Abstract
The paper presents the results of experimental research on pool boiling heat transfer of dielectric liquid FC-72. Measurements were made at atmospheric pressure on open surfaces with microchannels. Heat transfer surfaces, in the form of parallel milled microchannels, were made of copper. The rectangular cross-sectional microchannels were 0.2 to 0.5 mm deep and 0.2 to 0.4 mm wide. The surfaces, compared to a smooth flat surface, provided a five-fold increase in the heat transfer coefficient and a two-fold increase in the critical heat flux. The article analyses the influence of the width and height of the microchannel on the heat transfer process. The maximum heat flux was 271.7 kW/m2, and the highest heat transfer coefficient obtained was 25 kW/m2K. Furthermore, the experimental results were compared with selected correlations for the nucleate pool boiling.
Highlights
The purpose of this study was to analyze the results of FC-72 pool boiling tests on a surface with microchannels with a width of 0.2–0.4 mm and depths of 0.2–0.5 mm and to compare the heat transfer coefficients and the maximum heat fluxes with the data in the available literature
Experimental investigations were carried out for boiling FC-72, at atmospheric prescarried out boiling FC-72, at atmospheric sure,Experimental on a smoothinvestigations plain surfacewere and surfaces withformachined microchannels
The best results were obtained for surfaces with microchannels 0.3 mm deep (MC-0.3-0.5-0.6)
Summary
Citation: Kaniowski, R.; Pastuszko, R. Boiling of FC-72 on Surfaces withOpen Copper Microchannel. Energies2021, 14, 7283. https://doi.org/10.3390/en14217283Academic Editor: Marco LorenziniReceived: 7 October 2021Accepted: 1 November 2021Published: 3 November 2021Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.Licensee MDPI, Basel, Switzerland.Attribution (CC BY) license (https://
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