Cooling of a laser-modified surface with a dispersed flow of coolant

The paper deals with the study of heat transfer intensification during cooling of a surface treated by laser with a dispersed coolant flow. A laser ablation technique using a pulsed laser is described; this treatment leads to the formation of craters of up to 600 µm in diameter on a copper surface with the following roughness parameters: R a = 1.48 µm, R z = 9.8 µm. The results demonstrate an increase in the removed heat flux by 35–40 %, the heat transfer coefficient by 38–55 % at intense boiling (115–125 °C) compared to the unmodified surface. The proportion of heat removed due to the phase transition reaches 90 % at a removed heat flux density of 8.4 MW/m 2 on the modified surface.