Resumo

BORRAJO PEREZA, Rubén; ITITZO YANAGIHARAB, Jurandir  e  GONZALEZ BAYON, Juan José. An experimental study of heat transfer enhancement using vortex generators in a finned elliptical tube. Energética [online]. 2016, vol.37, n.3, pp. 165-175. ISSN 1815-5901.

In the recent years some papers have dealt with heat exchangers with non-circulartube geometry and vortex generators. Parametric studies with vortex generatorsapplied on heat exchangers models are necessary. The present work consistsof an experimental investigation about the influence of combining a plate-finned ellipticaltube with vortex generators mounted on the fin surface. The objective is to search for thebest position to place the vortex generators just considering heat transferenhancement. The experimental technique for Nusseltnumber determination was the naphthalene sublimation and mass transfer analogy. A visualization was implemented spreading wetted chalk on fin surface, as a color sensitive evaporation material. The better positionobtained is usefulfor future investigations involving heat exchanger formed by a higher number of tube rows. Additionally was studied the influence of Reynolds numberand angle of attack on the average Nusselt number

Palavras-chave : vortex generators; compact heat exchanger; elliptical tube; naphthalene.

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