PENGUJIAN PERPINDAHAN PANAS KONVEKSI ALAMI SEBAGAI FUNGSI SUDUT PADA PLAT DATAR MUKA PANAS MENGHADAP KE BAWAH DENGAN TEMPERATUR PERMUKAAN PLAT DIJAGA KONSTAN

Abstract

In the real world, there are still much application that based on natural convection heat transfer principle pecifically for its cooling flow. In the electrics technique field, transmission channel, transformator, current rectifier, and strand of metal that heated with electrics like filament fluorescant lamp or element of electrics oven heater still use natural convection for its cooling flow. The purpose of this research is to know the value of natural convection heat transfer coefficient for flat plate as variety angle function with heat surface down and to compare coefficient value theoretically with experimental result, therefore we made a testing tool that based on natural convection heat transfer at flat plate that was heated from bottom direction using heater, then given axis at one side so plate position can be arranged in accordance with desired inclination angle. The result of this research in several testing are obtained with different inclination angle and different constant plate surface temperature at 350 C, 500 C, 700 C, and 1000 C. The highest value of natural convection heat transfer coefficient is 17,46 W/m2 0C, which is obtained at 1000 C with angle 00 and the lowest value is 9,87 W/m2 0C, which is obtained at 350 C with angle 900. Keyword : convection heat transfer coefficient, heat transfer flow