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A NUMERICAL STUDY OF THE EFFECT OF SPACED TRIANGULAR SURFACE WAVES ON NATURAL CONVECTIVE HEAT TRANSFER FROM AN UPWARD FACING HEATED HORIZONTAL ISOTHERMAL SURFACE

Patrick H. Oosthuizen
Department of Mechanical and Materials Engineering, Queen's University, 130 Stuart Street, Kingston, ON, K7L 3N6, Canada

Abdulrahim Kalendar
Mechanical Power and Refrigeration Department, College of Technological Studies, PAAET; College of Tech. Studies, Public Authority for Applied Education and Training, Shuwaikh-24758, Kuwait

DOI: 10.1615/TFEC2020.fnd.032195
pages 377-390

要約

The use of surface waviness to increase the natural convective heat transfer rate from horizontal surfaces has been extensively investigated and the use of waves with a triangular cross-sectional shape has received significant attention. These studies of the use of triangular shaped waves indicated that the waves do not always produce as significant an increase in the heat transfer rate as anticipated. Most existing studies of the effect of triangular surface waves on the heat transfer rate considered arrangements involving continuous waves, i.e., each wave started where the preceding wave ended However, it may be possible that triangular surface waves would be more effective in increasing the heat transfer rate if they were spaced, i.e., if there was a flat section between each pair of waves. This has been numerically investigated in the present study. Natural convective heat transfer from a horizontal upward facing isothermal heated surface imbedded in a surrounding adiabatic surface has been considered. The heated surface was covered with a series of parallel triangular surface waves running longitudinally along the surface with a space between each pair of waves. Conditions under which laminar, transitional, and turbulent flows exist have been considered. The solution has been obtained using ANSYS FLUENT©. Results have been obtained for a Prandtl number of 0.74. The results indicate that using spaced waves produces a higher heat transfer rate than exists with non-spaced waves.

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