Experimental study on the factors affecting supercooling of sodium sulfate decahydrate solution under variable temperature cooling

Abstract

Supercooling harms inorganic hydrated salts, which are phase transition materials. Three variables were chosen for the experiment in order to better understand the variables influencing the supercooling of sodium decahydrate sulfate solution: stirring rate, purity of sodium decahydrate sulfate, constant temperature cooling of the water bath, and variable temperature cooling of the water bath. The quantity of heat exchange was kept constant by controlling the heat exchange temperature differential with variable temperature cooling. The controlled variable approach was used to examine how the three factors affected the supercooling of sodium sulfate decahydrate. The findings indicated that all three variables had an impact on the level of supercooling. The supercooling of the three materials under constant temperature cooling does not change appreciably as the stirring rate rises. The difference in supercooling under variable temperature cooling is around 7 °C. Constant temperature cooling always produces more supercooling than variable temperature cooling. The difference in supercooling between the two cooling techniques when the stirring rate is 0 r/min, 250 r/min, and 500 r/min is about 2 °C, 6 °C, and 9 °C.