Analyzing the structural designs and thermal performance of nonmetal lighting devices of LED bulbs

Wang, Rong-Tsu; Wang, Jung‐Chang

doi:10.1016/j.ijheatmasstransfer.2016.03.112

Cited by 18 publications

(10 citation statements)

References 19 publications

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“…Where L is the characteristic length of the fin, defined as , Tb is the wall temperature of the aluminum insert and Tair is the ambient air temperature, and T1 and T2 the temperature distributions in the polymer core and coating respectively. Substituting these dimensionless variable into equation (1) gives,…”

Section: Analytical Modelingmentioning

confidence: 99%

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Analyitcal heat conduction model of annular composite fins

Feng¹,

Ygeswaran²,

Gibbons³

et al. 2018

Progress in Canadian Mechanical Engineering

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A two-dimensional analytical heat conduction model of an annular composite fin has been carried out. The composite fins composed of a porous polyethylene core, a square aluminum insert, and metallic zinc coating layers, was fabricated using wire-arc spraying technology. Analytical solutions of temperature distribution, energy dissipation and fin efficiency through the fins at natural convection condition have been proposed.

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Section: Analytical Modelingmentioning

confidence: 99%

“…Composite fins are used in industrial applications such as heat exchangers and heat sinks [1]. In such composite fins the thermal conductivities of the coating (kc) and substrate (ks) materials differ and the total heat transfer depends on the thermal conductivity ratio (kc/ks).…”

Section: Introductionmentioning

confidence: 99%

Analyitcal heat conduction model of annular composite fins

Feng¹,

Ygeswaran²,

Gibbons³

et al. 2018

Progress in Canadian Mechanical Engineering

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show abstract

“…Though the effective thermal conductivity of the composites is much lower than that of pure metal, it is adequate for applications that do not require high heat fluxes. An alternate method of making a composite cooling device that has been proposed [6] is to make the heat sink out of polymer and insert aluminum components into it to provide heat conduction paths. Numerical simulations have shown that such a device could reduce the junction temperatures of LED bulbs, with the metal inserts significantly enhancing heat transfer.…”

Section: Introductionmentioning

confidence: 99%

“…Different designs of composite heat sinks have been tested for thermal management of electronic devices [3], [6], [7], [8]. Yang et al [3] used vacuum pressure casting to manufacture finned heat sinks for LEDs from a mixture of graphite and metal powders.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Composite Heat Sinks Consisting of a Thin Metallic Skin and a Polymer Core Using Wire-Arc Spraying

2019

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Three composite heat sinks in the shape of a disk, a cylinder, and a cylinder with vertically projecting fins were made by applying a thin (0.4 -0.7 mm) zinc layer onto ABS polymer cores using wire-arc spraying. The influence of spray distance and surface roughness on the adhesion strength between the zinc and ABS layers were investigated and a maximum adhesion strength of 2.6 MPa was obtained. An analytical model of the heat conduction in an annular fin was developed, assuming one-dimensional heat conduction in the metal coating and twodimensional conduction in the polymer core. The temperature distribution along the disk-shaped heat sink was measured using an infra-red camera and found to agree well with the developed model. The calculated temperatures at the base of the heat sink also agreed with measured values as heater power was varied. The model was used to examine the effect of fin radius and coating thickness on fin efficiency.

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“…Effective thermal dissipation of LED devices is crucial in maintaining luminous performance and extending a LEDs lifespan [6,[9][10][11][12]. Numerous authors haven investigated the thermal disipation of LED devices both experimentally [3,10,[13][14][15] and numerically [16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Composite Heat Sink LED Cooling

Gibbons¹,

Feng²,

Chandra³

2018

Progress in Canadian Mechanical Engineering

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Metal coating of 3D printed polymers is an attractive proposition for thermal dissipation of light emitting diodes, due to its high efficiency and markedly lower material costs than conventional aluminum heat sinks. Efficient thermal cooling of light emitting diodes is essential in maintaining electronic and optical performance. The thermal performance of three heat sink designs were experimentally investigated for three applied heat fluxes (0.5-1.5 W cm-2). The results show that metal coating of the polymer heat sinks enables significant heat transfer enhancement of 37% over the uncoated case. The inclusion of an aluminum insert into the base of the composite heat sink design, in tandem with the zinc coating reduced on chip temperatures by 27% over the zinc coated case for the greatest applied heat flux.

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Analyzing the structural designs and thermal performance of nonmetal lighting devices of LED bulbs

Cited by 18 publications

References 19 publications

Analyitcal heat conduction model of annular composite fins

Analyitcal heat conduction model of annular composite fins

Fabrication of Composite Heat Sinks Consisting of a Thin Metallic Skin and a Polymer Core Using Wire-Arc Spraying

Composite Heat Sink LED Cooling

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