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DOI: 10.1615/ICHMT.2009.CONV.1140
10 pages

Robert Pastuszko
Chair of Heat Engines, Kielce University of Technology, Al. Tysiaclecia P.P. 7, 25-314 Kielce, Poland


Experimental investigations of pool boiling heat transfer on micro-fin arrays covered with porous structure were conducted. Experimental data were discussed for two kinds of enhanced surface: micro-fin ctructure without covering and micro-fins with the copper wire net (mesh structure). The experiments were carried out for water and fluorient FC-72 at atmospheric pressure. The wire net with mesh aperture of 0.32 and 0.5 mm (wire diametr 0.2 mm and 0.32 mm respectively), sintered with the mini-fin tips, formed a system of connected perpendicular horizontal tunnels. Tunnel width was 0.6 - 1.0 - 1.5 mm and its depth was 0.5 mm. Rather essential enhancement of heat transfer coefficient was observed for the surface with sintered wire net, especially for low and medium heat fluxes. At high heat fluxes (above 150 kW/m2 for water anf 30 kW/m2 for FC-72) surfaces with micro-fins without the porous structure showed the highest heat transfer coefficient.

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