Flow and heat transfer characteristics over rectangular blocked surfaces

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.

Keywords::

• blocked surface
• turbulent intensity
• heat transfer
• flow separation

Funding

The financial support for some parts of this project (OUAP M-2013/9), provided by the Scientific Research Fund of Uludag University, is gratefully acknowledged.