Thermal performance of ultra-thin flattened heat pipes with composite wick structure

Li, Yong; Zhou, Wenjie; He, Junlin; Yan, Yuying; Li, Bo; Zeng, Ziqian

doi:10.1016/j.applthermaleng.2016.03.097

Cited by 114 publications

(18 citation statements)

References 21 publications

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“…The porosity of the CFMW was calculated by soaking the wick into deionized water until it become saturated [5]. The porosity of wick is defined by:…”

Section: Methodsmentioning

confidence: 99%

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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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“…The porosity of the CFMW was calculated by soaking the wick into deionized water until it become saturated [5]. The porosity of wick is defined by:…”

Section: Methodsmentioning

confidence: 99%

“…Because the spaces of the electronic devices for heat dissipation are limited, heat pipes are usually flattened before applied [5]. Flattened heat pipes have been designed for high heat flux occasions and widely used in the narrow space of thermal control components [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Thermal performance of ultra-thin flattened heat pipes

Zhou

Xie

et al. 2017

Applied Thermal Engineering

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“…Moreover, vapour chamber can be integrated in many heat sinks such as pin fin structure. Li et al and Wang et al [90][91][92][93][94][95] conducted many research on vapour chamber and heat pipe with respect to wick structure and ultra-thin flattened heat pipes. Avenas et al [96], Chen et al [97], Qi et al [98] and Hose [99] developed a power module with vapour chamber heat spread.…”

Section: Cutting-edge Power Electronic Cooling Solutionsmentioning

confidence: 99%

Thermal Management of Electrified Propulsion System for Low-Carbon Vehicles

Huang

Wang

et al. 2020

Automot. Innov.

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An overview of current thermal challenges in transport electrification is introduced in order to underpin the research developments and trends of recent thermal management techniques. Currently, explorations of intelligent thermal management and control strategies prevail among car manufacturers in the context of climate change and global warming impacts. Therefore, major cutting-edge systematic approaches in electrified powertrain are summarized in the first place. In particular, the important role of heating, ventilation and air-condition system (HVAC) is emphasised. The trends in developing efficient HVAC system for future electrified powertrain are analysed. Then electric machine efficiency is under spotlight which could be improved by introducing new thermal management techniques and strengthening the efforts of driveline integrations. The demanded integration efforts are expected to provide better value per volume, or more power output/torque per unit with smaller form factor. Driven by demands, major thermal issues of high-power density machines are raised including the comprehensive understanding of thermal path, and multiphysics challenges are addressed whilst embedding power electronic semiconductors, non-isotropic electromagnetic materials and thermal insulation materials. Last but not least, the present review has listed several typical cooling techniques such as liquid cooling jacket, impingement/spray cooling and immersion cooling that could be applied to facilitate the development of integrated electric machine, and a mechanic-electric-thermal holistic approach is suggested at early design phase. Conclusively, a brief summary of the emerging new cooling techniques is presented and the keys to a successful integration are concluded.

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“…They mainly contain a metal shell, wick structures, phase-change chamber, and working fluid. In general, the wick structure of a heat pipe can be divided into three types: groove type [3][4][5][6], copper powder sintering type [7][8][9], and compound type with groove, copper powder or other foam and mesh materials [10,11], as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Thermal Performances Investigation of Anti-Gravity Heat Pipe with Tapering Phase-Change Chamber

et al. 2020

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The objective of this study was to fabricate anti-gravity heat pipes with a tapering column phase-change chamber and changeable cross-sectional wick structure. The thermal performances of the anti-gravity heat pipes were experimentally investigated. Results show that the thermal resistances of the different heat pipes are less than 0.03 °C/W, except for the sharp conical chamber heat pipe under anti-gravity heating conditions (0.121 °C/W). Start-up times of different types of heat pipes are similar and the temperatures are steady within 3 to 5 min. The heat transfer ability of a conical chamber is always better than that of a cylindrical one. The performance of the sharp conical chamber heat pipe is the best under gravity assistance heating conditions. Contrarily, the blunt conical chamber heat pipe has the best heat transfer ability under anti-gravity heating conditions. Moreover, the heat transfer capability of the blunt conical chamber heat pipe is unaffected by the relative position of the heat and cold sources, which is suitable for constant temperature cooling applications with frequent switching of the heat and cold sources.

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Thermal performance of ultra-thin flattened heat pipes with composite wick structure

Cited by 114 publications

References 21 publications

Thermal performance of ultra-thin flattened heat pipes

Thermal performance of ultra-thin flattened heat pipes

Thermal Management of Electrified Propulsion System for Low-Carbon Vehicles

Thermal Performances Investigation of Anti-Gravity Heat Pipe with Tapering Phase-Change Chamber

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