Intensification of heat transfer during spinodal decomposition of a superheated aqueous oligomer solution

D V Volosnikov,M G Vasin,A A Igolnikov,L D Son,P V Skripov,I I Povolotskiy

doi:10.1088/1742-6596/1787/1/012032

Abstract

The heat conduction of an aqueous solution of polypropylene glycol in the region of stable and unstable states was studied by the method of pulse isothermal impact on a substance with a characteristic time of 100 ms. It has been shown that the short-term superheating of a homogeneous solution not only above the liquid-liquid equilibrium temperature (low critical solution temperature), but also above the diffusion spinodal is fundamentally possible. The negative character of the deviation of the heat conduction of a solution from the additive law calculated from the heat conduction of the pure components at a given temperature was revealed. The signs of manifestation of spinodal decomposition accompanied by a significant intensification of heat transfer were found.

Highlights

The relevance of studying heat transfer in an aqueous solution of polypropylene glycol, a typical solution with low critical solution temperature (LCST), is dictated by both research and practical interest
The beginning of complex heat transfer associated with sample micro-phase separation and convection
The experiments revealed the possibility of crossing the LCST line and the diffusion spinodal of an aqueous solution

Summary

Introduction

The relevance of studying heat transfer in an aqueous solution of polypropylene glycol, a typical solution with low critical solution temperature (LCST), is dictated by both research and practical interest. Diffusion and heat transfer processes during pulse heating outside the temperature region of the homogeneous existence of a solution often remain unexplored.

Objectives

Results

Conclusion