Flat plate pulsating heat pipes: A review on the thermohydraulic principles, thermal performances and open issues

Ayel, Vincent; Slobodeniuk, Maksym; Bertossi, Rémi; Romestant, Cyril; Bertin, Yves

doi:10.1016/j.applthermaleng.2021.117200

Cited by 53 publications

(21 citation statements)

References 82 publications

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“…In particular, the terms related to the two space directions y and z, i.e. 𝑞𝑞 𝑧𝑧 = −𝑘𝑘 𝜕𝜕 2 𝑠𝑠, while the heat dissipated towards the environment 𝑞𝑞 𝑒𝑒𝑒𝑒𝑒𝑒 = ℎ 𝑒𝑒𝑒𝑒𝑒𝑒 (𝑇𝑇 − 𝑇𝑇 𝑒𝑒𝑒𝑒𝑒𝑒 ) was found to be negligible with respect to the other terms for every test case. It must be pointed out that, as suggested by Cattani et al [13] and Pagliarini et al [14] for tubular PHPs, the storage term is capable of providing some information about the fluid motion inside the device, even without a direct fluid visualization.…”

Section: Methods Validation and Application To Experimental Datamentioning

confidence: 92%

“…In particular, the latter, may be effectively adopted in such applications where an optimal thermal contact between the cooled section and FPPHPs is required or when compactness coupled with structural reliability are necessary. The most promising fields of application are represented by standard and micro-electronics cooling, thermal management of batteries in the automotive field and space applications [2]. Although FPPHPs have been already intensively studied in terms of global performance, i.e.…”

Section: Introductionmentioning

confidence: 99%

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Study on the local heat transfer behaviour in a flat plate pulsating heat pipe

Pagliarini

Cattani

Bozzoli

et al. 2022

J. Phys.: Conf. Ser.

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A closed-loop Flat Plate Pulsating Heat Pipe, filled with a water-ethanol mixture (filling ratio = 50% vol.), is tested in horizontal orientation at different heat loads to assess local wall-to-fluid heat fluxes exchanged within its adiabatic section. In addition, the thermal interactions between adjacent channels are investigated since they could be responsible for poorer thermal performances in such kinds of cooling systems. The studied device is obtained from a copper plate (width: 80 mm, length: 200 mm, thickness: 3.5 mm) machined with a single square shaped groove (3 x 3 mm2) forming a series of 8 turns in the evaporator zone and covered with a second copper plate having same length and width, and thickness equal to 0.5 mm. During the Flat Plate Pulsating Heat Pipe operation, the temperature of the external wall, coated with a high-emissivity paint, is monitored within the whole adiabatic section by an InfraRed camera during the pseudo-steady state. The thermographic measurements are post-processed by adopting the Inverse Heat Conduction Problem resolution approach, adequately validated by numerical simulations. The resulting wall-to-fluid heat fluxes are studied in terms of amplitude and oscillation, thus providing novel pieces of information regarding the working behaviour of Flat Plate Pulsating Heat Pipes in terms of oscillatory flow and thermal interactions by conduction between adjacent channels.

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Section: Methods Validation and Application To Experimental Datamentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Study on the local heat transfer behaviour in a flat plate pulsating heat pipe

Pagliarini

Cattani

Bozzoli

et al. 2022

J. Phys.: Conf. Ser.

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“…To determine the value of r cut−o f f , two auxiliary minimization problems are defined in Equations ( 17) and ( 18), varying one parameter at a time, while tending the other to infinity. In other words, the filter is first applied to space only in Equation (17), and therefore to time only in Equation (18), thus treating the two physics separately as in previous works [41,43].…”

Section: Local Heat Flux Estimation Proceduresmentioning

confidence: 99%

“…Other works attempted a more precise description of the internal FPPHP operation by means of direct fluid visualizations. In fact, FPPHPs are suitable for simultaneous visualizations of the fluid flow in every channel by utilizing transparent windows, i.e., by using sheets of glass or polymeric materials [18], with a rather low manufacturing effort. Such direct visualizations lead to interesting thermo-fluid dynamics considerations, which give a deeper insight into the heat transfer behavior of FPPHPs in terms of bubble generations, liquid-vapor interface evolution and liquid/vapor location inside either the evaporator or the condenser sections.…”

Section: Introductionmentioning

confidence: 99%

Novel Infrared Approach for the Evaluation of Thermofluidic Interactions in a Metallic Flat-Plate Pulsating Heat Pipe

et al. 2022

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A novel and advanced analysis tool, based on the resolution of the inverse heat conduction problem, is used to evaluate wall-to-fluid heat fluxes in a metallic flat-plate pulsating heat pipe. The device under analysis is made of copper and formed by 16 channels having a squared section of 3 × 3 mm2 and filled with a water–ethanol mixture (20 wt.% of ethanol) with a volumetric filling ratio of 50%. One flat side of the device is externally coated with a highly emissive paint to perform temperature measurements by means of a medium-wave infrared camera. The acquired infrared maps are first processed by a three-dimensional Gaussian filter and then used as inputs for the inverse approach for the evaluation of heat fluxes locally exchanged between the fluid and the thin walls of each channel. The suggested procedure is successfully validated by means of synthetic data. The resulting space–time heat flux distributions are therefore statistically investigated in terms of amplitude and space–time variations, providing quantitative references for the identification of two-phase flow regimes. These unique data give an evaluation of the local heat transfer behavior, which is essential to provide empirical values for the numerical models of pulsating heat pipes.

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“…As thoroughly explained by Ayel et al [30] in their very exhaustive review paper on FPPHPs published in this special issue, this assessment offers the opportunity to develop peculiar geometries especially tailored for the thermal management problem thanks to the emerging additive manufacturing techniques. Furthermore, it is more suitable than the tubular assessment in terms of miniaturization [31].…”

Section: Flat Plate Pulsating Heat Pipesmentioning

confidence: 99%