Cooling of a modified laser surface treatment with a dispersed flow of coolant
V.S. Shteling, A.T. Komov, P.P. Shcherbakov, A.V. Zakharchenkov, A.S. Filakov
Moscow Power Engineering Institute (MPEI), Moscow, Russia
Keywords: heat and mass transfer, dispersed flow, spray cooling, heat flux, phase transition, experimental study, modified surface
Abstract
The article studies the intensification of heat transfer during cooling of a surface modified by laser treatment with a dispersed coolant flow. A laser ablation technique using a pulsed laser is described, leading to the formation of craters up to 600 μm in diameter on a copper surface with the following roughness parameters: Ra = 1.48 μm, Rz = 9.8 μm. The results show an increase in the removed heat flux by 35-40%, the heat transfer coefficient by 38-55% in the intense boiling mode (115-125 °C) compared to the unmodified surface. The proportion of heat removed due to the phase transition reaches 90% at a removed heat flux density of 8.4 MW/m2, on the modified surface.
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