Abstract
The heat transfer of natural convection from upward-facing horizontal heated surface with a heated cylindrical pipe is investigated experimentally. The purpose of this study is to determine the relationships of the heat transfer from the horizontal heater to flow characteristics around the heated cylinder. In the case of no flow reversal and flow reversal occurred in the heated cylinder, the heat transfer showed the same tendency and increased with increasing the heat flux of the cylindrical heater. On the other hand, when flow reversal reached to the horizontal heater, the heat transfer decreased with increasing the temperature in the cylindrical heater.
