Numerical analysis and experimental verification on thermal fluid phenomena in a vapor chamber

Koito, Yasushi; Imura, Hidefumi; Mochizuki, Masahito; Saito, Yuji; Torii, Shuichi

doi:10.1016/j.applthermaleng.2005.11.012

Cited by 120 publications

(38 citation statements)

References 3 publications

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“…The linear model assumed negligible thermal resistance due to vapor convection, and treated the vapor as a common interface between the evaporator and condenser wicks; the utility and accuracy of the model were later demonstrated through analysis of a complete thermal heat sink package with an embedded vapor chamber [112]. Additional detailed, three-dimensional numerical models that solved for flow and heat transport in vapor chambers were presented by Koito et al [113] and Xiao and Faghri [114]. …”

Section: Numerical Modeling Approachesmentioning

confidence: 99%

Recent Advances in Vapor Chamber Transport Characterization for High-Heat-Flux Applications

Weibel

Garimella

2013

Advances in Heat Transfer

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Owing to their high reliability, simplicity of manufacture, passive operation, and effective heat transport, flat heat pipes and vapor chambers are used extensively in the thermal management of electronic devices. The need for concurrent size, weight, and performance improvements in high-performance electronics systems, without resort to active liquid-cooling strategies, demands passive heat spreading technologies that can dissipate extremely high heat fluxes from small hot spots. In response to these daunting application-driven trends, a number of recent investigations have focused on the design, characterization, and fabrication of ultra-thin vapor chambers for proximate heat spreading away from these hot spots. The predominant transport mechanisms and operational limits have been found to be different under these conditions relative to conventional low-power heat pipes. Noteworthy advances in the fundamental understanding of evaporation and boiling from porous microstructures fed by capillary action, and improvements in vapor chamber characterization, modeling, design, and fabrication techniques are reviewed. Characterization of evaporation and boiling from idealized and realistic wick structures, observation of vapor formation regimes as a function of operating conditions, assessment of fluid dryout limitations, design of novel multi-scale and nanostructured wicks for enhanced transport, and incorporation of these high heat flux transport phenomena into device-level models are discussed. These recent developments have successfully extended the maximum operating heat flux limits of vapor chambers.2

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Section: Numerical Modeling Approachesmentioning

confidence: 99%

Recent Advances in Vapor Chamber Transport Characterization for High-Heat-Flux Applications

Weibel

Garimella

2013

Advances in Heat Transfer

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“…The rectangular shape of the FPHP, heater block, and cold plate lend themselves well to meshing using Cartesian coordinates and hence the use of Flotherm for a fast and converging solution. Description of the mathematical model for momentum, mass, and energy conservation that underpin the CFD simulation was not the focus of this paper as similar models are widely available in published literature that can be found in [14][15][16]. The Flotherm model was built using standard Cuboids and Prism elements for the FPHP components including the evaporator and condenser copper plates, the wick layer, the void (vapour) space, and the supporting solid columns.…”

Section: Fphp Cfd Simulationmentioning

confidence: 99%

Simulation and Experimental Investigation of Thermal Performance of a Miniature Flat Plate Heat Pipe

Boukhanouf

Haddad²

2013

Advances in Mechanical Engineering

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This paper presents the results of a CFD analysis and experimental tests of two identical miniature flat plate heat pipes (FPHP) using sintered and screen mesh wicks and a comparative analysis and measurement of two solid copper base plates 1 mm and 3 mm thick. It was shown that the design of the miniature FPHP with sintered wick would achieve the specific temperature gradients threshold for heat dissipation rates of up to 80 W. The experimental results also revealed that for localised heat sources of up to 40 W, a solid copper base plate 3 mm thick would have comparable heat transfer performances to that of the sintered wick FPHP. In addition, a marginal effect on the thermal performance of the sintered wick FPHP was recorded when its orientation was held at 0 ∘ , 90 ∘ , and 180 ∘ and for heat dissipation rates ranging from 0 to 100 W.

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“…The effects of different heat fluxes and inclination angles on heat transfer resistance of PHP were analyzed through experimental study [10] and numerical simulation [11]. The results showed that the smaller effective thermal conductivity of the wick could produce a larger temperature gradient, especially in the heating region near the heat source.…”

Section: Introductionmentioning

confidence: 99%

A Novel Semi-Visualizable Experimental Study of a Plate Gravity Heat Pipe at Unsteady State

Gou

Zhang

et al. 2017

Energies

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An experimental study on a plate gravity heat pipe (PGHP) with inner cavity size of length 100 mm (X), width 2.5 mm (Y), and height 210 mm (Z) with acetone as the working fluid was carried out. The effects of heating power inputs (80-180 W) and fluid filling ratios (25%, 48%, and 55%) on the start-up temperature, start-up time, temperature difference, and relative thermal resistance on the Z-axis of the PGHP in a vacuum of 1 × 10 −3 Pa were studied at unsteady state. Furthermore, the gas-liquid two-phase behavior of the interior working fluid of PGHP, and the coupling heat transfer behavior of the boiling liquid and the condensate were observed through a visualizable window under different experimental conditions. The results show that, with the increase of heating power input, the start-up temperature of the PGHP increases and the start-up time is shortened. The start-up temperature of the PGHP was around 33 • C and the start-up time was about 320 s at the heating power input of 120 W and working fluid filling ratio of 55%. The relative thermal resistance and the temperature difference on the Z-axis of the PGHP increase firstly and then decrease with the increase of heating power input at unsteady state. The complex gas-liquid two-phase behavior of the PGHP mainly includes: the formation and growth of bubbles, the merging and break up of bubbles, and the coupling heat transfer between boiling liquid and condensate, which demonstrate that the novel SVPGHP can be used to effectively study the heat transfer process of PGHP.

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Numerical analysis and experimental verification on thermal fluid phenomena in a vapor chamber

Cited by 120 publications

References 3 publications

Recent Advances in Vapor Chamber Transport Characterization for High-Heat-Flux Applications

Recent Advances in Vapor Chamber Transport Characterization for High-Heat-Flux Applications

Simulation and Experimental Investigation of Thermal Performance of a Miniature Flat Plate Heat Pipe

A Novel Semi-Visualizable Experimental Study of a Plate Gravity Heat Pipe at Unsteady State

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