Application of an anti-gravity oscillating heat pipe on enhancement of waste heat recovery

Liu, Xiangdong; Han, Xiaotian; Wang, Zhaoyu; Gao, Huai; Zhang, Ziwen; Chen, Yongping

doi:10.1016/j.enconman.2019.112404

Cited by 47 publications

(12 citation statements)

References 35 publications

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“…The use of PHP heat exchangers in air conditioning systems can reduce energy consumption to 14% [57]. Liu et al [58] applied anti-gravity PHP to waste heat recovery. The test results showed that the heat recovery efficiency of anti-gravity PHP (AGPHP) was more than 1.66 times that of pure copper rods.…”

Section: Energy Saving With Excellent Heat Transfer Performancementioning

confidence: 99%

Micro-Channel Oscillating Heat Pipe Energy Conversion Approach of Battery Heat Dissipation Improvement: A Review

Xin

Zhu

2022

Energies

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The application of batteries has become more and more extensive, and the heat dissipation problem cannot be ignored. Oscillating Heat Pipe (OHP) is a good means of heat dissipation. In this paper, the methods to improve the energy conversion and flow thermal performance of micro-channel OHP are studied and summarized. The working principle, heat transfer mechanism, advantages and applications of PHP are also introduced in detail in this study. Proper adjustment of the micro-channel layout can increase the heat transfer limit of PHP by 44%. The thermal resistance of two-diameter channel PHP is 45% lower than that of conventional PHP. The thermal resistance of PHP under uneven heating can be reduced to 50% of the original. PHP pulse heating can alleviate the phenomenon of dryness. Different working fluids have different effects on PHP. The use of graphene nano-fluids as the work medium can reduce the thermal resistance of PHP by 83.6%. The work medium obtained by the mixture of different fluids has the potential to compensate for the defects while inheriting the advantages of a single fluid.

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Section: Energy Saving With Excellent Heat Transfer Performancementioning

confidence: 99%

Micro-Channel Oscillating Heat Pipe Energy Conversion Approach of Battery Heat Dissipation Improvement: A Review

Xin

Zhu

2022

Energies

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“…An observation conducted by a naked eye or a normal camera may lead misunderstanding since reverse flow having short periods cannot be detected. On the other hand, physical reasons of decrease in thermal resistance with increasing heat load are (1) increase in circulation rate depending on improving thermal driving force [28,29] and (2) emerging relevant flow patterns or bubble dynamic effects. From this aspect, an analysis can be conducted based on the results obtained at E/P = 1:3, FR = 30% and IA = 90°.…”

Section: Effects Of Mixing Ratio and Heat Loadmentioning

confidence: 99%

Thermal investigation and flow pattern analysis of a closed-loop pulsating heat pipe with binary mixtures

Markal

Varol

2020

J Braz. Soc. Mech. Sci. Eng.

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The present study basically examines thermal performance and relevant flow phenomena of a flat plate closed-loop pulsating heat pipe (FP-CLPHP) filled with binary mixtures. The heat pipe has eight turns, each of which consisting of asymmetrical channel pairs having cross sections as 2 mm × 2 mm and 1 mm × 2 mm (width × height). Binary mixtures are generated as mixtures of ethanol (E) and pentane (P) with different mixing ratios. Mainly, effects of volume mixing ratio (E/P = 1:1, 1:3 and 3:1), vertical (90°) and horizontal orientation (0°) and filling ratio (30% and 60%) on thermal characteristics are investigated under different heat inputs. For examination of flow dynamics, images are obtained by using a high-speed camera at 1000 fps. The results show that variation of volumetric percentage of each component significantly changes thermal performance. Increasing pentane in the mixture improves the thermal performance, such that heat pipe with mixing ratio of E/P = 1:3 can properly operate even at horizontal position. On the other hand, increasing volume of ethanol in mixture leads to collapse of the FP-CLPHP at both orientations (0° and 90°). Generally, the filling ratio of 30% shows better thermal performance. Complex bubble-liquid interactions and dynamics play critical roles on thermal characteristics. Two novel characteristic phenomena are identified for non-uniform PHPs: (1) flooding phenomenon and (2) asymmetrical rapid bubble growth phenomenon. Keywords Thermal performance • Flow visualization • Bubble dynamics • Heat pipe List of symbols A bi Bubble interface area (m 2) A app Shear force acting area (m 2) D h Hydraulic diameter (m) Q i Heat input (W) Q rh Removed heat via cooling water (W) R th Total thermal resistance (°C W −1) T Temperature (°C) Greek symbols Angle between the heat pipe and horizontal position (°) Dynamic viscosity (Pa s)

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“…Among them, the oscillating heat pipe, which functions via a thermally excited oscillating motion, was considered one of the most promising methods to solve the problem of compact heat dissipation based on its high thermal performance, simple construction, and small size [ 13 , 14 , 15 ]. Currently, OHPs have demonstrated quite promising potential for many applications in electronic cooling [ 16 , 17 ], aerospace [ 18 ], waste heat recovery [ 19 ], solar energy [ 20 ], and other important industrial fields [ 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Thermal Performance of a Polymer-Based Flexible Oscillating Heat Pipe via 3D Printing Technology

Han

Chang

2023

Polymers

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As flexible electronic technologies rapidly developed with a requirement for multifunction, miniaturization, and high power density, effective thermal management has become an increasingly important issue. The oscillating heat pipe, as a promising technology, was used to dissipate high heat fluxes and had a wide range of applications. In this paper, we reported the fabrication and heat transfer performance evaluation of a polymer-based flexible oscillating heat pipe (FOHP) prepared using 3D printing technology. The 3D-printed inner surface presented excellent wettability to the working fluid, which was beneficial for the evaporation of the working fluid. Ethanol was selected as the working fluid, and the influence of the filling ratios range of 30–60% on heat transfer performance was analyzed. It was found that a 3D-printed FOHP with a filling ratio of 40% presented the best heat transfer performance with the lowest thermal resistance, and the fabricated heat pipes could be easily bent from 0° to 90°. With the best filling ratio, the thermal resistance of the FOHPs increased with larger bending angles. In addition, the 3D-printed FOHP was successfully applied for the thermal management of flexible printed circuits, and the results showed that the temperature of flexible printed circuits was kept within 72 °C, and its service life was guaranteed.

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Application of an anti-gravity oscillating heat pipe on enhancement of waste heat recovery

Cited by 47 publications

References 35 publications

Micro-Channel Oscillating Heat Pipe Energy Conversion Approach of Battery Heat Dissipation Improvement: A Review

Micro-Channel Oscillating Heat Pipe Energy Conversion Approach of Battery Heat Dissipation Improvement: A Review

Thermal investigation and flow pattern analysis of a closed-loop pulsating heat pipe with binary mixtures

Fabrication and Thermal Performance of a Polymer-Based Flexible Oscillating Heat Pipe via 3D Printing Technology

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