Effects of vacuuming process parameters on the thermal performance of composite heat pipes

Li, Yong; Chen, Shengle; He, Bolin; Yan, Yuying; Li, Bo

doi:10.1016/j.applthermaleng.2016.01.035

Cited by 39 publications

(8 citation statements)

References 18 publications

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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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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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“…Before charging, pipes were vacuumed to be lower than 10 Pa in the first vacuum process. The second vacuum process [39,40] was adopted to minimise non-condensable gas. A non-condensable gas gathering section with a length of 80 mm was sealed off after heating the evaporation section in 100 • C for 60 s. The heat pipe performance is affected by many other factors, including non-condensable gas (NCG) [41], charging ratio [42], and groove wick structure [33].…”

Section: Working Fluids Selection and Charging Processesmentioning

confidence: 99%

“…In addition, the optimal inclination angle may be different in various heat loads, even for the same heat pipe. For example, the optimal inclination angles of the acetone heat pipe with heat loads of 40 In order to figure out the mechanism or criteria in determining an optimal inclination angle, the volumetric fraction, α c,a (Equation (22)), which represents a fraction of working fluid in the section of condensation and adiabatic wick, is introduced. Figure 12 plots α c,a as a function of the inclination angle.…”

Section: Liquid Film Profile Of the Mf-ahpasmentioning

confidence: 99%

Thermal Characterisation of Micro Flat Aluminium Heat Pipe Arrays by Varying Working Fluid and Inclination Angle

et al. 2018

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Featured Application: solar collector; solar thermal system; thermal energy storage system; heat exchanger.Abstract: A micro heat pipe array is desirable owing to its high heat transfer capacity, compact size, and high surface-volume ratio compared with conventional heat pipes. In this study, micro flat aluminium heat pipe arrays (MF-AHPA) were developed and systematically characterised by varying working fluid and inclination angle. Three MF-AHPAs with different working fluids, i.e., acetone, cyclopentane, and n-hexane, were fabricated. The acetone MF-AHPA achieved the best thermal performance. The underlying mechanism is the small flow viscous friction and small shearing force of liquid vapour. Additionally, the experimental results show a strong dependence of MF-AHPAs' thermal resistance on the orientation due to the gravitational effect on axial liquid distribution. Finally, a criterion is proposed to determine the optimal inclination angle of the MF-AHPA. In the present study, a volumetric fraction (α a,c ) of 74 ± 7% has been shown to well predict an optimal inclination angle of the MF-AHPAs with various working fluids and heat loads.

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“…The vapor flows in the channels on both sides of the wick structure. The composite wick can reach higher heat flux than the single wick because the composite wick can make more menisci inside the wick than the single wick [21]. The copper foam wick has the advantages of high porosity and large capillary force.…”

Section: Uncertainty Analysismentioning

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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Effects of vacuuming process parameters on the thermal performance of composite heat pipes

Cited by 39 publications

References 18 publications

Thermal Management of Electrified Propulsion System for Low-Carbon Vehicles

Thermal Management of Electrified Propulsion System for Low-Carbon Vehicles

Thermal Characterisation of Micro Flat Aluminium Heat Pipe Arrays by Varying Working Fluid and Inclination Angle

Thermal performance of ultra-thin flattened heat pipes

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