Flow and heat transfer characteristics over rectangular blocked surfaces


Umur H. , Yemenici O., Umur Y. , Sakin A.

EXPERIMENTAL HEAT TRANSFER, vol.30, no.3, pp.192-204, 2017 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 30 Issue: 3
  • Publication Date: 2017
  • Doi Number: 10.1080/08916152.2016.1233146
  • Title of Journal : EXPERIMENTAL HEAT TRANSFER
  • Page Numbers: pp.192-204
  • Keywords: blocked surface, turbulent intensity, heat transfer, flow separation, TURBULENT-FLOW, 3-DIMENSIONAL BLOCKS, 2-DIMENSIONAL RIBS, CONVECTIVE FLOW, PARALLEL PLATES, CHANNEL, ENHANCEMENT, OBSTACLES

Abstract

Heat transfer and flow measurements were recorded over blocked surfaces to investigate the effects of flow velocity and block shape on flow separation and heat transfer. The results indicated that the flow separation occurred particularly on the first block and after the last blocks. The flow separation and block thickness resulted in higher turbulence and heat transfer, particularly in laminar flow. The average Stanton number increased as high as 125% in laminar, 80% in transitional, and 50% in turbulent flows above those of flat plate values. A new empirical equation indicated a good agreement with the experimental and numerical results.