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ISBN10: 6209252753
ISBN13: 9786209252754
Publisher: Edicoes Nosso Conhecimento
Published: Nov 10 2025
Pages: 56
Weight: 0.19
Height: 0.13 Width: 6.00 Depth: 9.00
Language: Portuguese
ISBN13: 9786209252754
Publisher: Edicoes Nosso Conhecimento
Published: Nov 10 2025
Pages: 56
Weight: 0.19
Height: 0.13 Width: 6.00 Depth: 9.00
Language: Portuguese
Neste livro, o permutador de calor foi testado com diferentes espessuras de alheta e espessura do tubo de alumÃnio. A geometria da alheta, a condutividade térmica do material, a condição de fronteira na ponta da alheta e o coeficiente de transferência de calor (h) na superfÃcie da alheta afectam a eficácia de uma alheta baseada em compósito. A transferência de calor por convecção forçada foi calculada utilizando uma peça de teste de alumÃnio com espessuras de aleta à base de compósito de 0,5, 0,6 e 0,7 mm e passos de aleta de 4,23 e 6,35 mm. Os resultados mostram que um espaçamento de 4,23 mm optimiza a transferência de calor, indicando que mais alhetas são mais eficazes. O fator de Colburn (j) foi calculado para a convecção forçada numa amostra de alumÃnio com espessuras de alhetas helicoidais de 0,5, 0,6 e 0,7 mm e passos de alhetas à base de compósito de 4,23 e 6,35 mm. Os resultados do ensaio mostram que o fator de Colburn (j) raramente é afetado pelo passo das alhetas à base de compósito. Foi utilizado um provete de alumÃnio com espessuras helicoidais de alhetas à base de compósito de 0,5 mm, 0,6 mm e 0,7 mm com passos de alheta à base de compósito de 4,23 mm e 6,35 mm para calcular o coeficiente de atrito para convecção forçada. A eficácia da transferência de calor foi aumentada com a utilização deste método.
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