Heat Transfer of Modified Surfaces with Dispersed Coolant Flow

The authors conducted a study of the cooling of modified surfaces by a dispersed coolant flow. Surface modification was carried out by three different methods: structure knurling, electron beam, and hole drilling. Three series of experiments were carried out for each of the surfaces at different coolant parameters. The excess pressure of the coolant at the nozzle inlet was
$(1.5-3.5)\cdot 10^{5}$
Pa), the mass flow rate of the coolant (distilled water) was
$(4.0-6.0)\cdot 10^{-3}$
kg/s, the irrigation density varied within
$(4.2-6.2) \text{kg}/(\mathrm{m}^{2}\cdot \mathrm{s})$
. The dependences of the heat flux density and the heat transfer coefficient were compared for both modified and unmodified surfaces. For the calculated thermophysical quantities, the corresponding graphic dependences were obtained.