On the effective thermal conductivity of the vapour region in vapour chamber heat spreaders

Velardo, Jason; Date, Abhijit; Singh, Randeep; Nihill, Jack; Date, Ashwin; Phan, Thanh Long

doi:10.1016/j.ijheatmasstransfer.2019.118797

Cited by 20 publications

(6 citation statements)

References 25 publications

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“…A VC is made of copper plates (envelope) whose join creates a vessel of a certain volume, an internal wicking structure and a working fluid, which is inserted before the vessel is mechanically sealed. The sealing process creates low pressure – near vacuum – that, in turn, allows the working fluid to boil and vaporise at a much lower temperature than its original boiling temperature (Velardo et al, 2019). When the heat source is applied, the vaporised working fluid fills the entire volume of the chamber.…”

Section: Theoretical Framework Of Thermoelectric Energy Harvestingmentioning

confidence: 99%

Thermoelectric energy harvesting using vapour chamber coolers for aerospace applications

Sarris

Bhatti

Ciampa

2021

Journal of Intelligent Material Systems and Structures

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Thermoelectric generators (TEGs) have shown great potentials to supply low-power sensor nodes in aerospace applications due to their relatively small size, adequate output power and reliability. TEGs convert waste heat available at aircraft locations into a usable potential difference. However, TEGs’ performance greatly depends on the use of passive cooling systems such as heatsinks to enhance their energy supply. This paper reports the first proof-of-concept use of vapour chambers coupled to traditional circular pin-fin heatsinks to enhance the output power of TEGs. Vapour chambers are compact and small capillary-driven heat spreaders that incorporate a cavity in their volume containing a working fluid to provide a high effective thermal conductivity. Numerical simulations and experimental tests revealed that the use of vapour chambers provided significant increase of the output power, with a maximum produced power of 28.2 W and a relative difference of 6.27 W against conventional energy scavenging configurations. Results demonstrate the high thermal cooling performance of vapour chambers to efficiently support thermal energy harvesting solutions designed for condition and structural health monitoring.

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Section: Theoretical Framework Of Thermoelectric Energy Harvestingmentioning

confidence: 99%

Thermoelectric energy harvesting using vapour chamber coolers for aerospace applications

Sarris

Bhatti

Ciampa

2021

Journal of Intelligent Material Systems and Structures

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“…Anisotropic entire region [10,24,26] Isotropic entire region [11,23,25,27] The entire region divided into the wall region, vapor region, and wick region [12] Due to the small internal space, the phase change simulation of thin aluminum vapor chambers is more difficult. In the actual design of the vapor chambers' heat dissipation system, the thin aluminum vapor chambers are also simplified as the heat pipe.…”

Section: Simplified Models Referencementioning

confidence: 99%

“…In the model, the heat transfer in the wall, the coupled heat and mass transfer at the liquidvapor interface and the fluid flow in the vapor chamber and porous wick were considered. Sobhan et al [21] In recent years, the research on vapor chambers included theoretical research [9][10][11][12], numerical simulation research [9][10][11][12], and experimental research [7,[13][14][15][16][17]. The experimental research focused on the manufacture of new type vapor chambers and the performance testing of vapor chambers, which included the influence of the wick, the working fluid, the charging ratio, the heating power, and tilt angle on the thermal performance of the vapor chambers.…”

Section: Introductionmentioning

confidence: 99%

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Research on a Simplified Model of an Aluminum Vapor Chamber in a Heat Dissipation System

Han

Yang

Tian

et al. 2019

Entropy

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With the rapid increase of power densities of electronic components, the traditional heat dissipation method of air forced convection has reached a heat transfer limit. As efficient phase change heat exchangers, vapor chambers have become an important guarantee for the development of high-power electronic components. Aluminum vapor chambers have become the future development trend because they are more lightweight and less expensive. In order to study the suitable simplified model of the aluminum vapor chamber in the radiating system, the testing system is established to test the thermal characteristics of the vapor chamber. First, six simplified models of the vapor chamber are proposed. Then, the thermal characteristics of the simplified models are simulated by STAR CCM+ software. Next, the error of the thermal resistance of the simplified model and the real vapor chamber is analyzed. Finally, a most suitable simplified model is obtained in the cooling system.

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“…In the wider heat pipes, a two-dimensional heat transport from an evaporator to a condenser section would occur, resulting in a lower thermal resistance between them. This kind of heat pipe is known as a vapor chamber (Mochizuki and Nguyen, 2019;Bulut et al, 2019;Velardo et al, 2019;Huang et al, 2019;Patankar et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Numerical Analyses on Vapor Temperature Drop in an Ultra-Thin Heat Pipe With a Thin Wick Sheet

Koito¹

2021

Frontiers in Heat and Mass Transfer

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Numerical analyses were conducted for an ultra-thin heat pipe in which a thin wick layer was placed on the bottom. The vapor temperature drop caused by vapor flow friction was discussed for two types of the ultra-thin heat pipes with small and large widths. The numerical results were compared with those obtained for an ultra-thin heat pipe with a centered-wick structure. It was confirmed that the vapor temperature drop was reduced effectively by increasing the width of the heat pipe. Therefore, a wider ultra-thin heat pipe, that is, an ultra-thin vapor chamber is a promising option for nextgeneration thermal management.

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On the effective thermal conductivity of the vapour region in vapour chamber heat spreaders

Cited by 20 publications

References 25 publications

Thermoelectric energy harvesting using vapour chamber coolers for aerospace applications

Thermoelectric energy harvesting using vapour chamber coolers for aerospace applications

Research on a Simplified Model of an Aluminum Vapor Chamber in a Heat Dissipation System

Numerical Analyses on Vapor Temperature Drop in an Ultra-Thin Heat Pipe With a Thin Wick Sheet

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