Cooling of a structured high temperature surface with a dispersed flow

Abstract

The authors have conducted an investigation into the cooling of five distinct types of structured surfaces by means of a dispersed flow of distilled water. The modification of the heat transfer surface of the copper working section was conducted using a variety of methods, including mechanical processing and electron beam treatment at different parameters. Macrophotographs of the structured surface were obtained and their profiles were subsequently measured using a profilometer. Two series of experiments were conducted for each surface, with different coolant parameters. The excess pressure of the coolant at the nozzle inlet was in the range of 1.5 to 3.5 × 10⁵ Pa, the mass flow rate of the coolant (distilled water) was in the range of 4.0 to 6.1 × 10−3 kg/s, and the irrigation density varied within the range of 4.2 to 6.2 kg/(m2·s). The relationships between heat flux and heat transfer coefficient were compared for both modified and unmodified surfaces. The calculated thermophysical quantities were also represented graphically.