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

Bai, Lizhan; Guo, Jinghui; Lin, Guiping; Jiang, He; Wen, Dongsheng

doi:10.1016/j.applthermaleng.2015.03.014

Cited by 30 publications

(17 citation statements)

References 22 publications

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“…For a given heat load and sink temperature, the operating temperature will also keep almost the same. The above trend is similar with the situation in terrestrial gravity reported in reference [16,22,23].…”

Section: Operation At Centrifugal Force Driven Modesupporting

confidence: 91%

“…Based on the principle of LHP operation in gravity [2,16,23], the total pressure drop of the loop includes the viscous pressure drops in vapor groove, vapor line, condenser, liquid line and wick. It is recognized that if the entire loop is not in a horizontal plane, an additional pressure head applies due to gravity and it could increase or decrease the total pressure drop.…”

Section: Operating Principle Under Acceleration Conditionsmentioning

confidence: 99%

“…This has been presented for adverse and positive elevation by numerous experimental and numerical studies. The corresponding operation of the LHP is named of anti-gravity operation and gravity-assisted operation [23,[25][26][27][28].…”

Section: Operating Principle Under Acceleration Conditionsmentioning

confidence: 99%

“…According to the system pressure balance and the energy balance inside the CC, they explained the reasons of the lower operating temperature under the gravity driven mode in detail. Afterwards, they [23] further established a steady-state mathematical model of a LHP under gravity-assisted operation in terms of both driving modes and validated against the experimental data. The variations of transition heat load and mass flow rate, steady-state operating temperature and thermal conductance under various positive elevations were analyzed.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and analytical study of dual compensation chamber loop heat pipe under acceleration force assisted condition

Han

Xie

Zhu

et al. 2020

International Journal of Heat and Mass Transfer

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In this article, a combined experimental and theoretical study has been conducted to investigate the operating characteristics of a dual compensation chamber loop heat pipe (DCCLHP) with ammonia as the working fluid under acceleration force conditions. The DCCLHP with nickel wick consists of a cylindrical evaporator and dual compensation chambers at both ends of evaporator. In the current study, a new DCCLHP test rig was setup which can provide the acceleration up to 11 g. Two types of loading mode were utilized for applying heat load prior to acceleration. The heat load ranges from 25 W to 300 W. Comparisons of operating performance of the DCCLHP were carried out under both gravity and acceleration conditions. A novel centrifugal force assist concept is proposed to address the observed operating behavior.Experimental results show that: (i) the acceleration effect with the proposed orientation could improve the operation performance of the DCCLHP which may operates at the centrifugal force driven mode and capillary-centrifugal force co-driven mode. The operating temperature profile at different heat loads shows "/-shape" oblique line with the increase of the acceleration; (ii) the transition heat load from centrifugal force driven mode to capillary-centrifugal force co-driven mode changes with the variation of acceleration magnitude at both loading modes; (iii) the acceleration effect on the operating temperature is remarkably significant as the heat load is less than 100 W. The operating temperature under acceleration conditions is apparently lower than that under terrestrial gravity; (iv) the coupling change of the loop pressure, vapor-liquid distribution, two-phase flow and heat transfer caused by acceleration effect leads to the unique operation performance of the DCCLHP.

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Section: Operation At Centrifugal Force Driven Modesupporting

confidence: 91%

Section: Operating Principle Under Acceleration Conditionsmentioning

confidence: 99%

Section: Operating Principle Under Acceleration Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental and analytical study of dual compensation chamber loop heat pipe under acceleration force assisted condition

Han

Xie

Zhu

et al. 2020

International Journal of Heat and Mass Transfer

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show abstract

“…A steady-state model introduced by Bai et al [73] is further improved in later publications [74]- [76]. More sophisticated versions of the model include the analysis of the thermal conductivity of compound wicks and the effect of gravity on the evaporator.…”

Section: Chapter 4: Steady-state Modelmentioning

confidence: 99%