Non-Stationary Heat Transfer Beyond Diffusion Spinodal of a Solution

In recent years, problems connected with the enhancement of heat transfer have come to the forefront of thermophysical research. One of the current approaches to this problem consists in the search for partially-soluble additives to the liquid heat carrier combined with an optimisation of the thermal conditions in which these additives provide a significant effect. In this report, the thermal response characteristics of a solution of water and polypropylene glycol (PPG-425), having a lower critical solution temperature (LCST), used to facilitate powerful heat dissipation, are discussed. The method of controlled pulse heating of a wire probe was applied. An analysis of the energy values transferred from the probe to the solution in a particular heat release mode showed that, for a solution with 20-30% content of PPG, these values exceed the corresponding values for pure water by an order of magnitude. This result can serve as a basis for the search of a new generation of coolants for processes in which powerful heat generation is possible.