下端加熱型二相熱サイフォンの加熱面温度変動と流動特性

概要

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An experiment on heat transfer characteristics in a two-phase thermosyphon was carried out at atmospheric pressure employing water as an operating substance for an adiabatic pipe of inner diameter D_p=2 to 8mm and of length L=500 and 1000mm. A heated surface temperature starts fluctuating, because of unstable vapor-liquid counter flow at a heat flux. Heat flux, q_f, at the onset of the heated surface temperature fluctuation has been measured in the two-phase thermosyphon of which the bottom is heated. A feature of bubbles at the upper end of the adiabatic pipe was photographed and was related to the temperature fluctuation, and the effect of D_p and L on q_f was clarified. The characteristics of the temperature fluctuation of the heated surface and flow in the pipe were also discussed. The heat flux at the onset of the temperature fluctuation can be predicted by the Wallis equation with C_w=0.7 for 3≦D_p≦8mm.
久留米工業大学の論文
2002-12-20