Liquid-liquid phase separation heat transfer in advanced micro structure

•An experimental study of using Triethylamine (TEA)/water solution along with advanced micro structure is presented.•Such mixture and structure combination enables heat removal of at least 500 W/cm2 at mass flux of 600 kg/m2s, while the heated surface temperature is below 80 °C.•Various geometrical structures and flow conditions are tested to provide a complete understanding of the heat transfer process.•The results are useful to help design micro heat sink with advanced structures.•Customer-defined dimensionless parameters are used to characterize the phase separating convection heat transfer process.•Computational fluid dynamics (CFD) tool is used to provide additional physical insights.