Nucleate pool boiling heat transfer above laser machining heating surfaces with different micro-cavity geometric shape for water-aluminum oxide nanofluid

Eid, Eldesouki I.; Al-Nagdy, Ahmed A.; Khalaf-Allah, Reda A.

doi:10.1080/08916152.2021.1946207

Cited by 15 publications

(4 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A confirmation of the heat flux augmentation during boiling on laser treated silicon surfaces can be found in (Serdyukov et al, 2021). The authors (Eid et al, 2022) analysed the heater surfaces with micro-cavities produced with a fiber laser, whose depth was 0.5 mm. It was stated that the maximal improvement in heat flux reached over 120% for water boiling.…”

Section: Literature Reviewmentioning

confidence: 87%

Application of laser treatment technology for boiling heat transfer augmentation

Orman,

Radek,

Honus

et al. 2024

Production Engineering Archives

View full text Add to dashboard Cite

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.

show abstract

Section: Literature Reviewmentioning

confidence: 87%

Application of laser treatment technology for boiling heat transfer augmentation

Orman,

Radek,

Honus

et al. 2024

Production Engineering Archives

View full text Add to dashboard Cite

show abstract

“…When tested with the FC-72 dielectric fluid, a twofold-to-threefold increase in the CHF and HTC was obtained compared to an untreated surface. Eid et al [38] used laser machining to create cavities with diameters of several hundred micrometers on brass surfaces. The latter were then tested under pool boiling conditions with an alumina nanofluid and the results showed that the major enhancement of heat transfer performance in terms of increased CHF and HTC ensues due to laser-fabricated surface features, while the nanofluid provides a minor additional enhancement.…”

Section: Laser-textured Surfaces For Boiling Enhancementmentioning

confidence: 99%

Nanosecond Laser-Textured Copper Surfaces Hydrophobized with Self-Assembled Monolayers for Enhanced Pool Boiling Heat Transfer

et al. 2022

View full text Add to dashboard Cite

Increased cooling requirements of many compact systems involving high heat fluxes demand the development of high-performance cooling techniques including immersion cooling utilizing pool boiling. This study presents the functionalization of copper surfaces to create interfaces for enhanced pool boiling heat transfer. Three types of surface structures including a crosshatch pattern, shallow channels and deep channels were developed using nanosecond laser texturing to modify the surface micro- and nanomorphology. Each type of surface structure was tested in the as-prepared superhydrophilic state and superhydrophobic state following hydrophobization, achieved through the application of a nanoscale self-assembled monolayer of a fluorinated silane. Boiling performance evaluation was conducted through three consecutive runs under saturated conditions at atmospheric pressure utilizing water as the coolant. All functionalized surfaces exhibited enhanced boiling heat transfer performance in comparison with an untreated reference. The highest critical heat flux of 1697 kW m−2 was achieved on the hydrophobized surface with shallow channels. The highest heat transfer coefficient of 291.4 kW m−2 K−1 was recorded on the hydrophobized surface with deep channels at CHF incipience, which represents a 775% enhancement over the highest values recorded on the untreated reference. Surface microstructure was identified as the key reason for enhanced heat transfer parameters. Despite large differences in surface wettability, hydrophobized surfaces exhibited comparable (or even higher) CHF values in comparison with their hydrophilic counterparts, which are traditionally considered as more favorable for achieving high CHF values. A significant reduction in bubble departure diameter was observed on the hydrophobized surface with deep channels and is attributed to effective vapor entrapment, which is pointed out as a major contributing reason behind the observed extreme boiling heat transfer performance.

show abstract

“…For instance, significant HTC enhancements were observed during boiling of nanofluids [34,35]. Passive enhancement of boiling performance, such as boiling of suitable mixtures, is in demand by the industry because it does not require any input power and is easy to implement [36,37].…”

Section: Boiling Of Water-glycerin Mixturesmentioning

confidence: 99%

Saturated and subcooled pool boiling heat transfer in mixtures of water and glycerin

Vajc

Može

Hadžić

et al. 2022

Experimental Heat Transfer

View full text Add to dashboard Cite

Heat transfer coefficient (HTC) was experimentally measured for saturated and subcooled pool boiling of binary mixtures of water and glycerin. Saturated boiling was studied for mixtures with water mass fractions 𝜔 w from 100 % to 60 % on horizontal flat nickel-plated surfaces at heat fluxes from 50 to 650 kW m −2 at atmospheric pressure. Subcooled boiling was investigated in the range of subcooling from 0 to 30 K at heat fluxes of approximately 250, 450 and 650 kW m −2 . It was found that mixture effects have a significant impact on saturated boiling HTC even for mixtures with very low content of glycerin as significant drops of HTC were observed for subtle changes in composition for mixtures of high 𝜔 w . Measured HTC was successfully correlated with the combination of Yagov (1999) and Inoue and Monde (2009) correlations with a mean relative error of 12 %. A simple empirical HTC correlation is also proposed. For subcooled boiling, developed subcooled boiling regime was reached for all investigated heat fluxes. For this regime, correlations which were able to predict HTC for saturated boiling were employed to predict subcooled boiling HTCs for all investigated concentrations, heat fluxes and subcoolings. Effect of subcooling and effect of liquid composition on total HTC were of the same importance for mixtures with higher water content. With increasing concentration of glycerin in the mixture, decrease of total HTC with increasing subcooling became more significant.

show abstract

Nucleate pool boiling heat transfer above laser machining heating surfaces with different micro-cavity geometric shape for water-aluminum oxide nanofluid

Cited by 15 publications

References 38 publications

Application of laser treatment technology for boiling heat transfer augmentation

Application of laser treatment technology for boiling heat transfer augmentation

Nanosecond Laser-Textured Copper Surfaces Hydrophobized with Self-Assembled Monolayers for Enhanced Pool Boiling Heat Transfer

Saturated and subcooled pool boiling heat transfer in mixtures of water and glycerin

Contact Info

Product

Resources

About