K-1831 Study on the Transition of the Natural Convection

Abstract

An experimental investigation was conducted on the transition region of natural convection along a vertical cylinder immersed in water. Temperature fluctuation in the thermal boundary layer was measured from the transition to the turbulent region by using a thermocouple. Frequency analysis for the output of thermocouple revels that, the temperature fluctuation at the beginning of transition has some frequency before its periodicity fades before long with increasing (Gr^*_x Pr)_e. Moreover, move of vortices from the transition region to the turbulent flow is also noticed.