Experimental study of hydrodynamics and heat transfer of impact jet with chevrons

Abstract

Using modern panoramic optical measurement methods, a comprehensive experimental study of the flow structure and heat transfer in a submerged impact jet with and without chevrons was carried out. A detailed study of the influence of the presence of a flat athwart-oriented surface on the structure of the chevron jet flow on convective heat transfer was carried out. In the case of a jet with chevrons, the velocity values at the surface are shown to exceed the values of the standard round jet, and the pulsations are more intense and more uniform near the impact surface, which, accordingly, affects the heat transfer on the target. The increment in the average intensity of heat transfer of the chevron jet reaches 24%, compared with the round jet. The reason for the increment in the heat transfer coefficient is due to an increase in the number of chevrons.