Enhanced nucleate boiling of Novec 649 on thin metal foils via laser-induced periodic surface structures

Zupančič, Matevž; Fontanarosa, Donato; Može, Matic; Bucci, Mattia; Vodopivec, Matevž; Nagarajan, Balasubramanian; Vetrano, Maria Rosaria; Castagne, Sylvie; Golobič, Iztok

doi:10.1016/j.applthermaleng.2023.121803

Cited by 11 publications

(1 citation statement)

References 61 publications

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“…An effective method for increasing the heat transfer coefficient and heat flux is to use the boiling process, as large heat fluxes can be dissipated due to the latent heat of vaporization (ethanol 963 kJ/kg, water 2257 kJ/kg at boiling point, atmospheric pressure). The modification of the surface, which can consist in a change in geometry, the roughness of the heating surface [3], covering it with a porous [4] or capillary porous layer [5,6], texturing, the use of surface structures [7], metal foams [8,9], the formation of subsurface tunnels, small fins [10,11] or microchannels [12,13], contributes to a multiplication of the heat transfer coefficient (HTC), reduces the temperature difference between the surface and the fluid (superheat), and increases the critical heat flux (CHF) multiple times. These parameters are responsible for the efficient operation of heat spreaders and heat exchangers with phase change.…”

Section: Introductionmentioning

confidence: 99%

Pool Boiling of Ethanol on Copper Surfaces with Rectangular Microchannels

Kaniowski,

Pastuszko,

Dragašius

et al. 2023

Energies

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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.

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