This project aims to recover very low-temperature waste heat (< 60°C) by combining a temperature-responsive water + ionic liquid mixture, which undergoes liquid-liquid phase separation above a critical temperature, with electricity production through an osmotic process, in collaboration with L. Bocquet (LPENS) and Emmanuel Benichou (ILM). While the proof of concept of this process is already demonstrated, many fundamental questions remain to be addressed. One of these is understanding the liquid-liquid phase separation dynamics of the binary solution, which undergoes separation above a critical temperature when subjected to an external flow, exhibiting complex flow patterns. The subsequent PhD thesis will involve fundamental studies on these flows performed in microfluidics experiments, combining experimental and modeling approaches. The funding of the PhD is secured.