Enhancement in nucleate pool boiling heat transfer on nano-second laser processed copper surfaces

Nirgude, Vishal V.; Sahu, Santosh Kumar

doi:10.1080/08916152.2018.1559262

Cited by 22 publications

(6 citation statements)

References 41 publications

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“…Several methods for micro- and nanotexturing of the boiling surface have been shown to enhance boiling heat transfer, , yet few of these methods are truly scalable and straightforward while still offering great boiling enhancements. − Herein lies the advantage of laser texturing, which can be utilized to modify the micro- and nanostructure of the surface, its chemical composition, and morphology, , all of which significantly affect boiling heat transfer. To this effect, Kruse et al produced multiscale structures on stainless steel using a femtosecond laser, while Nirgude and Sahu applied nanosecond laser texturing to functionalize copper surfaces. Zupančič et al and Voglar et al used a nanosecond laser to produce microcavities on a stainless steel surface, which were proven to greatly enhance the boiling heat transfer by serving as active nucleation sites from which bubbles prefer to form, while Može et al demonstrated that this approach can also be applied to copper.…”

Section: Introductionmentioning

confidence: 99%

Laser-Engineered Microcavity Surfaces with a Nanoscale Superhydrophobic Coating for Extreme Boiling Performance

Može

Senegačnik

Gregorčič

et al. 2020

ACS Appl. Mater. Interfaces

113

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Functionalized interfaces enhancing phase-change processes have immense applicability in thermal management. Here, a methodology for fabrication of surfaces enabling extreme boiling heat transfer performance is demonstrated, combining direct nanosecond laser texturing and chemical vapor deposition of a hydrophobic fluorinated silane. Multiple strategies of laser texturing are explored on aluminum with subsequent nanoscale hydrophobization. Both superhydrophilic and superhydrophobic surfaces with laser-engineered microcavities exhibit significant enhancement of the pool boiling heat transfer. Surfaces with superhydrophobic microcavities allow for enhancements of a heat transfer coefficient of over 500%. Larger microcavities with a mean diameter of 4.2 μm, achieved using equidistant laser scanning separation, induce an early transition into the favorable nucleate boiling regime, while smaller microcavities with a mean diameter of 2.8 μm, achieved using variable separation, provide superior performance at high heat fluxes. The enhanced boiling performance confirms that the Wenzel wetting regime is possible during boiling on apparently superhydrophobic surfaces. A notable critical heat flux enhancement is demonstrated on superhydrophobic surfaces with an engineered microstructure showing definitively the importance and concomitant effect of both the surface wettability and topography for enhanced boiling. The fast, low-cost, and repeatable fabrication process has great potential for advanced thermal management applications.

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Section: Introductionmentioning

confidence: 99%

Laser-Engineered Microcavity Surfaces with a Nanoscale Superhydrophobic Coating for Extreme Boiling Performance

Može

Senegačnik

Gregorčič

et al. 2020

ACS Appl. Mater. Interfaces

113

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“…The deepest grooves performed best, but all of the specimens proved to be better than the smooth surface, especially at low temperature differences. The authors (Nirgude and Sahu, 2018) conducted tests of water and acetone boiling on surfaces with longitudinal grooves, which were made with the laser beam. All of the produced surfaces provided augmentation of heat flux (the value of the heat transfer coefficient was maximally almost two times higher than for the reference surface).…”

Section: Literature Reviewmentioning

confidence: 99%

Application of laser treatment technology for boiling heat transfer augmentation

Orman,

Radek,

Honus

et al. 2024

Production Engineering Archives

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Boiling heat transfer can be enhanced when the heater’s surface morphology is altered. The paper discusses the use of the laser beam to produce efficient heat exchangers. Two types of samples were investigated with distilled water and ethyl alcohol as boiling agents. The specimens differed with the height of the microfins: 0.19 mm and 0.89 mm. It was observed that both of them enhanced boiling heat transfer in comparison to the smooth reference surface. However, the sample with higher microfins performed better, especially in the region of low temperature differences, where the heat flux was about three times higher than in the case of the smaller microfins. The comparison of the experimental data with selected models of boiling heat transfer revealed significant differences with regard to the heat flux. The laser-made samples dissipated larger heat fluxes than it could be anticipated according to the models. It might be linked with high surface roughness of the area between the microfins, generated as a result of the laser beam interaction with the surface.

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“…The deepest grooves proved to be most advantageous, but all the samples improved boiling conditions, especially for small superheats. Surfaces with longitudinal grooves generated with a nanosecond laser were tested by Nirgude and Sahu [ 21 ] with acetone as the boiling agent. All the samples provided enhanced heat transfer conditions.…”

Section: Introductionmentioning

confidence: 99%

Laser Treatment of Surfaces for Pool Boiling Heat Transfer Enhancement

et al. 2023

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The laser treatment of surfaces enables the alteration of their morphology and makes them suitable for various applications. This paper discusses the use of a laser beam to develop surface features that enhance pool boiling heat transfer. Two types of structures (in the ‘macro’ and ‘micro’ scale) were created on the samples: microfins (grooves) and surface roughness. The impact of the pulse duration and scanning velocity on the height of the microfins and surface roughness at the bottom of the grooves was analyzed with a high precision optical profilometer and microscope. The results indicated that the highest microfins and surface roughness were obtained with a pulse duration of 250 ns and scanning velocity of 200 mm/s. In addition, the influence of the ‘macro’ and ‘micro’ scale modifications on the boiling heat transfer of distilled water and ethyl alcohol was studied on horizontal samples heated with an electric heater. The largest enhancement was obtained for the highest microfins and roughest surfaces, especially at small superheats. Heat flux dissipated from the samples containing microfins of 0.4 mm height was, maximally, over three times (for water) and two times (for ethanol) higher than for the samples with smaller microfins (0.2 mm high). Thus, a modification of a selected model of boiling heat transfer was developed so that it would be applicable to laser-processed surfaces. The correlation proved to be quite successful, with almost all experimental data falling within the ±100% agreement bands.

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Enhancement in nucleate pool boiling heat transfer on nano-second laser processed copper surfaces

Cited by 22 publications

References 41 publications

Laser-Engineered Microcavity Surfaces with a Nanoscale Superhydrophobic Coating for Extreme Boiling Performance

Laser-Engineered Microcavity Surfaces with a Nanoscale Superhydrophobic Coating for Extreme Boiling Performance

Application of laser treatment technology for boiling heat transfer augmentation

Laser Treatment of Surfaces for Pool Boiling Heat Transfer Enhancement

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