Enunciado
FenTrans, MecFlu, TransCal e TransMassa - Frank White - Mecânica dos Fluidos- Ed: 6º - Capítulo 7.Problemas - Ex. 52
Clift et al. [46] forneceram a fórmula para o arrasto de um esferoide prolato em um escoamento muito lento (creeping flow), como mostra a Figura P7.52. A semiespessura b é 4 mm. Se o fluido é óleo SAE 50W a 20°C, (a) verifique se e (b) estime o comprimento do esferoide para um arrasto de 0,02 N.
Passo 1
Bora lá, resolver mais umazinha!
Para o óleo SAE 50W temos e , assim, Reynolds
Logo, cumprimos (a)!
Passo 2
Bora utilizar a expressão dada para tentar estimar o tamanho desses esferoide, assim:
Assim, o comprimento do esferoide é dada por:
Resposta
- 0,030 m
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