This study proposed a radial heat sink with a surrounding
structure as a cooling system for light-emitting diode (LED)
lighting with a circular base. The radial heat sink with long and
middle fins was considered. Heat flow and radiative heat
transfer were simulated numerically and the numerical model
was validated experimentally. Natural convection heat transfer
at the heat sink can be improved by controlling the air flow
pattern. In this study, the surrounding structure increased the
velocity of the inlet air around the heat sink due to the narrow
air inlet surface, allowing the cooling air to move to the center
of the heat sink. The effects of the material used to make the
surrounding structure and the surface treatment of the heat sink
were also analyzed. The results showed that the thermal
efficiency of the radial heat sink was improved by up to 40%
following installation of the chimney-shaped surrounding
structure. The material used to make the surrounding structure
did not influence the ability of the heat sink to dissipate heat.
This research is expected to be helpful in the development of
high-power LED lighting with a natural cooling system.
Papers presented to the 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Costa de Sol, Spain on 11-13 July 2016.