Non equilibrium lumped parameter model for Pulsating Heat Pipes: validation in normal and hyper-gravity conditions

Manzoni, Miriam; Mameli, Mauro; Falco, Carlo de; Araneo, L.; Filippeschi, Sauro; Marengo, Marco

doi:10.1016/j.ijheatmasstransfer.2016.02.026

Cited by 17 publications

(7 citation statements)

References 29 publications

(35 reference statements)

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“…has been used in the simulation work of Holley and Faghri [46] and later, in the simulations of Mameli et al [34] based on a similar approach. More recently, Manzoni et al [65,66] used a slightly different equation (Eq. ( 27) of [65]) that can be rewritten as mḣ v =ṁL.…”

Section: Vapor Energy Equationmentioning

confidence: 99%

“…More recently, Manzoni et al [65,66] used a slightly different equation (Eq. ( 27) of [65]) that can be rewritten as mḣ v =ṁL.…”

Section: Vapor Energy Equationmentioning

confidence: 99%

“…Holley and Faghri [46] and their followers [34,65,[123][124][125] adopt a model where the liquid film covers completely the wall within the vapor bubbles. The film thickness is assumed constant and fixed a priori.…”

Section: Film Modeling In Existing Php Simulationsmentioning

confidence: 99%

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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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Section: Vapor Energy Equationmentioning

confidence: 99%

“…More recently, Manzoni et al [65,66] used a slightly different equation (Eq. ( 27) of [65]) that can be rewritten as mḣ v =ṁL.…”

Section: Vapor Energy Equationmentioning

confidence: 99%

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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 numerical approach, which considers mass, momentum, and energy equations, can not only predict the transient performance of the PHP, but also help researchers to understand the operation mechanism. Several numerical models have been proposed for predicting the heat transfer performance of the PHP, and Table 1 shows the typical numerical models used in the past 10 years for predicting the heat transfer performance of the PHP [6][7][8][9][10][11][12][13][14][15][16]. From Table 1, it could be seen that the numerical models had been improved to get closer to the actual operation of the PHP by considering local pressure losses in the bend [6,14] or the dynamics of the liquid film [13,15] or the heterogeneous and homogeneous phase changes in the PHP [11,15].…”

Section: Introductionmentioning

confidence: 99%

“…Figure 1 shows the coalescence of vapor plugs during visual experiments in our previous work [21]. However, the coalescence of vapor plugs was usually neglected in some numerical models [6][7][8][9][10][11][12][13][14][15][16], and long vapor plugs were hardly simulated in PHPs which made the simulation results on flow characteristics deviate from the actual results. Meanwhile, bubbles were assumed to only generate at particular positions of the PHP [9,10], which affected the pressure distribution in the PHP and further influenced the flow and heat transfer characteristics.…”

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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Simulation and experimental validation of pulsating heat pipes

Rouaze¹,

Marcinichen²,

Cataldo

et al. 2021

Applied Thermal Engineering

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Non equilibrium lumped parameter model for Pulsating Heat Pipes: validation in normal and hyper-gravity conditions

Abstract: ABSTRACT

Cited by 17 publications

References 29 publications

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

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

Simulation and experimental validation of pulsating heat pipes

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