Mathematical modeling of steady-state operation of a loop heat pipe

Bai, Lizhan; Lin, Guiping; Zhang, Hongxing; Wen, Dongsheng

doi:10.1016/j.applthermaleng.2008.12.040

Cited by 88 publications

(37 citation statements)

References 17 publications

(21 reference statements)

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“…A steady-state mathematical model of a loop heat pipe was established and compared with experimental results by Bai et al [6]. The model was able to predict the decreasing length of the condenser two-phase zone under the constant conductance mode caused by the volume expansion of the liquid in the compensation chamber, and was in good agreement with the experimental data.…”

Section: Introductionsupporting

confidence: 63%

Characteristics of Heat Transfer for Heat Pipe and Its Correlation

Mozumder

Chowdhury

Akon

2011

ISRN Mechanical Engineering

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In spite of wide application of heat pipe in microelectronics cooling system, a complete understanding of heat pipe mechanism has not yet been completed. An experimental investigation of heat transfer performance of a heat pipe for dry condition and with three different liquids as acetone, methanol, and water having four fill ratios, for each liquid has been conducted in the present study. The heat pipe was 5 mm in diameter and 150 mm long with a thermal capacity of 10 W. The evaporator and condenser's temperatures were measured with varying input power to estimate the heat transfer coefficient. This study reveals that the dominating parameters for the heat transfer coefficient are evaporator surface temperature, saturated boiling temperature of working fluid, latent heat of vaporization, and fill ratio. The investigation also shows that 85% fill ratio can be regarded as an optimum value for a heat pipe. A new correlation for the heat transfer coefficient has been proposed here which fairly agrees with the experimental results.

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Section: Introductionsupporting

confidence: 63%

Characteristics of Heat Transfer for Heat Pipe and Its Correlation

Mozumder

Chowdhury

Akon

2011

ISRN Mechanical Engineering

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“…[20] developed a steady-state mathematical model of a LHP by considering the evaporator wick as either single-layer or two-layer composite structures, and the condenser having the annular flow pattern. The effects of surface tension of liquid and the interaction between the liquid and vapor phases in the condenser, including both frictional and momentum-transfer shear stresses, were considered.…”

Section: Introductionmentioning

confidence: 99%

“…So far, quite a few studies on the mathematical modeling of LHPs have been conducted, which revealed some working principles and operating characteristics of LHPs [15][16][17][18][19][20][21][22], as briefly reviewed below . Ref.…”

Section: Introductionmentioning

confidence: 99%

Steady-state modeling and analysis of a loop heat pipe under gravity-assisted operation

Bai

Guo

Lin

et al. 2015

Applied Thermal Engineering

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Abstract:In this paper, a steady-state mathematical model of a loop heat pipe (LHP) in gravity-assisted operation has been established based on two driving modes: gravity driven mode and capillarity-gravity co-driven mode. The modeling results show good agreement with experimental data, and the operating characteristics of the LHP under gravity-assisted attitude has been theoretically investigated. When the heat load applied to the evaporator is smaller than the transition heat load, the LHP is operating in the gravity driven mode, the working fluid in the vapor line is in the two-phase state due to the existence of additional liquid mass flow, and the operating temperature is obviously lower than that under horizontal or adverse elevation attitudes caused by reduced heat leak from the evaporator to the compensation chamber and enhanced cooling of the return liquid to the compensation chamber. In addition, the effect of positive elevation on the steady-state operating temperature and thermal conductance of the LHP is analyzed. This study contributes to the comprehensive understanding of the operating principle and characteristics and can guide the design of LHPs in terrestrial surroundings.

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“…These grooves are necessary to transport away the produced vapor. Such grooves cut in the porous material are characteristic to the studies by Chernysheva and Maydanik [7], Bai et al [8] or Hartenstine et al [9]. In order to alleviate that problem the groves were cut inside the tube serving as the casing for evaporator.…”

Section: Experimental Facilitymentioning

confidence: 99%

Investigation of the influence of capillary effect on operation of the loop heat pipe

Mikielewicz¹,

Błauciak²

2014

Archives of Thermodynamics

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In the paper presented are studies on the investigation of the capillary forces effect induced in the porous structure of a loop heat pipe using water and ethanol ad test fluids. The potential application of such effect is for example in the evaporator of the domestic micro-CHP unit, where the reduction of pumping power could be obtained. Preliminary analysis of the results indicates water as having the best potential for developing the capillary effect.

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Mathematical modeling of steady-state operation of a loop heat pipe

Cited by 88 publications

References 17 publications

Characteristics of Heat Transfer for Heat Pipe and Its Correlation

Characteristics of Heat Transfer for Heat Pipe and Its Correlation

Steady-state modeling and analysis of a loop heat pipe under gravity-assisted operation

Investigation of the influence of capillary effect on operation of the loop heat pipe

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