Micro-structured rough surfaces by laser etching for heat transfer enhancement on flush mounted heat sinks

Ventola, Luigi; Scaltrito, Luciano; Ferrero, Sergio; Maccioni, Gabriele; Chiavazzo, Eliodoro; Asinari, Pietro

doi:10.1088/1742-6596/525/1/012017

Cited by 18 publications

(10 citation statements)

References 25 publications

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“…A diode-pumped solid-state (DPSS) laser system characterized by emission at 532 nm, 10 W power, 25 µm spot size, and 3000 mm s −1 scan speed has been employed for the laser etching process by Microla Optoelectronics S.r.l. [40]. Short pulse duration (nanoseconds) are employed to achieve a good match between the desired geometric characteristics and the real sample.…”

Section: Methodsmentioning

confidence: 99%

“…Thanks to this manufacturing technique, a broad variety of microstructured patterns can be engraved on metal surfaces at relatively low operating costs [39]. Laser etching has been previously employed to manufacture metal heat sinks with micro-fins characterized by lengths in the range 200-1100 µm, which showed enhanced convective heat transfer coefficient with respect to smooth heat sinks [40].…”

Section: Introductionmentioning

confidence: 99%

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Convective Heat Transfer Enhancement through Laser-Etched Heat Sinks: Elliptic Scale-Roughened and Cones Patterns

et al. 2020

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The efficient dissipation of localized heat flux by convection is a key request in several engineering applications, especially electronic ones. The recent advancements in manufacturing processes are unlocking the design and industrialization of heat exchangers with unprecedented geometric characteristics and, thus, performance. In this work, laser etching manufacturing technique is employed to develop metal surfaces with designed microstructured surface patterns. Such precise control of the solid-air interface (artificial roughness) allows to manufacture metal heat sinks with enhanced thermal transmittance with respect to traditional flat surfaces. Here, the thermal performance of these laser-etched devices is experimentally assessed by means of a wind tunnel in a fully turbulent regime. At the highest Reynolds number tested in the experiments ( R e L ≈ 16 , 500 ), elliptic scale-roughened surfaces show thermal transmittances improved by up to 81% with respect to heat sinks with flat surface. At similar testing conditions, cones patterns provide an enhancement in Nusselt number and thermal transmittance of up to 102% and 357%, respectively. The latter results are correlated with the main geometric and thermal fluid dynamics descriptors of the convective heat transfer process in order to achieve a predictive model of their performance. The experimental evidence shown in this work may encourage and guide a broader use of micro-patterned surfaces for enhancing convective heat transfer in heat exchangers.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Convective Heat Transfer Enhancement through Laser-Etched Heat Sinks: Elliptic Scale-Roughened and Cones Patterns

et al. 2020

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“…Table 2 illustrates roughness indicators for the channel surfaces, where the measurements, for the FSC channels, have been taken from the sample presented in Figure 8, according to the sections identified in Figure 7. Surface roughness has been shown to enhance convective heat transfer [42,43]. However, surface topology also alters the vortices near the surface and it has a great effect on heat transfer.…”

Section: Geometric Characterization Of Channel Surfacesmentioning

confidence: 99%

Thermal Efficiency and Material Properties of Friction Stir Channelling Applied to Aluminium Alloy AA5083

et al. 2019

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The Friction Stir Channelling (FSC) is a novel advanced solution for producing internal closed channels along any desired path with a constant or continuously modified shape along the path in a single manufacturing step. The channels are formed by continuous extraction of part of the stirred processed material into external flash. In this work, the performance of channels with the same shape and dimensions but produced by FSC and milling respectively, are compared using an experimental calorimeter setup with a focus on the influence of the geometrical features of the channels on the thermal efficiency. The investigation is implemented in a plate of AA5083-H111, with a thickness of 10 mm. The material properties of the channels produced by FSC are investigated with a microhardness field and optical microscopic analysis, assessing the thermomechanically processed and heat affected zones. The mechanical resistance of the channels produced by FSC is evaluated with an application of internal pressure up to 380 bar. The results show that the FSC enhanced the heat transfer by about 45 % compared with smoother milled channels. The optical microscopy shows evidence of a good consolidation of the solid state joining mechanisms activated during the FSC, with a small reduction of the hardness around the channel in the stirred zone and heat affected zone, being assisted by a harder top region at the ceiling of the channel.

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“…Shahzad et al [4] have developed a carbon nanotubes structures on a patterned Si surface and enhanced the convective heat transfer. Ventola et al [5] experimentally compared the heat transfer perfor- mance of laser etched surface and smooth surface heat sinks. Based on the study the laser etched surfaces shows a significant result compared to the smooth heat sinks.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer enhancement by coated fins in the microscale domain

Thanigaivelan¹,

Deepa²

2018

THERM SCI

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Original scientific paper https://doi.org/10.2298/TSCI160901089TMicro-fins configuration is considered as a capable cooling method for microelectronic components due to its space optimization and types of heat transfer. In this study micro-fins profile is selected according to the type of heat transfer and fabricated on copper and aluminum materials through wire-cut electric discharge machining process. The four numbers of square test pieces of dimensions of 4.5 cm × 4.5 cm and fin height, H, of 0.25 mm with different spacing, S, of 3.75 mm and 5 mm are considered for the experimentation. The fabricated test pieces such as aluminum, copper, painted aluminum, and painted copper are used in this experiments. This paper aims to improve the convective heat transfer coefficient by applying aluminum paint coating on a micro-fin structure. The paint coated copper test piece produces 20.62% higher heat transfer compared to aluminum test piece. On comparing the aluminum with aluminum paint coated test piece, the convective heat transfer rate found to increase by 49%. Coated aluminum test piece with 3.75 mm and 5 mm spacing shows higher radiation heat transfer compared to other micro-fin structures.

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Micro-structured rough surfaces by laser etching for heat transfer enhancement on flush mounted heat sinks

Cited by 18 publications

References 25 publications

Convective Heat Transfer Enhancement through Laser-Etched Heat Sinks: Elliptic Scale-Roughened and Cones Patterns

Convective Heat Transfer Enhancement through Laser-Etched Heat Sinks: Elliptic Scale-Roughened and Cones Patterns

Thermal Efficiency and Material Properties of Friction Stir Channelling Applied to Aluminium Alloy AA5083

Heat transfer enhancement by coated fins in the microscale domain

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