Experimental studies of thermal resistance in a vapor chamber heat spreader

Tsai, Meng-Chang; Kang, Shung‐Wen; Paiva, K.V.

doi:10.1016/j.applthermaleng.2013.02.034

Cited by 93 publications

(16 citation statements)

References 4 publications

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“…The worst disadvantage of a vapor chamber can be the negative effect of the gravity on its operation [14]. In horizontal position, the fluid is indeed uniformly in-plane distributed if the capillary pumping of the wick is sufficient.…”

Section: Vapor Chambersmentioning

confidence: 99%

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Heats pipes for temperature homogenization: A literature review

Blet

Lips

Sartre

2017

Applied Thermal Engineering

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Heat pipes offer high effective heat transfer in a purely passive way. Other specific properties of heat pipes, like temperature homogenization, can be also reached. In this paper, a literature review is carried out in order to investigate the existing heat pipe systems mainly aiming the reduction of temperature gradients. The review gathering more than sixty references is sorted into various application fields, like thermal management of electronics, of storage vessels or of satellites, for which the management of the temperature uniformity differs by the isothermal surface area, temperature ranges or the targeted precision of the temperature flattening. A summary of heat pipe characteristics for this function of temperature homogenization is then performed to identify their specificities, compared to other applications of heat pipes.

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Section: Vapor Chambersmentioning

confidence: 99%

“…This function is widely used for electronics cooling. The typical heat pipes are here flat heat pipes, like vapor chambers [12][13][14], or solid plates with embedded conventional heat pipes or pulsating heat pipes [15][16]. A vapor chamber is a capillary-driven planar heat pipe with a small aspect ratio.…”

Section: Introductionmentioning

confidence: 99%

Heats pipes for temperature homogenization: A literature review

Blet

Lips

Sartre

2017

Applied Thermal Engineering

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“…To obtain the minimum thermal resistance of the vapor chamber, it depends on the operating power, fill ratio, geometries, material types of heat sinks, configuration structures of the vapor chamber (Wiriyasart and Naphon, 2018a;Ming et al, 2009), heating areas, and heating modes (Tang et al, 2013). Moreover, the influence of inclination on the vapor chamber performance and temperature uniformity also played a vital role in the total thermal resistance (Tsai et al, 2013; because it had more even temperature distributions and lower spreading resistances than an equivalent copper spreader. Besides, at a larger radius, the superiority over copper was less distinct as only a 7% reduction in spreading resistance was observed compared to a 20 % reduction at a smaller radius (Velardo et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Transient thermal performance of constant fill ratio vapor chamber with different coolants

Wiriyasart

Naphon

2021

JTST

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In this study, a constant fill ratio vapor chamber using water and ferrofluid as the coolants on the thermal performance and thermal optimization to provide the cooling range are presented. The liquid flow rate of the condenser side ranges from 0.029−0.099 kg/s, the input power of 100−300 W, heat source size of 30 mm × 30 mm, and the water and ferrofluid with φ=0 %, φ=0.005 % and φ=0.05 % as coolants are investigated. The results indicate that the minimum thermal resistance of a traditional vapor chamber of 0.126 o C/W at m o = 0.075 kg/s and vapor chamber with a mini channel of 0.077 o C/W at m o = 0.049 kg/s at φ=0.005 % are obtained. The vapor chamber with and without mini channel at a certain fill ratio of 26 % and 33 %, the heat source size of 30 mm × 30 mm, and the mass flow rate of ≥ 0.042 kg/s are withstanding the heat load range from 100-200 W. However, to achieve the high heat load range from 100-300 W, the vapor chamber with mini channel using the Fe3O4 ferrofluid φ=0.005 % is covering the entire cooling range and is recommended in electronic cooling applications.

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“…The results indicated that a 90 • inclination angle corresponds to the best thermal performance, and that the thermal performance of the grooved heat pipe can be improved significantly by using NDG nanofluids. Tsai et al (2013) conducted an investigation of standard flat heat pipe spreader and concluded that the tilt angle should be 90 • For maximum thermal resistance. Hongchuan et al (2015) proposed a new FPHP that used sintered nano-scale copper powder with a conical capillary wick used on a disc flat plate heat pipe.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Wick and the Working Medium on the Thermal Resistance of FPHP

et al. 2018

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This paper introduces a novel micro-deep, triangle-grooved wick, and compares the performance of the flat plate heat pipe (FPHP) with various types of wicks, including foam metal copper wick, sintered copper powder wick, copper mesh wick, micro-deep rectangle-grooved wick, and micro-deep triangle-grooved wick. Test results verified the feasibility of the nanofluids applied to FPHP. Tested working fluids included deionized water, Cu-water nanofluids, carbon-coated copper nanofluids and multi-walled carbon nanotube (MWCNT) nanofluids. These nanofluids were applied on foam metal FPHP and the results were compared. The results indicated that the metal foam wick is better than the other heat pipe wicks, in the contrast experiment, when the heating power is 100 w, the thermal resistance is 0.1238 • C/K. The thermal resistance of micro-deep triangle-grooved wick FPHP is 15% lower than the micro-deep rectangle-grooved wick FPHP; The optimal filled ratio of 40% can make flat heat pipe have good performance; With the increase of mass fraction of nanofluid, the thermal resistance decreased first and then increased, the best mass fraction is 0.5%, the thermal conductivity of carbon-coated copper nanofluids FPHP is optimal, the average thermal resistance is 0.1369 • C/K, and is 17 and 9% lower than the multi-walled carbon nanofluids and copper FPHP, and is 46% lower than the deionized water FPHP; The gravitational stability of the heat pipe is verified by the experiments.

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Experimental studies of thermal resistance in a vapor chamber heat spreader

Cited by 93 publications

References 4 publications

Heats pipes for temperature homogenization: A literature review

Heats pipes for temperature homogenization: A literature review

Transient thermal performance of constant fill ratio vapor chamber with different coolants

Effect of the Wick and the Working Medium on the Thermal Resistance of FPHP

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