Modeling of a Miniature Loop Heat Pipe with a Flat Evaporator

Delil, A.A.M.; Baturkin, Volodymyr; Gorbenko, Gennadiy O.; Gakal, Pavlo; Ruzaykin, V.

doi:10.4271/2002-01-2506

Cited by 18 publications

(2 citation statements)

References 1 publication

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“…However, the loop was open to the atmosphere preventing to adjust the pressure inside the bench. Delil and Baturkin [8] reproduced a LHP without any liquid line and where the reservoir also plays the role of a condenser in order to reduce its influence on the evaporator behaviour. Since the system is closed and tight, the saturation temperature can be easily modified.…”

Section: Introductionmentioning

confidence: 99%

Effect of the wick characteristics on the thermal behaviour of a LHP capillary evaporator

Giraudon

Lips

Fabrègue

et al. 2018

International Journal of Thermal Sciences

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The present work aims at investigating the effect of the characteristics of porous wicks integrated in a flat diskshaped LHP evaporator on their thermal performance and operating limits. Several wicks were manufactured by sintering of copper powder following a design of experiment, and characterised in terms of permeability, porosity, pore radius and thickness. A specific test bench was designed, consisting of a LHP evaporator uncoupled from the condenser. Water and pentane were used as the working fluids. The theoretical capillary and boiling limits of the wicks in the test bench were studied and compared to the experimental data. It was observed that a high permeable wick (K > 10 -13 m²) is likely to reach the boiling limit before the capillary limit because the fluid easily percolates through it. The heat transfer coefficient between the evaporator wall and the evaporating fluid is significantly higher with pentane than with water. It reaches a maximum value of 2340 W.m -2 .K -1 with water and 5310 W.m -2 .K -1 with pentane, but no clear tendency could be highlighted concerning the effect of the wick characteristics on this parameter. The maximum dissipated heat transfer rate before the wick dry-out varies in a smaller range with pentane than with water. The highest measured values are equal to 88 kW.m -² with water and 56 kW.m -² with pentane.

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Section: Introductionmentioning

confidence: 99%

Effect of the wick characteristics on the thermal behaviour of a LHP capillary evaporator

Giraudon

Lips

Fabrègue

et al. 2018

International Journal of Thermal Sciences

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“…A lot of papers concerning LHP complete modelling can be found in the literature [3][4][5][6]. However, these numerical models often imply complex algorithms and large computational resources which are not always available for upstream pre-design applications.…”

Section: Introductionmentioning

confidence: 99%

Complete analytical model of a loop heat pipe with a flat evaporator

Siedel

Sartre

Lefèvre

2015

International Journal of Thermal Sciences

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International audienceA steady-state analytical model has been developed to determine the thermohydraulic behaviour of a loop heat pipe with a flat evaporator. Its main originality lies in the combination of energy balance equations for each component of the system with 2D analytical solutions for the temperature field in the evaporator. Based on Fourier series expansion, heat transfer in the wick as well as in the evaporator casing are accurately modelled, enabling a thorough consideration of the parasitic heat fluxes. The model is based on the thermal contact resistance between the wick and the casing, the thermal conductivity of the wick and the accommodation coefficient. This analytical method offers a simple solution that can be implemented in LHP design analysis without the need of large computational resources. A sensitivity analysis has been carried out to evaluate the influence of several parameters on the LHP behaviour. The results show that the main parameters of the model are independent. Therefore, they could be experimentally determined using an appropriate test bench with only few temperature measurements. The model has been validated with a set of experimental data from the literature. A good agreement is found between the theoretical and the experimental results

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Experimental study on the thermal performance of a small-scale loop heat pipe with polypropylene wick

Boo

Chung

2005

J Mech Sci Technol

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Modeling of a Miniature Loop Heat Pipe with a Flat Evaporator

Cited by 18 publications

References 1 publication

Effect of the wick characteristics on the thermal behaviour of a LHP capillary evaporator

Effect of the wick characteristics on the thermal behaviour of a LHP capillary evaporator

Complete analytical model of a loop heat pipe with a flat evaporator

Experimental study on the thermal performance of a small-scale loop heat pipe with polypropylene wick

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