Effect of evaporator tilt on the operating temperature of a loop heat pipe without a secondary wick

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

doi:10.1016/j.ijheatmasstransfer.2014.05.044

Cited by 21 publications

(4 citation statements)

References 34 publications

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“…Another noteworthy phenomenon was that the increase of evaporator outlet temperature caused by adverse tilt in this paper was only about 7 C (as illustrated by Fig. 9), which was much lower than that in Ref [20]. This might be related to the installation of secondary wick in evaporator core and CC.…”

Section: Horizontal Attitude ( =0)mentioning

confidence: 57%

“…Recently, LHP technology has been developed for aircraft applications and the gas/liquid distribution in LHP would be affected significantly by gravity, which is quite different from the case in space [19,20]. It seems that the relative position between evaporator and CC has much great impacts on the performance of LHP because the tilt of evaporator could change the heat and mass transfer process in evaporator and CC significantly.…”

Section: Introductionmentioning

confidence: 99%

“…So far, there has been some literature that reported the effect of evaporator tilt on LHP performance. Ref [20] investigated the operating temperature of a LHP without secondary wick under terrestrial surroundings experimentally. The evaporator tilt was found to have a significant effect on the operating temperature of LHP.…”

Section: Introductionmentioning

confidence: 99%

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Effect of evaporator tilt on a loop heat pipe with non-condensable gas

Wang

Lin

Shen

et al. 2019

International Journal of Heat and Mass Transfer

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ReuseThis article is distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs (CC BY-NC-ND) licence. This licence only allows you to download this work and share it with others as long as you credit the authors, but you can't change the article in any way or use it commercially. More information and the full terms of the licence here: https://creativecommons.org/licenses/ Abstract: The coupling effect of non-condensable gas (NCG) and evaporator tilts on the steady state operation of a loop heat pipe (LHP) was investigated both experimentally and theoretically in this work. Nitrogen was injected quantitatively into an ammonia-stainless steel LHP to simulate NCG, and the steady state characteristics of the LHP were studied under three typical evaporator tilts. According to the experimental results, the main conclusions below can be drawn. (1) The temperature is the highest under adverse tilt and the lowest under favorable tilt no matter whether there is NCG in LHP. (2) The existence of NCG could cause the increase of temperature under all three typical evaporator tilts, but the temperature increment caused by NCG seems to be relatively small under adverse tilt. (3) The increments of the temperature caused by NCG display different patterns under different tilts. Theoretical analysis was conducted to explain the results: the temperature under the coupling effect of NCG and evaporator tilt was determined by the energy balance between the heat leak from evaporator to compensation chamber and the cooling capacity of returning subcooled liquid. With the increase of heat load, the augmentation of heat leak caused by NCG and the enhancement of subcooled liquid cooling effect were incongruent. The coupling effect of NCG and evaporator tilts should be considered in the terrestrial application of LHP.

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Section: Horizontal Attitude ( =0)mentioning

confidence: 57%

Section: Introductionmentioning

confidence: 99%

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Effect of evaporator tilt on a loop heat pipe with non-condensable gas

Wang

Lin

Shen

et al. 2019

International Journal of Heat and Mass Transfer

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“…The tilt of evaporator changes the relative height of evaporator and CC, which affects the liquid-vapor distribution and heat transfer in CC. Since the operating temperature is usually determined by the energy balance of CC [1], the evaporator tilt will eventually have a significant impact on the LHP operating characteristics, as reported by Ref [15]. Besides, the elevation of evaporator or condenser also has a great effect on the LHP operation because of the action of liquid head in the gravitational field [14,16].…”

Section: Introductionmentioning

confidence: 96%

Effect of evaporator/condenser elevations on a loop heat pipe with non-condensable gas

Wang

Lin

Shen

et al. 2020

Applied Thermal Engineering

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The coupling effect of evaporator/condenser elevations and non-condensable gas (NCG) on the performance of a loop heat pipe (LHP) operating in gravitational field was investigated experimentally. Ammonia and nitrogen were selected as the working fluid of LHP and the simulated gas of NCG, respectively. The experiments were conducted at three kinds of evaporator/condenser elevations, namely zero elevation, adverse elevation and positive elevation. Experimental results show that NCG will cause an increase in operating temperature, but the trends varies at different evaporator/condenser elevation elevations. The temperature rises caused by NCG at the zero and adverse elevations are negatively correlated with heat load, and the maximum temperature increments are both at the minimum heat load of 15 W, but the influence of NCG is less at adverse elevation. On the other hand, at favorable elevation, the temperature rise exhibits different characteristics in different LHP operation modes, i.e., positively correlated with heat load in gravity driven mode and negatively in capillaritygravity co-driven mode, and the transition heat load is 60 W. For an LHP that has already contained a certain amount of NCG, functioning at favorable elevation could eliminate the adverse effects of NCG on operating temperature and heat transfer performance to some extent. Furthermore, it is found that the presence of NCG and adverse elevation appears to inhibit the backflow during startup and improve startup stability. These results might have reference significance for the design and installation of the LHP for terrestrial applications.

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Development of Selection Methods for the Primary and Secondary Capillary Structures of Loop Heat Pipes

Kiseev

Sazhin

2022

J Eng Phys Thermophy

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Effect of evaporator tilt on the operating temperature of a loop heat pipe without a secondary wick

Cited by 21 publications

References 34 publications

Effect of evaporator tilt on a loop heat pipe with non-condensable gas

Effect of evaporator tilt on a loop heat pipe with non-condensable gas

Effect of evaporator/condenser elevations on a loop heat pipe with non-condensable gas

Development of Selection Methods for the Primary and Secondary Capillary Structures of Loop Heat Pipes

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