Hostname: page-component-586b7cd67f-2brh9 Total loading time: 0 Render date: 2024-11-29T13:46:13.981Z Has data issue: false hasContentIssue false
  • English
  • Français

Fluid Flow and Heat Transfer in Duct Fan Flows with Top-Wall Rectangular-Wing Turbulators

Published online by Cambridge University Press:  05 May 2011

T. Y. Chen  and
Y. H. Chen
T. Y. Chen*
Affiliation:
Department of Aerospace Engineering, Tamkang University, Taipei, Taiwan 25137, R.O.C.
Y. H. Chen*
Affiliation:
Department of Aerospace Engineering, Tamkang University, Taipei, Taiwan 25137, R.O.C.
*
*Professor
**Research Assistant
Get access

Abstract

Fluid flow and heat transfer in duct fan flows with a 90° rectangular-wing turbulator, mounted on the top duct wall, were experimentally studied and compared with the bottom-wall turbulator results. Threecomponent velocities were measured to characterize the flow structures and to obtain near-wall flow parameters. Temperatures on heat transfer surfaces were measured to obtain Nusselt number distributions. Results show that the turbulator has the effect to increase the near-wall axial mean velocity, axial vorticity and turbulent kinetic energy, and, consequently, augment the heat transfer. The axial mean velocity and axial vorticity play an influential role on the heat transfer distributions for the flows across the top-wall and bottom-wall turbulators, respectively.

Keywords

Fan flowTurbulatorConvective heat transfer.
Type
Technical Note
Information
Journal of Mechanics , Volume 24 , Issue 2 , June 2008 , pp. N15 - N19
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2008

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1.Chen, T. Y. and Chen, Y. H., “Rectangular-Plate Turbulator Effects on Heat Transfer and Near-Wall Flow Characteristics in Fan Flows,” Journal of Mechanics, 20, pp. 33–41 (2004).Google Scholar
2.Eibeck, P. A. and Eaton, J. K., “Heat Transfer Effects of a Longitudinal Vortex Embedded in a Turbulent Boundary Layer,” Journal of Heat and Mass Transfer, 109, pp. 16–24 (1987).Google Scholar
3.Tiggelbeck, S., Mitra, N. and Fiebig, M., “Comparison of Wing-Type Vortex Generators for Heat Transfer Enhancement in Channel Flows,” Journal of Heat Transfer, 116, pp. 880–885 (1994).Google Scholar
4.Biswas, G., Torii, K., Fujii, D. and Nishino, K., “Numerical and Experimental Determination of Flow Structure and Heat Transfer Effects of Longitudinal Vortices in a Channel Flow,” International Journal of Heat and Mass Transfer, 39, pp. 3441–3451 (1996).CrossRefGoogle Scholar
5.Ligrani, P. M., Mahmood, J. L., Harrison, C. M., Clayton, D. L. and Nelson, D. L., “Flow Structure and Local Nusselt Number Variations in a Channel with Dimples and Protrusions on Opposite Walls,” International Journal of Heat and Mass Transfer, 44, pp. 4413–4425(2001).Google Scholar
6.Carvajal-Mariscal, I., Sanchez-Silva, F., Toledo-Velazquez, M. and Pronin, V. A., “Experimental Study on the Local Convective Efficient Distribution on a Pipe Surface with Inclined Fins,” Experimental Thermal and Fluid Science, 25, pp. 293–299 (2001).Google Scholar
7.Chen, T. Y. and Shu, H. T., “Flow Structures and Heat Transfer Characteristics in Fan Flows with and without Delta-Wing Vortex Generators,” Experimental Thermal and Fluid Science, 28, pp. 273–282 (2004).Google Scholar
8.Chen, T. Y. and Suen, M. J., “Turbulator Effects on Heat Transfer in Fan-Driven Flows,” Journal of Thermophysics, 18, pp. 413–415 (2004).Google Scholar
9.Moffat, R. J., “Describing the Uncertainties in Experimental Results,” Experimental Thermal and Fluid Science, 1, pp. 3–17 (1988).Google Scholar