Analysis of chaotic flow in a 2D multi-turn closed-loop pulsating heat pipe

Pouryoussefi, S.M.; Zhang, Kun

doi:10.1016/j.applthermaleng.2017.01.097

Cited by 46 publications

(14 citation statements)

References 19 publications

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“…This process repeats itself as long a s there is heat supply from the evaporator section and there is no dry out of working fluid in the PHP. Liquid plugs having abnormal menisci were apparent in the plug edges due to the intensive nucleate boiling and superheated vapor formation [17]. Abnormal menisci could be attributed to small channel diameter used in this study and high heat flux supplied to the evaporator as well.…”

Section: Boundary Conditionsmentioning

confidence: 84%

Numerical Study on the Effects of using Nanofluids in Pulsating Heat Pipe

Zufar

Gunnasegaran²,

Ng³

2018

IJET

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Pulsating Heat Pipe (PHP) is the next generation heat pipe that has a prospect in improving the heat transfer performance. The type of working fluid use in the PHP has a direct influence on the thermal performance. Incorporating nanofluid in PHP may greatly increase its thermal performance as compared to using base fluid (water). The current work focuses on the simulations of 2-dimensional flows in PHP using working fluids such as diamond, silver (Ag), silica oxide (SiO2) nanofluids and water. Constant heat flux and filling ratio of 50% were used throughout the study. From the results, it was found out that diamond nanofluid has the lowest thermal resistance value as compared to other working fluids. The effect of the number of PHP turns was studied and it was discovered that higher number of turns would produce lower thermal resistance value.

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Section: Boundary Conditionsmentioning

confidence: 84%

Numerical Study on the Effects of using Nanofluids in Pulsating Heat Pipe

Zufar

Gunnasegaran²,

Ng³

2018

IJET

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“…Pouryoussefi and Zhang [149,150,151] performed an extensive study of 2,4, and 5-turn PHP configurations in 2D and 3D by VOF. Dry area appearance is described.…”

Section: D and 3d Php Simulationsmentioning

confidence: 99%

Physical principles and state-of-the-art of modeling of the pulsating heat pipe: A review

Nikolayev

2021

Applied Thermal Engineering

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The Pulsating (called also oscillating) Heat Pipe (PHP) is a high performance passive heat transfer device. It consists in a closed capillary channel folded into several meanders, evacuated, and partially filled with a liquid and its vapor. One side is in thermal contact with a hot spot, the other with a cold spot. The oscillation of the liquid plugs and vapor bubbles spontaneously occurs after the heating beginning. The heat exchange takes place not only by latent heat transfer, but also by liquid convection. Both this advantage and the PHP structural simplicity make it competitive with respect to other kinds of heat pipes. However, the PHP operation is non-stationary and depends on many physical and material parameters. As a result, application of empirical correlations is quite unsuccessful. More sophisticated direct modeling is thus required. In this review, we present the past, present, and future perspectives of the theoretical PHP studies. The physical phenomena on the level of a single bubble and single liquid plug is addressed first. In this context, the modeling of the simplest, single branch PHP is described as a necessary first step toward the PHP understanding and model validation. The modeling of interaction between the bubbles and plugs (bubble generation and disappearance, plug evaporation) is discussed next. Finally, the state of the art of the physical modeling and simulation of the multi-turn PHP is reviewed and the difference between existing approaches is explained.

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“…(3) The pressure and the temperature were uniform inside a vapor plug. (4) The friction between vapor plugs and inner wall of the PHP was neglected (5) The vapor plug was enclosed by the liquid film, and the thickness of the liquid film was assumed to be a constant (100 µm).…”

Section: Model Description and Assumptionsmentioning

confidence: 99%

“…However, the thermal-hydraulic behavior of the PHP is complex, and thus it is difficult to predict the thermal performance of the PHP. To date, several approaches have been developed to theoretically investigate the thermal performance of PHP, including artificial neural networks (ANNs) [2,3], computational fluid dynamics (CFD) [4,5], and numerical analysis.…”

Section: Introductionmentioning

confidence: 99%

Transient Numerical Model on the Design Optimization of the Adiabatic Section Length for the Pulsating Heat Pipe

Bao

Zhuang

Gao³

et al. 2021

Applied Sciences

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In the application of pulsating heat pipes (PHPs), the lengths of the adiabatic sections are usually determined by the distance between the heat source and the heat sink, and have important effects on the performance of PHPs. However, there was little research on the effect of the adiabatic section lengths on the performance of PHPs. In this work, a new transient numerical model was proposed to investigate the transient flow and the heat transfer for PHPs with various adiabatic section lengths of 60, 120, 180, and 240 mm. Based on the numerical results, the flow and the heat transfer characteristics of the PHPs were analyzed. It was found that the flow velocities in the PHP with different adiabatic lengths increased with the increase in the heat input, and the mean velocity was calculated to be in the range of 0.139–0.428 m/s, which was consistent with the previous experimental results. The start-up performance of the PHP was better with shorter adiabatic section length. Furthermore, the thermal resistances of the PHPs with different adiabatic section lengths were calculated to analyze the effects of the adiabatic section length on the performance of the PHP. The results showed that when the heat input was 20 W, the PHP with the adiabatic section of 60 mm showed the lowest thermal resistance, whereas the PHP with longer adiabatic section length presented lower thermal resistance at high heat input (≥25 W).

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Analysis of chaotic flow in a 2D multi-turn closed-loop pulsating heat pipe

Cited by 46 publications

References 19 publications

Numerical Study on the Effects of using Nanofluids in Pulsating Heat Pipe

Numerical Study on the Effects of using Nanofluids in Pulsating Heat Pipe

Physical principles and state-of-the-art of modeling of the pulsating heat pipe: A review

Transient Numerical Model on the Design Optimization of the Adiabatic Section Length for the Pulsating Heat Pipe

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