2成分相変化材の凝固過程 : 種々のパラメータが凝固形態に及ぼす影響

抄録

Experiments for solidification have been conducted using aqueous ammonium chloride (NH₄Cl-H₂O) as a binary mixture. Effects of the initial concentration and the initial superheat of the solution, the orientation and the temperature of a cold surface, and attached brass plates to the cold surface on the solidification process have been systematically examined from observations of timewise variation of the solidification morphology and from measurement of temperature distributions. It has been shown that these parameters considerably affect the strength of the thermal driven and/or solutal driven buoyancy flows, and the solidification morphology largely changes with the variations in the parameters. In particular, the effect of the orientation of the cold surface is significant, and various solidification morphologies appear with the variation in the orientation.