Visualization of Thermo-Hydrodynamic Behavior in Flat-Plate Pulsating Heat Pipe with HFE-347

Yan, Lipei; Zhang, Ping; Xu, Hui; Ma, Wei; Sheng, Jiang

doi:10.1007/s11630-021-1409-4

Cited by 8 publications

(2 citation statements)

References 31 publications

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“…In this context, some efforts are performed in the literature [2,3]. Also, cooling of LED chips or CPUs [4,5], and practices in solar and cryogenic fields [6,7] are among the other examples for utilization of PHPs. Other reason can be linked to working principle of the PHPs.…”

Section: Introductionmentioning

confidence: 99%

Thermo-Fluidic Analysis of Pulsating Heat Pipes Charged with Water-Based Immiscible Fluid Pairs

MARKAL,

VAROL

2024

Düzce Üniversitesi Bilim Ve Teknoloji Dergisi

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Immiscible fluids may provide operational flexibility for pulsating heat pipes (PHPs) due to thermo-hydrodynamic diversity lead by each pure component. In this regard, present paper focuses on the thermo-fluidic analysis of non-uniform pulsating heat pipes charged with water-based immiscible fluid pairs. Research parameters cover gravity effect via the inclination angles (IA) of 0o and 90o, and fluid pair effect via two different water-based immiscible binary fluids as Water (W) – Hexane (H), and Water (W) – Pentane (P). The volumetric mixing ratios are W:H=1:1, 1:4, 4:1, 1:0, 0:1, and W:P=1:1, 1:4, 4:1, 1:0, 0:1; and the non-uniform flat plate type pulsating heat pipe (FP-CLPHP) has alternating-sequence parallel channels. The experiments are performed at the filling ratio of 40% (FR=40%), and flow phenomena is visualized. As some conclusions; at vertical orientation, the FP-CLPHPs having binary fluids of water-pentane show better thermal performance compared to the pure counterparts. Especially, the heat transfer characteristics of W:P=1:1 are the best ones among all the pure and binary fluids. On the other hand, as a conclusion of combination of non-uniform design and suitable thermophysical properties, the FP-CLPHPs charged with pure pentane, pure hexane or binary fluid of W:P=1:4 can work independent from gravitational force.

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Section: Introductionmentioning

confidence: 99%

Thermo-Fluidic Analysis of Pulsating Heat Pipes Charged with Water-Based Immiscible Fluid Pairs

MARKAL,

VAROL

2024

Düzce Üniversitesi Bilim Ve Teknoloji Dergisi

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“…They compared the flow patterns and heat-transfer performances of both PHPs. Lipei et al (2021) prepared flat-plate PHP made of aluminum with HFE-347 as working fluid. They investigated the effect of filling ratio on its flow pattern and heat-transfer performance.…”

Section: Introductionmentioning

confidence: 99%

Comparison of heat-transfer performance of a flat-plate pulsating heat pipe based on heating orientation and cross-sectional shape of the pipe

Yasuda

Nabeshima

Horiuchi

et al. 2023

Mechanical Engineering Journal

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The effects of cross-sectional shapes of flat-plate pulsating heat pipes (PHPs) on heat-transfer performance were experimentally investigated. The flat-plate PHP, made of aluminum alloy, has a closed-end serpentine channel with 22 turns. Four PHP samples with different channel shape (square or circular), the hydraulic diameter of the channel (1 or 1.2 mm), and plate thickness (3 or 2 mm) were prepared. The working fluid in the channel is R1336mzz(Z), and its filling ratio was increased from 30 mass% to 70 mass% in increments of 10 mass%. The heating section of the PHP is heated at power from 20 to 180 W in one of three heating orientations (vertical bottom, top, and horizontal) and the cooling section of the PHP is kept at 40 °C. Equivalent thermal conductivity is calculated from temperature on the surface of the PHP and heat transport rate. The experimental results indicate that the larger the cross-sectional area of the channel-wall material, the more likely it is that working-fluid oscillation will occur in the case of the top and horizontal heating orientations. Within the scope of this study, The PHP sample with a 1.2×1.2-mm square channel, the thickness of 3 mm, and filling ratio of 40 mass% has the highest equivalent thermal conductivity, namely, 2880 W/(m･K) at heat-transport rate Q of 146 W in topheating orientation, 2750 W/(m･K) at Q = 146 W in horizontal-heating orientation, and 6540 W/(m･K) at Q = 36 W in bottom-heating orientation. As for that PHP, when Q is 80 W or more, equivalent thermal conductivities are the same regardless of heating orientation. It is thus considered that under that condition, working-fluid behaviors of the PHP become equivalent regardless of the heating orientation.

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Recent advances in visualization of pulsating heat pipes: A review

Zheng

et al. 2023

Applied Thermal Engineering

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Visualization of Thermo-Hydrodynamic Behavior in Flat-Plate Pulsating Heat Pipe with HFE-347

Cited by 8 publications

References 31 publications

Thermo-Fluidic Analysis of Pulsating Heat Pipes Charged with Water-Based Immiscible Fluid Pairs

Thermo-Fluidic Analysis of Pulsating Heat Pipes Charged with Water-Based Immiscible Fluid Pairs

Comparison of heat-transfer performance of a flat-plate pulsating heat pipe based on heating orientation and cross-sectional shape of the pipe

Recent advances in visualization of pulsating heat pipes: A review

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