Pool Boiling of Ethanol on Copper Surfaces with Rectangular Microchannels

In this paper, pool boiling of ethanol at atmospheric pressure was analyzed. The enhanced surfaces were made of copper, on which grooves with a depth ranging from 0.2 to 0.5 mm were milled in parallel. The widths of the microchannels and the distances between them were 0.2 mm, 0.3 mm and 0.4 mm, res...

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Bibliographic Details
Published in:Energies (Basel) 2023-12, Vol.16 (23), p.7883
Main Authors: Kaniowski, Robert, Pastuszko, Robert, Dragašius, Egidijus, Baskutis, Saulius
Format: Article
Language:English
Subjects:
Acetaldehyde
Alcohol
Alcohol, Denatured
Atmospheric pressure
bubble departure diameter
Contact angle
Copper
Equipment and supplies
Ethanol
Gas-turbines
Heat conductivity
Heat exchangers
Heat transfer
heat transfer coefficient
Heating
microchannel
pool boiling
Power electronics
Temperature
Thermocouples
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Summary:In this paper, pool boiling of ethanol at atmospheric pressure was analyzed. The enhanced surfaces were made of copper, on which grooves with a depth ranging from 0.2 to 0.5 mm were milled in parallel. The widths of the microchannels and the distances between them were 0.2 mm, 0.3 mm and 0.4 mm, respectively. The highest heat transfer coefficient, 90.3 kW/m2K, was obtained for the surface with a microchannel depth of 0.5 mm and a width of 0.2 mm. The maximum heat flux was 1035 kW/m2. For the analyzed surfaces, the maximum heat flux increase of two and a half times was obtained, while the heat transfer coefficient increased three-fold in relation to the smooth surface. In the given range of heat flux 21.2–1035 kW/m2, the impact of geometric parameters on the heat transfer process was presented. The diameters of the departing bubbles were determined experimentally with the use of a high-speed camera. A simplified model was proposed to determine the diameter of the departure bubble for the studied surfaces.
ISSN:1996-1073
1996-1073
DOI:10.3390/en16237883