Boiling strengthening surface with non-uniform wettability nanometer concave cavity structure and preparation method thereof

The invention discloses a boiling strengthening surface with a non-uniform wettability nanometer concave cavity structure and a preparation method of the boiling strengthening surface, and relates to the technical field of nanometer structure strengthening heat and mass transfer. A plurality of nanometer concave cavity structures are constructed on the surface of a heat transfer substrate in a certain arrangement mode, each nanometer concave cavity structure is composed of a side wall and a bottom wall, the side walls and the bottom walls have different wettability, and specifically, the wettability is three-dimensional non-uniform wettability that the bottom walls are hydrophobic and the side walls are hydrophilic. The initial nucleation time of bubbles on the surface of the non-uniform wetting nano concave cavity structure with the hydrophobic bottom wall and the hydrophilic side wall is earliest, the boiling initial temperature is lowest, and the structure has obviously more excellent nucleation boiling he