Heat transfer enhancement in nucleate pool boiling using laser processed surfaces: Effect of laser wavelength and power variation

Nirgude, Vishal V.; Sahu, Santosh Kumar

doi:10.1016/j.tca.2020.178788

Cited by 14 publications

(2 citation statements)

References 49 publications

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“…The research works considering the influence of laser treatment on pool boiling are quite new, very rare, and cover only a few samples’ experiments. The first to mention pool boiling were Nirgude and Sahu [ 36 ], who investigated the influence of laser processing parameters on water pool boiling performance with six samples. A nanosecond laser was used in the study and samples were treated with varying wavelengths of 1064 nm, 355 nm, and 532 nm (all at 10 Hz) and with laser powers from 0.8 W to 4.6 W; the surface roughness produced ranged from 0.237 to 0.496 μm.…”

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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Section: Introductionmentioning

confidence: 99%

Laser Treatment of Surfaces for Pool Boiling Heat Transfer Enhancement

et al. 2023

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“…Study of pool boiling heat transfer with experimental approach has been the dominant path of research in the recent years. Modified heater surfaces, such as porous surface structures were tested by Zhang et al [14], Huang et al [15], Mehdikhani et al [16], and other types of modified heater surfaces, e.g., Ranjan et al [17], Nirgude and Sahu [18], Singh and Sharma [19], were subjected to pool boiling experiments and had shown enhanced heat transfer characteristics. On the other hand, there are many different theoretical models of bubble growth [6,20,21] and also a large number of approaches with simulation of pool boiling [22][23][24][25][26] available in the heat transfer literature.…”

Section: Introductionmentioning

confidence: 99%

Physical Model of a Single Bubble Growth during Nucleate Pool Boiling

Voglar¹

2022

Fluids

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A simplified physical model of a single bubble growth during nucleate pool boiling was developed. The model was able to correlate the experimentally observed data of the bubble’s growth time and its radius evolution with the use of the appropriate input parameters. The calculated values of separated heat fluxes from the heater wall, thermal boundary layer, and to the bulk liquid gave us a new insight into the complex mechanisms of the nucleate pool boiling process. The thermal boundary layer was found to supply the majority of the heat to the growing bubble. The heat flux from the thermal boundary layer to the bubble was found to be close to the Zuber’s critical heat flux limit (890 kW/m2). This heat flux was substantially larger than the input heater wall heat flux of 50 kW/m2. The thermal boundary layer acts as a reservoir of energy to be released to the growing bubble, which is filled during the waiting time of the bubble growth cycle. Therefore, the thickness of the thermal boundary layer was found to have a major effect on the bubble’s growth time.

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Experimental Investigation on Pool Boiling Heat Transfer Performance of Superhydrophilic, Hydrophilic and Hydrophobic Surface

Singh,

Sharma

2024

Int J Thermophys

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Heat transfer enhancement in nucleate pool boiling using laser processed surfaces: Effect of laser wavelength and power variation

Cited by 14 publications

References 49 publications

Laser Treatment of Surfaces for Pool Boiling Heat Transfer Enhancement

Laser Treatment of Surfaces for Pool Boiling Heat Transfer Enhancement

Physical Model of a Single Bubble Growth during Nucleate Pool Boiling

Experimental Investigation on Pool Boiling Heat Transfer Performance of Superhydrophilic, Hydrophilic and Hydrophobic Surface

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