Characterization of evaporator and condenser thermal resistances of a screen mesh wicked heat pipe

Kempers, Roger; Robinson, A.J.; Ewing, D.; Ching, C.Y.

doi:10.1016/j.ijheatmasstransfer.2008.04.001

Cited by 50 publications

(19 citation statements)

References 14 publications

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“…Heat pipes, considered as super thermal conductors, have been widely used in the electronic devices because of their small sizes, light weight structures and excellent heat transfer performance [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Thermal performance of ultra-thin flattened heat pipes

Zhou

Xie

et al. 2017

Applied Thermal Engineering

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This study investigates the thermal performance of composite ultra-thin heat pipes (UTHPs).UTHPs are fabricated by flattening cylindrical heat pipes with outer diameter of 2 mm. The thickness and width were 0.8 mm and 2.7 mm, respectively. The composite wick structure is made of sintered copper foam-mesh wick (CFMW). CFMW combines the good heat transfer performance of copper foam and the high mechanical strength of mesh. The manufacturing process of UTHP was studied and the thermal performance of UTHP samples were investigated experimentally. The results indicate that the optimum filling ratio of UTHPs is 100% and the maximum temperature difference is 3.7 ℃ under the maximum heat transport capacity of 5 W. The thermal resistances of UTHPs increase gradually with the heat power before drying out. Too low or too high filling ratios will reduce the heat transfer efficiency of UTHPs by increasing the thermal resistances. With the optimum filling ratio of 100%, the evaporation thermal resistance of UTHP is found to be 0.29 K/W and the condensation thermal resistance is 0.45 K/W at the heat load of 5 W.

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Section: Introductionmentioning

confidence: 99%

Thermal performance of ultra-thin flattened heat pipes

Zhou

Xie

et al. 2017

Applied Thermal Engineering

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“…A high-performance heat pipe that com bines the principles of thermal conductivity and phase transition to efficiently transfer heat is one of the effective solutions to avoid thermal damage resulting from high temperatures [1,2], Heat pipes are characterized by their overall thermal resistance and their maximum power in various positions and are currently used in many industrial applications. Numerous experimental and theo retical works have studied the structure [3][4][5][6][7][8][9][10][11][12][13][14][15] and geometric properties [16][17][18][19][20][21][22][23] of wicks, both of which affect the heat transfer performance to some extent.…”

Section: Introductionmentioning

confidence: 99%

Evaporation/Boiling Heat Transfer Performance in a Sintered Copper Mesh Structure

Diao

Liu

Zhao

et al. 2014

Journal of Heat Transfer

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In this study, experimental investigations regarding the heat transfer performance of an evaporator with capillary wick are presented. The capillary wick structure is composed o f sintered multilayer copper mesh. The multilayer copper mesh was sintered on the cop per plate. With different combinations of mesh screens, the wick thickness of mesh 140 ranged from 0.6 to l.Omm, and those of meshes 60 and 140160 were both 1.0 mm. The operating pressures used in this study were 0.86 x 10s, 0.91 x 10s, 0.96 x 10s, 1.01 x 10s, and 2.0 x 10s Pa. The experimental results indicate that the heat transfer performance was strongly dependent on the thickness of the sintered mesh structure and on the mesh size. The operating pressure also has a strong influence on the evaporation/boil ing heat transfer performance of a mesh structure sintered using a single mesh size. How ever, it was also observed that the evaporationlboiling heat coefficient increased with an increase in the thickness of the capillary wick structure, which is less than l.Omm. The experimental results further illustrate that the composite sintered mesh structure was capable of properly enhancing the heat transfer performance, especially under high pressure. The maximum enhancement was 31.98%.

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“…When heat is applied at one end of a heat pipe the liquid within it evaporates. The heat transfer rate within the wick structure is extremely high as it is a combination of conduction across a very thin saturated metallic wick and or nucleate boiling [17]. The vapour which is generated at the heated end spreads to the cooled end of the heat pipe.…”

Section: Introductionmentioning

confidence: 99%

Heat pipe-based radiator for low grade geothermal energy conversion in domestic space heating

Kerrigan

Jouhara

O’Donnell

et al. 2011

Simulation Modelling Practice and Theory

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A severe technical drawback of geothermal heat pumps (GHPs) is the fact that the nominal operating temperature available for domestic space heating is typically in the region of 50°C. This is 25°C to 40°C less than conventional boiler settings used in hydronic central heating applications. As a result, GHPs are not generally ideal for direct replacement of conventional hydronic central heating systems because of the low relative distribution temperatures unless extreme measures are taken to improve the thermal insulation of the buildings. A preferable option for GHPs is underfloor heating. In terms of retrofitting existing buildings neither the reinsulating nor the underfloor heating options are attractive due to the large added cost and disruptive nature of the installation. As such, very high performance low temperature radiators that are pluggable into existing hydronic central heating systems are a major enabling technology for this sustainable energy source. In this investigation a Simulation Driven Design technique was utilized to develop a novel low water content and high thermal throughput heat pipe-based radiator. The radiator was subsequently fabricated and tested and showed an exceptionally high power density and very fast response time compared with conventional wet radiators.

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Characterization of evaporator and condenser thermal resistances of a screen mesh wicked heat pipe

Cited by 50 publications

References 14 publications

Thermal performance of ultra-thin flattened heat pipes

Thermal performance of ultra-thin flattened heat pipes

Evaporation/Boiling Heat Transfer Performance in a Sintered Copper Mesh Structure

Heat pipe-based radiator for low grade geothermal energy conversion in domestic space heating

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