Heat Transfer Enhancement in Turbulent Flows by Blocked Surfaces

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In this study, the heat transfer analyses over flat and blocked surfaces were carried out in turbulent flow under the influence of the block height. A constant-temperature hot wire anemometer was used to the velocity and turbulent intensity measurements, while temperature values were measured by copper-constantan thermocouples. The average Stanton numbers for block heights of 15 and 25 mm were higher than those of flat surface by %38 and %84, respectively. The results showed that the presence of the blocks increased the heat transfer and the enhancement rose with block heights


Blocked surface, Turbulent flow, Heat transfer enhancement

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Bilen, K. ve Yapıcı, S. (2001) Heat transfer form a surface fitted with rectangular blocks at different orientation angle, Heat and Mass transfer, 38, 649-655.

Chen, Y.M. ve Wang, K.C. (1998) Experimental study on the forced convective flow in a channel with heated blocks in tandem, Experimental Thermal and Fluid Science, 16, 286- 298.

Kays, W.M. ve Crawford, M.E. (1993) Convective heat and mass transfer, New York: McGraw Hill.

Kim, S.H. ve Anand, N.K. (1994) Turbulent heat transfer between a series of parallel plates with surface-mounted discrete heat sources, Journal of Heat Transfer, 116, 577-587.

Kline, S.J. ve McClintock, F.A. (1953) Describing uncertainties in single sample experiments, Mech. Eng., 75, 3-8.

Korichi, A. ve Oufer, L. (2006) Heat transfer enhancement in oscillatory flow in channel with periodically upper and lower walls mounted obstacles, International Journal of Heat and Fluid Flow, 52, 1138-1148.

Lee, C.K., Abdel-Moneim, S.A. (2001) Computational analysis of heat transfer in turbulent flow past a horizontal surface with two-dimensional ribs, International Communication Heat and Mass Transfer, 28, 161-170.

Leung, C.W., Kang H.J. ve Probert, S.D. (1997) Horizontal simulated printed-circuit board assembly in fully-developed laminar-flow convection, Applied Energy, 56, 71-91.

Mohammed, M.M. (2006) Air cooling characteristics of a uniform square modules array for electronic device heat sink, Applied Thermal Engineering, 26, 486–493.

Morris, G.K. ve Garimella, S.V. (1996) Thermal wake downstream of a three-dimensional obstacle, Experimental Thermal and Fluid Science. 12, 65-74.

Naik, S., Probert, S.D. ve Bryden, I.G. (1999) Heat transfer characteristics of shrouded longitudinal ribs in turbulent forced convection, International Journal of Heat and Fluid Flow, 20, 374-384.

Perng, S-W ve Wu, H-W. (2008) Numerical investigation of mixed convective heat transfer for unsteady turbulent flow over heated blocks in a horizontal channel, International Journal of Thermal Sciences, 47, 620-632.

Ryu, D.N., Choi, D.H. ve Patel, V.C. (2007) Analysis of turbulent flow in channels roughened by two-dimensional ribs and three-dimensional blocks, Part II: Heat transfer, International Journal of Heat and Fluid Flow, 28, 1112-1124.

Sara, O.N., Pekdemir T., Yapıcı S. ve Yılmaz M. (2001) Enhancement of heat transfer from a flat surface in a channel flow by attachment of rectangular blocks, International Journal of Energy Research, 25, 563-576.

Tsay, Y.-L. ve Cheng, J.-C. (2008) Analysis of convective heat transfer characteristics for a channel containing short multi-boards mounted with heat generating blocks, International Journal of Heat and Mass Transfer, 51, 145–154.

Young, T.J. ve Vafai, K. (1998) Convective flow and heat transfer in a channel containing multiple heated obstacles, International Journal of Heat and Mass Transfer, 41, 3279-3298.

Makale 19.06.2012 tarihinde alınmış, 19.11.2012 tarihinde düzeltilmiş, 21.11.2012 tarihinde kabul edilmiştir.

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