Experimental investigations of flat plate heat pipes with screen meshes or grooves covered with screen meshes as capillary structure

Lefèvre, Frédéric; Conrardy, Jean-Baptiste; Raynaud, M.; Bonjour, Jocelyn

doi:10.1016/j.applthermaleng.2011.11.022

Cited by 66 publications

(21 citation statements)

References 23 publications

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“…On the contrary, the performance of the heat pipe obtained with the association of grooves and meshes (FPHP 3) is not as high as one could expect (Lefèvre et al, 2012) regarding the capillary limit. Indeed, while this capillary structure enables to work in tilted unfavourable position, which was not possible with the grooved heat pipe (FPHP 2), a clear nucleate boiling limitation is observed for rather small heat fluxes (~ 0.4 W/cm²).…”

Section: Fig 12mentioning

confidence: 87%

“…For example, nucleate boiling (Fig. 12) has been observed in various configurations for relatively small heat fluxes (Lips et al, 2009;Lefèvre et al, 2012).…”

Section: Fig 11mentioning

confidence: 99%

“…FPHP 1, shown in Fig. 1, is made of a copper plate of thickness 1.5 mm and surface 267×115 mm² 2012). The capillary structure, of dimensions 230 × 90 mm 2 , is made of one or two CuSn 325 square screen mesh layers.…”

Section: Six Different Flat Plate Heat Pipesmentioning

confidence: 99%

“…Good thermal performance was obtained with FPHP 2 in horizontal and in vertical favorable positions, but it was not able to work in unfavorable tilted position because capillary pressure induced by the grooved capillary structure was too low to overcome the hydrostatic pressure drop in vertical position. In order to overcome this limit, screen meshes were plated against the grooves (Lefèvre et al, 2012) to increase the capillary pressure gradient while preserving the high permeability of the grooves. FPHP 3 is similar to FPHP 2, but the grooves are covered by two layers of meshes (Fig.…”

Section: Six Different Flat Plate Heat Pipesmentioning

confidence: 99%

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Flat Plate Heat Pipes: From Observations to the Modeling of the Capillary Structure

Lefèvre¹,

Lips²,

Rullière³

et al. 2012

Frontiers in Heat Pipes

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This paper presents a synthesis of observations made inside six different flat plate heat pipes (FPHPs). Silicon and copper systems with different capillary structures and sizes are studied. They are hermetically sealed on their upper face with a transparent plate, which enables liquid-vapor interface observations. A confocal microscope is used to measure the liquid film shapes inside the systems and describe the meniscus curvature radius from the evaporator to the condenser. Physical mechanisms, including the boiling limit and the effect of the interfacial shear stress, involved in different capillary structures such as grooves or meshes are discussed. Experimental results are compared to an analytical model describing both the liquid and vapour flows inside the FPHP and coupled to an analytical solution for the wall temperature. The capillary structure is modeled by considering the permeability and the equivalent thermal conductivity of a porous medium. The comparison between the model and the experimental data makes possible the estimation of the physical properties of the capillary structure. These experimental parameters are introduced in the model to estimate the performance of the heat pipe in a real application with several electronic components.

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Section: Fig 12mentioning

confidence: 87%

“…For example, nucleate boiling (Fig. 12) has been observed in various configurations for relatively small heat fluxes (Lips et al, 2009;Lefèvre et al, 2012).…”

Section: Fig 11mentioning

confidence: 99%

Section: Six Different Flat Plate Heat Pipesmentioning

confidence: 99%

Section: Six Different Flat Plate Heat Pipesmentioning

confidence: 99%

See 2 more Smart Citations

Flat Plate Heat Pipes: From Observations to the Modeling of the Capillary Structure

Lefèvre¹,

Lips²,

Rullière³

et al. 2012

Frontiers in Heat Pipes

Self Cite

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show abstract

“…Tang et al [6] and Lefèvre et al [7] have extensively studied the grooved wicks and mesh wicks. Kempers et al [8] studied the effect of number of mesh layers on heat pipe performance.…”

Section: Introductionmentioning

confidence: 99%

A New Approach for Thermo-Fluid Behavior through Porous Layer of Heat Pipes

Nouri-Borujerdi

2017

Scientia Iranica

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This paper developed a new mathematical model to investigate the heat transfer as well as wick thickness of a heat pipe. The model was set up by conservative equations of continuity, momentum and energy in the thermal boundary layer. Using the similarity variable, the governing equations have been changed to a set of ordinary differential equations and they were solved numerically by the forth order Runge-Kutta method. The flow variables such as velocity components, wick thickness and Nusselt number were obtained. The results show that the Nusselt number is proportional to the root square root of the Darcymodified Rayleigh number and that the distance from the edge of the condenser surface. Furthermore, the thickness of the wick material depends on the Jakob number and proportional to the heat transfer between the wall and the liquid film.

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Planar High Temperature Heat Pipes for SOFC/SOEC Stack Applications

2014

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Targeting transient operation of high temperature solid oxide cell (SOC) systems this paper proposes an enhanced heat management mechanism using planar high temperature heat pipes that can be integrated into the SOC‐stack structure. Flat heat pipes with thicknesses down to 4 mm filled with liquid alkali metals for almost isothermal 2D heat spreading, even for intense heat transfer rates, are demonstrated. A new pathway towards a temperature gradient shrinking in SOC‐stacks without using large amounts of additional air‐cooling is shown. The paper will present latest development results on design concepts, size reduced fabrication and filling procedure. An experimental study demonstrates the heat spreading capabilities and power limitations of planar heat spreaders for high temperature applications as in SOEC/SOFC stacks.

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Experimental investigations of flat plate heat pipes with screen meshes or grooves covered with screen meshes as capillary structure

Cited by 66 publications

References 23 publications

Flat Plate Heat Pipes: From Observations to the Modeling of the Capillary Structure

Flat Plate Heat Pipes: From Observations to the Modeling of the Capillary Structure

A New Approach for Thermo-Fluid Behavior through Porous Layer of Heat Pipes

Planar High Temperature Heat Pipes for SOFC/SOEC Stack Applications

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