Investigation of a novel natural convection heat sink for LEDs based on U-shaped mini-heat pipe arrays

Jiu, Yuan; Fan, Hongming; Wang, Wei

doi:10.1016/j.applthermaleng.2021.118000

Cited by 21 publications

(4 citation statements)

References 39 publications

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Section: Applications Of Tceipcsmentioning

confidence: 99%

“…Due to its advantages of small size, high luminous efficiency, low energy consumption, high brightness and environmental protection, governments of various countries have increased funding and corresponding policy support for research. 100,101 High-power LED convert the energy of their input power into light and the remaining electrical energy into heat. If the heat generated by the light cannot be exported from the overall components of the lamp in time, but accumulated in the LED interior.…”

Section: Application Of Led Chip Heat Dissipationmentioning

confidence: 99%

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Research advances in preparation, mechanism and application of thermally conductive and electrically insulating polymer composites in thermal management materials: A review

Wang

2023

High Performance Polymers

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Today, electronic components are gradually developing towards miniaturization and multi-function. During the use of electronic components, a large amount of heat will be generated, which seriously limits the performance and service life of electronic components. Therefore, the preparation of thermal management material (TMMs) with high thermal conductivity (λ) can effectively solve the problem of thermal accumulation in electronic components. Compared with the preparation of intrinsic thermal conductive polymer composite, the method of filling thermal conductive filler in polymer matrix can better improve the λ of polymer composite. This review discusses the heat conduction mechanism of polymer and the factors affecting λ of polymer composites, including the type of filler, the shape and distribution of filler, and the functional surface treatment of filler. Then, the different methods of preparing thermally conductive and electrically insulating polymer composites (TCEIPCs) are introduced in detail. The application of polymer composites in thermal management is also introduced.

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Section: Applications Of Tceipcsmentioning

confidence: 99%

Section: Application Of Led Chip Heat Dissipationmentioning

confidence: 99%

Research advances in preparation, mechanism and application of thermally conductive and electrically insulating polymer composites in thermal management materials: A review

Wang

2023

High Performance Polymers

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“…This means the enclosure air at that part is also hot compare to the other rest of the enclosure. This could potentially reduce the buoyancy effect due to the reduced ΔT between the air film near the fins and enclosure air which could potentially decrease the turbulence at this region [34]. As a result of this, the heat transferred by convection is reduced leaving the top of the fins at minimum temperature value.…”

Section: Effect Of Perforation Shapesmentioning

confidence: 99%

Thermal Performance Optimization of Perforated Fins for Flat Plate Heat Sinks Using CFD Approach

Al-Muhsen,

Al-Khafaji,

Ismail

2023

IJHT

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A comprehensive multi-dimensional computational fluid dynamics (CFD) analysis was conducted on a flat plate heat sink, equipped with four perforated fins. This study aimed to optimize the thermal performance by exploring the effects of the geometry and placement of the perforations within the fins. The heat transfer was modelled under conduction for the heat sink body, and natural convection for the enclosure. The investigation focused on the combined influence of the shape of the fin perforations (circular, square, triangular) and their spatial positioning (bottom, middle, top) on the overall thermal performance. It was observed that the temperature gradients (ΔT) from the bottom to the top of the fins were significantly enhanced with the introduction of perforations. Notably, the smallest ΔT of 2.64℃ was recorded with circular perforations, independent of their placement within the fin matrix. Conversely, the highest ΔT of 12.58℃ was observed when the perforations were triangular in shape. Furthermore, an increase in ΔT was noted when all perforation matrices were relocated from the top to the bottom of the fins. Interestingly, the heat transfer coefficient was found to be higher when the heat sink made use of perforated fins. However, the effect of the perforations' shape and placement on this coefficient was found to be less significant. In conclusion, optimal thermal performance was achieved with circularly perforated fins. The buoyancy effect within the enclosure and in the vicinity of the fins was amplified when the heat sink's fins were top-positioned and circularly perforated. This resulted in a 15.6% increase in ΔT, but also a 29.6% increase in the heat transfer coefficient, indicating an overall enhancement in thermal performance under most tested conditions.

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“…A heat sink is considered one of the conventional approaches to address thermal issues in high-power LED lighting (Bobaru and Rachakonda, 2004;Bouknadel et al, 2014;Lee, 1995). For the improved thermal management, alternative methods such as jet impact cooling, phase-change cooling, and the use of nanofluids have been reported (Chen et al, 2022;Jiu et al, 2022;Lin et al, 2012;Moradikazerouni, 2022;Naphon et al, 2018;Ramos-Alvarado et al, 2013;Ramesh et al, 2022). While these methods offer enhanced the heat dissipation, they often require the use of a fan, complex and costly designs, and regular maintenance, leading to disadvantages such as extra additional energy consumption, bulkier systems, and significant noise levels (Lai et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Thermal management of multiple LEDs for high-power lighting applications

Cho,

JANG

2023

IJERR

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Power LED lighting has suffered from substantial heat generated, leading to significant performance degradation. Consequently, achieving an optimal distribution of LEDs is essential to ensure high luminance efficiency. Implementing effective thermal treatment is important to prevent any potential degradation in the performance of the LED lighting system. Optimizing the arrangement of individual LEDs is a promising approach to mitigating heat accumulation issues. In this paper, we propose a reasonable approach to obtaining the optimal distribution of LED lighting systems under DC biasing and PWM operating conditions. The thermal analysis simulation was performed based on the theoretical assumption to evaluate the thermal distribution of a single LED. Thermal analysis was conducted on an LED lighting system with 20 LEDs, and the distance between LEDs ranged from 4 mm to 24 mm. The simulated analysis showed that the maximum temperature could be controlled from 65.1 ℃ to 58.7 ℃. We discussed the optimum arrangement of LEDs and how heat generated by an LED influences the system. In addition, the LED lighting was operated in PWM mode to mitigate the thermal issues. The relationship between luminance efficiency and operation condition is discussed. Thus, the luminance efficiency improved from 114.8 lm/W to 126.8 lm/W, and the thermal relaxation time was no longer than 0.013 s. The process of determining the optimal distance between LEDs was very effective in achieving an optimized power operating condition and LEDs distribution in the module for a compact volume and enhanced performance.

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Investigation of a novel natural convection heat sink for LEDs based on U-shaped mini-heat pipe arrays

Cited by 21 publications

References 39 publications

Research advances in preparation, mechanism and application of thermally conductive and electrically insulating polymer composites in thermal management materials: A review

Research advances in preparation, mechanism and application of thermally conductive and electrically insulating polymer composites in thermal management materials: A review

Thermal Performance Optimization of Perforated Fins for Flat Plate Heat Sinks Using CFD Approach

Thermal management of multiple LEDs for high-power lighting applications

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