An investigation of a multi-layered oscillating heat pipe additively manufactured from Ti-6Al-4V powder

Ibrahim, Omar T.; Monroe, J. Gabriel; Thompson, Scott M.; Shamsaei, Nima; Bilheux, Hassina Z.; Elwany, Alaa; Bian, Linkan

doi:10.1016/j.ijheatmasstransfer.2016.12.063

Cited by 56 publications

(15 citation statements)

References 49 publications

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“…In addition, as reported by O.T. Ibrahim et al [27], a working fluid with a low La number correlates to a lower heat transfer capacity. A liquid with a large La number may have better local temperature uniformity if a capillary wick is applied.…”

Section: Evaluation Of the Working Fluidssupporting

confidence: 57%

“…In particular, the effect of orientation on MF-AHPA performance should be quantified, considering their critical roles in determining the efficiency of thermal systems [26]. In addition, working fluids have been known to play a critical role in governing heat pipe performance, no matter whether they are in an oscillating heat pipe [27] or a loop heat pipe [28]. However, study on working fluids on aluminium heat pipes is still insufficient.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Evaluation Of the Working Fluidssupporting

confidence: 57%

Section: Introductionmentioning

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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“…Moreover, the effect of heat generation and heat dissipation under different current ratio is worthy of further study.The heat pipe is a technology of thermal management based on the principle of phase change heat transfer. Flexible geometry, low maintenance requirements and good thermal conductivity make it attractive as a BTMS option [19][20][21], however, the complex manufacturing process and high cost limit the large-scale use of heat pipe [22]. The PCM cooling system uses phase change materials to absorb the heat generated by the battery in the form of latent heat, which has the advantages of excellent uniform temperature effect and large heat storage capacity [23,24], but with the disadvantages of low thermal conductivity and volume change affecting the application and promotion of PCM [25].…”

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confidence: 99%

The Design and Investigation of a Cooling System for a High Power Ni-MH Battery Pack in Hybrid Electric Vehicles

et al. 2020

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Featured Application: Authors are encouraged to provide a concise description of the specific application or a potential application of the work. This section is not mandatory.Abstract: High power cylindrical Ni-MH battery cells have a heavy heat load because of their high discharge rate and large equivalent internal resistance. This heavy heat load, together with an imbalanced flow in parallel liquid cooling systems, can lead to variances in the temperature of each cell in the entire battery pack, thereby reducing the life cycle of the battery pack. In this paper, a parallel-series combined liquid cooling system for a 288V Ni-MH battery pack was designed, and several parameters that influence the flow balance of the system by heat transfer and fluid dynamics were calculated. Then, a thermal-fluid simulation was executed with different parameters using StarCCM+ software, and the simulation results were validated by a battery pack temperature experiment on a bench and in a vehicle. The results indicate that the cell's temperature and temperature differences can be kept within an ideal range. We also determined that within the battery power requirements and structural spacing limits, the total flow rate of the cooling liquid, the cross-sectional area ratio of the main pipe to the branch pipes, and the number of internal supporting walls in each branch pipe need to be large enough to minimize the cell's maximum temperature and temperature differences.reduces the life cycle of a battery pack. At temperatures exceeding 50 • C, charging efficiency and battery life deteriorate the most rapidly due to heat [10,11]. Therefore, it is necessary to pay more attention to the research of battery thermal management system (BTMS), which is very important for battery performance, life and safety. Pesaran et al. [12] noted that Ni-MH and Li-ion batteries' ideal operating temperatures range from 25 to 40 • C, and the temperature differences between the cells within a battery pack should be below 5 • C. Literature ReviewPlenty of works have been done in the field of battery thermal management system for commercially sold EVs and HEVs in the market, such as direct air cooling, liquid cooling, phase change material, heat pipes, hybrid cooling system and other emerging cooling technologies.The air-cooling system uses air as the heat exchange medium to let the air sweep across the battery surface to take away the heat generated by the battery. The air-cooling system is the most widely used cooling mode with simple structure, light weight, low cost and convenient maintenance. Chen YF et al. [13] showed that the thermal conductivity of Li-ion battery was low, and air cooling alone could not meet the requirements of thermal management. Harmel et al. [14] and Chen et al. [15] analyzed the thermal balance of li-ion batteries and found that when the wind speed reached a certain degree, increasing the wind speed had little effect on the heat dissipation effect of the batteries. Nelson et al. [16] have shown that the cooling effect of an air-co...

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“…Different technologies have been used to create reliable monolithic pieces. Ibrahim et al [11] studied the additive manufacture and power bed fusion, presenting the benefits for using emerging additive manufacture technology. The authors obtained satisfactory results applying Ti-6Al-4V powder due to its convenient coefficient of thermal expansion; however, they highlighted the high complexity to modify the channel surface of the final device.…”

Section: Literature Review About Current Fabrication Processmentioning

confidence: 99%

Diffusion-bonded pulsating heat pipes: fabrication study and new channel proposal

Betancur-Arboleda

Hulse

Melian

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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In the present work, diffusion bonding technology used for fabrication of pulsating heat pipes (PHP) in a high-vacuum, highpressure and high-temperature furnace is discussed. Seven different configurations of PHPs were manufactured, subjected to different fabrication parameters. PHPs with 10 and 26 parallel channels of circular and square cross-sectional areas were constructed. In addition, a PHP with a novel cross-sectional channel geometry, composed by a circular area with lateral grooves, which is easily fabricated by the present technology, is proposed. The deformation of the geometries of the channel cross sections was observed. The square channel PHP showed large deformation, while the deformations of the circular ones, including the new proposed geometry, were small. The distribution of the PHPs along the matrix in a single bonding cycle showed to be a very important parameter: Those PHPs produced in parallel presented some deformation and leakage problems, while those made by stacking mode did not presented any leakage. Scanning electron microscopy and optical microscopy were used to assess that diffusion bonding is a very suitable and promising technology for the fabrication of PHPs. The thermal tests showed that the grooved circular channel PHP presents higher thermal performance.

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An investigation of a multi-layered oscillating heat pipe additively manufactured from Ti-6Al-4V powder

Cited by 56 publications

References 49 publications

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

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

The Design and Investigation of a Cooling System for a High Power Ni-MH Battery Pack in Hybrid Electric Vehicles

Diffusion-bonded pulsating heat pipes: fabrication study and new channel proposal

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