Heat transfer of a modified surface with a dispersed coolant flow

Abstract

The authors carried out a modification of the surface of the working section of the experimental stand, which simulates the energy-loaded elements of thermonuclear installations. The surface was modified by the knurling method, as a result of which structures with a characteristic size of 250 μm were obtained. An experimental study of the heat transfer of a modified surface with a dispersed coolant flow was carried out. The excess pressure of the coolant at the nozzle inlet was (1.5–3.5) × 105 Pa), the mass flow rate of the coolant (distilled water) was (3.9–6.1)×10-3 kg/s, irrigation density varied within (4.2–6.2) kg/(m2·s), initial temperature of the coolant 25.8–26.4 °C. As a result, experimental dependences of the heat flux density and heat transfer coefficient on the temperature of the cooled wall were obtained. The results obtained on the modified surface were compared with the results obtained on the surface without modified structures under similar operating parameters of the coolant.