Natural convection heat transfer coefficients for a horizontal cylinder with vertically attached circular fins |
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| Affiliation: | 1. University of Applied Science and Technology (UAST)-Mohandesan Center, Mashhad, Iran;2. Young Researchers and Elite Club, Neyshabur Branch, Islamic Azad University, Neyshabur, Iran;3. Department of Mechanical Engineering, Babol University of Technology, Babol, Iran;1. Section Transport Phenomena, Department of Chemical Engineering, Faculty of Applied Sciences, Delft University of Technology, Delft, Van der Maasweg 9, 2629HZ, Netherlands;2. J. M. Burgerscentre for Fluid Mechanics;3. Laboratory for Aero and Hydrodynamics, Delft University of Technology |
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| Abstract: | Experiments were performed to investigate the natural convection heat transfer characteristics of a vertically finned horizontal isothermal cylinder. The apparatus was designed so that the fin spacing, fin length, and the cylinder Rayleigh number could be varied within limits of practical interest. The Rayleigh number (based on the cylinder diameter) ranged from 105 to 5 × 107. It was found that the interaction of the fin boundary layer with the cylinder brought about a reduction of the cylinder Nusselt number relative to that for the classical case of the long isolated horizontal cylinder. The reduction was strong at Rayleigh numbers below the critical value and at spacing ratios less than 0.125. However, at Rayleigh numbers beyond the critical, the Nusselt number was quite insensitive to the fin spacing and length, with the typical data spread being in the 5–8% range. |
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