Abstract
The paper presents experimental results of boiling heat transfer of distilled water and ethyl alcohol on surfaces covered with single layers of wire mesh structures made of phosphor bronze and copper. For each material two kinds of structures have been considered (higher and lower) in order to determine the impact of the height of the structure on boiling heat transfer. The wire diameter of the copper meshes was 0,25 mm and 0,32 mm, while of the bronze meshes: 0,20 mm and 0,25 mm. The structures had the same mesh aperture (distance between the wires – 0,50 mm for copper and 0,40 for bronze) but different wire diameter and, consequently, different height of the layers. The tests have been performed under ambient pressure in the pool boiling mode. The obtained results indicate a visible impact of the layer height on the boiling heat transfer performance of the analysed microstructures.
Highlights
Boiling heat transfer is highly efficient in dissipating large heat fluxes at small temperature differences
The presented tests have been performed with distilled water and ethyl alcohol as working fluids on the surfaces covered with single layers of phosphor bronze and copper mesh layers
The impact of the height of the porous layer on boiling heat transfer of distilled water has been shown in Figure 2 for the copper meshes and in Figure 3 for the phosphor bronze meshes
Summary
Boiling heat transfer is highly efficient in dissipating large heat fluxes at small temperature differences. In order to further intensify the heat exchange process some additional coatings might be applied on smooth heaters. These coatings enable to dissipate much higher heat fluxes than those of smooth surfaces – one of the most useful and practical covering is the metal mesh microstructure. The boiling process is initiated at lower temperature differences, which is an additional advantage.
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