Experimental Study of a Reversible Loop Heat Pipe

Kim, Bong-Hun; Peterson, G. P.

doi:10.2514/1.14283

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…To test the predictions of our linear response treatment (Eqs. [14][15][16][17][18][19][20] against full numerical solutions of Eqs. A1-A9 and Eqs.…”

Section: Validity Of Shlhp Linear Responsementioning

confidence: 99%

“…The global design of a subsaturated SHLHP is similar to that of reversible loop heat pipes 20 in which the vapor and liquid paths are separate and there are wick membranes in both the evaporator and condenser. The structure of the condenser and the evaporator can be designed to be identical to one another such that a subsaturated SHLHP could operate upon reversal of a heat flow, for example, due to changes in environmental conditions.…”

Section: Specifics Of Subsaturated Shlhp Designmentioning

confidence: 99%

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Analysis of superheated loop heat pipes exploiting nanoporous wick membranes

2013

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The design and analysis of plant-inspired loop heat pipes (LHPs) that would exploit nanoporous membranes to allow for operation with large capillary pressures and superheated liquid are presented. The operating concepts of this superheated loop heat pipe (SHLHP) resemble the transpiration process in vascular plants: reduction of pressure in leaves drives sap flow up from the roots and overcomes gravity, viscous drag, and reduced chemical potential of water in subsaturated soils. We present a model for steady-state operation and a linear response analysis of both the conventional and superheated designs. Our analysis shows that these SHLHPs could: (1) extend the limitations of conventional LHPs imposed by thermodynamic properties of the working fluid, (2) provide efficient heat transfer over long distances and against large accelerations, and (3) allow for operation in a subsaturated state that would eliminate the thermal resistance and entrainment effect of the liquid film of conventional designs. V C 2013 American Institute of Chemical Engineers AIChE J, 60: [762][763][764][765][766][767][768][769][770][771][772][773][774][775][776][777] 2014

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“…To test the predictions of our linear response treatment (Eqs. [14][15][16][17][18][19][20] against full numerical solutions of Eqs. A1-A9 and Eqs.…”

Section: Validity Of Shlhp Linear Responsementioning

confidence: 99%

Section: Specifics Of Subsaturated Shlhp Designmentioning

confidence: 99%

Analysis of superheated loop heat pipes exploiting nanoporous wick membranes

2013

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“…Although the use of wicks in LHP condensers has been previously reported, the efforts have focused on different issues. For example, Kim and Peterson developed a reversible LHP with a condenser wick, but the wick was integrated as an alternate evaporator wick in the reverse operation [15]. Another study by Muraoka et al reported flooded condenser wicks, with a liquid film on the wick surface [16].…”

Section: Introductionmentioning

confidence: 99%

Development and Characterization of an Air-Cooled Loop Heat Pipe With a Wick in the Condenser

Kariya¹,

Peters²,

Cleary³

et al. 2013

Journal of Thermal Science and Engineering Applications

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Thermal management of modern electronics is rapidly becoming a critical bottleneck of their computational performance. Air-cooled heat sinks offer ease and flexibility in installation and are currently the most widely used solution for cooling electronics. We report the characterization of a novel loop heat pipe (LHP) with a wick in the condenser, developed for the integration into an air-cooled heat sink. The evaporator and condenser are planar (102 mm Â 102 mm footprint) and allow for potential integration of multiple, stacked condensers. The condenser wick is used to separate the liquid and vapor phases during condensation by capillary menisci and enables the use of multiple condensers with equal condensation behavior and performance. In this paper, the thermal-fluidic cycle is outlined, and the requirements to generate capillary pressure in the condenser are discussed. The LHP design to fulfill the requirements is then described, and the experimental characterization of a single-condenser version of the LHP is reported. The thermal performance was dependent on the fan speed and the volume of the working fluid; a thermal resistance of 0.177 C/W was demonstrated at a heat load of 200 W, fan speed of 5000 rpm and fluid volume of 67 mL. When the LHP was filled with the working fluid to the proper volume, capillary pressure in the condenser was confirmed for all heat loads tested, with a maximum of 3.5 kPa at 200 W. When overfilled with the working fluid, the condenser was flooded with liquid, preventing the formation of capillary pressure and significantly increasing the LHP thermal resistance. This study provides the detailed thermal-fluidic considerations needed to generate capillary pressure in the condenser for controlling the condensation behavior and serves as the basis of developing multiplecondenser LHPs with low thermal resistance.

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