Heat Transfer Under Pulse Heating of Liquids: The Case of Solution with Lower Critical Solution Temperature

摘要

Heat transfer enhancement problems had come to the forefront of thermophysical research. One of theapproaches to this problem consists in the search for partially soluble additives to the liquid heat carrier andoptimising the thermal conditions in which these additives provide a significant effect. In this report, thepeculiarities of a thermal response of a solution of water and polypropylene glycol (PPG-425), having LCST,to powerful heat release are discussed. The method of controlled pulse heating of a wire probe was applied.An analysis of the values of the energy transferred from the probe to the substance has shown that thesevalues for a solution with 20-30% content of PPG exceed the corresponding values for pure water by anorder of magnitude. This result can serve as a basis for the search of a new generation of coolants forprocesses in which powerful heat generation is possible.