Features of cavitation initiated on a laser heating element near a solid flat surface

The effect of a flat solid boundary on the dynamics of a cavitation steam bubble arising from the boiling of water with subcooling on a laser heating element, accompanied by the generation of jets, is investigated. The boiling of water is caused by the absorption of continuous laser radiation with a wavelength of $\lambda$ = 1.47 $\mu$m in the vicinity of the tip of an optical fiber immersed in water. Using high-speed video filming, it is established that the presence of a solid flat surface near the laser heating element (the tip of the optical fiber) leads to a rotation of the generated jet towards the surface, forming an angle between the direction of jet propagation and the plane of the surface. This angle determines the degree of impact of the jet front on the flat boundary and depends on the distance from the tip of the optical fiber to the boundary – a flat solid surface.