Condensation, evaporation and boiling of falling films in wickless heat pipes (two-phase closed thermosyphons): A critical review of correlations

Guichet, Valentin; Jouhara, Hussam

doi:10.1016/j.ijft.2019.100001

Cited by 43 publications

(15 citation statements)

References 98 publications

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“…A heat pipe (HP) is a highly efficient heat transfer device mainly made of a hermetically sealed evacuated tube containing a small amount of working medium. The phase change process of the medium is used in the HP to transfer a large amount of heat; a large amount of heat can be transferred with a small temperature difference [2] and is called a thermal superconductor or thermal "short-circuits" [3].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Liquid–Liquid Heat Pipe Heat Exchanger Based on a Novel Model

et al. 2021

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Heat pipe heat exchangers (HPHEXs) are widely used in various industries. In this paper, a novel model of a liquid–liquid heat pipe heat exchanger in a countercurrent manner is established by considering the evaporation and condensation thermal resistances inside the heat pipes (HPs). The discrete method is added to the HPHEX model to determine the thermal resistances of the HPs and the temperature change trend of the heat transfer fluid in the HPHEX. The established model is verified by the HPHEX structure and experimental data in the existing literature and demonstrates numerical results that agree with the experimental data to within a 5% error. With the current model, the investigation compares the effectiveness and minimum vapor temperature of the HPHEX with three types of HP diameters, different mass flow rates, and different H* values. For HPs with a diameter of 36 mm, the effectiveness of each is improved by about 0.018 to 0.029 compared to HPs with a diameter of 28 mm. The results show that the current model can predict the temperature change trend of the HPHEX well; in addition, the effects of different structures on the effectiveness and minimum vapor temperature are obtained, which improve the performance of the HPHEX.

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Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Liquid–Liquid Heat Pipe Heat Exchanger Based on a Novel Model

et al. 2021

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“…Film-wise condensation was assumed to be taking place in the model of this heat pipe. The Nusselt heat transfer coefficient is the most used to predict condensation heat transfer coefficients in laminar and wavy-laminar films [26]. Thus, in this model, the Nusselt correlation for condensation was selected to calculate h c , as shown in Equation ( 8) for the heat transfer analysis in the of the ground-source heat pipe.…”

Section: Comparison With Theoretical Potential For Heat Transfermentioning

confidence: 99%

Evaluating Groundwater Flow Effects for Enhancement of Ground-Source Heat Pipes in the Case of the Toyohira River Alluvial Fan, Japan

Sakata

Chishimba

Mochizuki³

et al. 2021

Hydrology

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The purpose of this study was to evaluate the potential enhancement of ground-source heat pipes by groundwater advection at two sites within an alluvial fan of Toyohira River, Sapporo. Two sites were selected: one in the fan toe, for negligible groundwater flow (Site 1), and the other in the apex for fast flows, the latter characterized by a specific discharge of 1.0 m/d from the losing river (Site 2). The evaporator section(s) of a single (double) heat pipe(s) was installed in a borehole at each site; the condenser section(s) on the ground was placed inside cooled brine at a set temperature, resulting in heat extraction under steady conditions. The single heat pipe experiments showed that the heat extraction rates ranged between 0.23 and 0.79 kW and were not clearly different at the two sites, considering some uncertainty. For double heat pipes, the heat extraction rates were unchanged at Site 1, but were about 146% higher at Site 2 compared to the single tests, due to groundwater advection. This study revealed that the number of ground-source heat pipes required could be reduced from three to two in areas near Site 2.

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“…Characteristic examples of the former may involve the motion of lava flows (Balmforth et al 2006), debris flow (Allouche et al 2017) and biofilms (Kumar et al 2013). Regarding technological applications, they typically involve coating in microelectronics (Stillwagon & Larson 1990;Kistler & Schweizer 1997), industrial heat and mass transfer applications (Sisoev, Matar & Lawrence 2005;Guichet & Jouhara 2020), distillation columns (Battisti, Machado & Marangoni 2020) and falling film reactors (Yeong et al 2006). In practice, the substrates are frequently rough, either intentionally or accidentally, due to the presence of cavities, pillars, corrugations, or arrested particles and drops on them.…”

Section: Introductionmentioning

confidence: 99%

“…2013). Regarding technological applications, they typically involve coating in microelectronics (Stillwagon & Larson 1990; Kistler & Schweizer 1997), industrial heat and mass transfer applications (Sisoev, Matar & Lawrence 2005; Guichet & Jouhara 2020), distillation columns (Battisti, Machado & Marangoni 2020) and falling film reactors (Yeong et al . 2006).…”

Section: Introductionmentioning

confidence: 99%

Stability analysis of viscoelastic film flows over an inclined substrate with rectangular trenches

et al. 2021

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Condensation, evaporation and boiling of falling films in wickless heat pipes (two-phase closed thermosyphons): A critical review of correlations

Cited by 43 publications

References 98 publications

Numerical Analysis of Liquid–Liquid Heat Pipe Heat Exchanger Based on a Novel Model

Numerical Analysis of Liquid–Liquid Heat Pipe Heat Exchanger Based on a Novel Model

Evaluating Groundwater Flow Effects for Enhancement of Ground-Source Heat Pipes in the Case of the Toyohira River Alluvial Fan, Japan

Stability analysis of viscoelastic film flows over an inclined substrate with rectangular trenches

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