Structured capillary-porous coatings for enhancement of heat transfer at pool boiling. (25th March 2018)

• Record Type: Journal Article
• Authors: Surtaev, Anton; Kuznetsov, Denis; Serdyukov, Vladimir; Pavlenko, Aleksandr; Kalita, Vasiliy; Komlev, Dmitriy; Ivannikov, Aleksandr; Radyuk, Aleksey
• Is Part Of: Applied thermal engineering. Volume 133(2018)
• Page Start: 532
• Page End: 542
• Publication Date: 2018-03-25
• Subjects: Pool boiling -- Capillary-porous coating -- Heat transfer enhancement -- Plasma spraying; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2018.01.051
• Languages: English
• ISSNs: 1359-4311

Abstract

Highlights: Novel capillary-porous coatings are developed by directional plasma spraying technique. The developed coatings significantly intensify the heat transfer at boiling of water and LN2. Maximum enhancement factor on the coated surfaces is observed at low heat fluxes. The enhancement mechanisms differ depending on the liquid properties and morphology. Abstract: Pool boiling heat transfer in capillary-porous coatings was experimentally studied using two coolants (water and liquid nitrogen) at atmospheric pressure. The unique type of capillary-porous coatings with different thicknesses (400–1390 μm), morphology and with high porosity (up to 60%) were fabricated by the directional plasma spraying technique. The study shows that the use of capillary-porous coatings leads to significant enhancement of heat transfer up to 4 times at boiling of liquid nitrogen and up to 3.5 times at boiling of water in the region of low heat fluxes. Based on the analysis of high-speed video, it is shown that the mechanisms of heat transfer enhancement can differ substantially depending on the properties of liquid and morphology of coatings. The enhancement factor for the developed capillary-porous coatings is compared with the results of previous studies obtained using the structured surfaces with re-entrant cavities, microchannels and coatings fabricated by the gas-thermal methods.