Abstract
Wettability is one of the main characteristics of a surface and reflects the ability of a liquid to flow over a solid surface. Using hydrophobic functional surfaces in evaporator and condenser of heating plants to intensify heat exchange processes will increase efficiency and, consequently, reduce the metal consumption and weight-size parameters of this equipment. This will result in reduced energy consumption and lower production and operating costs. This paper presents an analysis of methods for creating hydrophobic surfaces. The fabrication of hydrophobic copper surface of experimental samples by creating multimodal relief in form of 50 µm grid by laser ablation process and subsequent reduction of surface energy of material using water emulsion of octadecylamine is grounded and described. The fluence was varied from 5 to 900 J/cm2 when modifying the surface using laser station. The dependence of the effect of laser fluence on water contact angle value is presented. Following the study, the optimum laser irradiation parameters for the surface of experimental samples were determined, at which the maximum value of water contact angle of 146.61° and the minimum value of roll-off angle of 13.5° were obtained.
Highlights
One of the strategic objectives in the energy industry is to improve the reliability and efficiency of heat exchange equipment in heating plants
During the treatment of experimental samples surfaces the laser fluence was varied in the range from 5 to 900 J/cm2, which corresponds to the following parameters: laser output power was 12, 20 W, rep rate was 20, 100 kHz, and scan speed varied in the range from 42 to 5555 mm/s
The modification of the experimental samples using laser ablation process and ODA aqueous emulsion resulted in all surfaces becoming hydrophobic and water contact angle ranging from 102.9 to 146.6 degrees
Summary
One of the strategic objectives in the energy industry is to improve the reliability and efficiency of heat exchange equipment in heating plants. The surface of the experimental sample was made hydrophobic by laser ablation process followed by coating with nanofluid (aqueous solution of SiO2 silicon dioxide), resulting in a water contact angle of 155-160°. In research work [5] a comparative analysis of heat transfer coefficient values in vertical plate heat exchangers made of brass 464 in the initial state and with PTFE-based hydrophobic coating was carried out.
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