Influence of carbon nanotube suspension on the thermal performance of a miniature thermosyphon

Liu, Zhenhua; Yang, Xiaohu; Wang, Guo-san; Guo, G.Q.

doi:10.1016/j.ijheatmasstransfer.2009.12.065

Cited by 86 publications

(23 citation statements)

References 23 publications

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“…The volume concentration of the nanoparticles ranged from 1% to 3%. Liu et al [17] examined a miniature thermosyphon (of 6 mm internal diameter and 350 mm long), charged with water-CNT nanofluids of different carbon nanotube (CNT) concentrations (1.0-2.0wt%). The results show that water-CNT nanofluids augment the performance of the thermosyphon and maximum heat transfer enhancement was achieved for 2% CNT concentration.…”

Section: Introductionmentioning

confidence: 99%

Effect of nanofluid concentration on two-phase thermosyphon heat exchanger performance

Cieśliński

2016

Archives of Thermodynamics

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An approach -relaying on application of nanofluid as a working fluid, to improve performance of the two-phase thermosyphon heat exchanger (TPTHEx) has been proposed. The prototype heat exchanger consists of two horizontal cylindrical vessels connected by two risers and a downcomer. Tube bundles placed in the lower and upper cylinders work as an evaporator and a condenser, respectively. Distilled water and nanofluid water-Al2O3 solution were used as working fluids. Nanoparticles were tested at the concentration of 0.01% and 0.1% by weight. A modified Peclet equation and Wilson method were used to estimate the overall heat transfer coefficient of the tested TPTHEx. The obtained results indicate better performance of the TPTHEx with nanofluids as working fluid compared to distilled water, independent of nanoparticle concentration tested. However, increase in nanoparticle concentration results in overall heat transfer coefficient decrease of the TPTHEx examined. It has been observed that, independent of nanoparticle concentration tested, decrease in operating pressure results in evaporation heat transfer coefficient increase.

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Section: Introductionmentioning

confidence: 99%

Effect of nanofluid concentration on two-phase thermosyphon heat exchanger performance

Cieśliński

2016

Archives of Thermodynamics

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“…During recent years, nanofluids (NFs) have been suggested as working fluids to enhance heat pipes thermal performance. Various types of NFs with different concentrations, particle sizes and shapes have been used and interesting results on thermal performance enhancement are achieved [1][2][3][4][5][6][7][8][9]. Liu and Zhu [10] studied effects of aqueous CuO NFs on thermal performance of a horizontal mesh heat pipe experimentally.…”

Section: Introductionmentioning

confidence: 99%

Thermal performance of screen mesh heat pipe with Al2O3 nanofluid

Ghanbarpour

Nikkam

Khodabandeh

et al. 2015

Experimental Thermal and Fluid Science

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a b s t r a c tThis study presents the effect of Al 2 O 3 nanofluid (NF) on thermal performance of screen mesh heat pipe in cooling applications. Three cylindrical copper heat pipes of 200 mm length and 6.35 mm outer diameter containing two layers of screen mesh were fabricated and tested with distilled water and water based Al 2 O 3 NF with mass concentrations of 5% and 10% as working fluids. To study the effect of NF on the heat pipes thermal performance, the heat input is increased and then decreased consecutively and the heat pipes surface temperatures are measured at steady state conditions. Results show that using 5 wt.% of Al 2 O 3 NF improves the thermal performance of the heat pipe for increasing and decreasing heat fluxes compared with distilled water, while utilizing 10 wt.% of Al 2 O 3 NF deteriorates the heat pipe thermal performance. For heat pipe with 5 wt.% Al 2 O 3 NF the reduction in thermal resistance of the heat pipe is found to be between 6% and 24% for increasing and between 20% and 55% for decreasing heat fluxes, while the thermal resistance increased between 187% and 206% for increasing and between 155% and 175% for decreasing steps in heat pipe with 10 wt.% of Al 2 O 3 NF.

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“…The result shows that at the same charge volume, the thermal resistance of the heat pipe with nanofluids is reduced by 10% to 80% compared with that of DI water at an input power of 30 to 60 W. The results are compared with those of Wei et al (2005). They showed that the maximum reduction in the thermal resistance of the heat pipe is 50% for 10nm silver nanoparticles and 80% for 35nm silver nanoparticles An experimental study was carried out by Liu et al (2010) to understand the heat transfer performance of a miniature thermosyphon using water-based carbon nanotube (CNT) suspensions as the working fluid. Effects of the CNT mass concentration and the operation pressure on the average evaporation and condensation heat transfer coefficients, the critical heat flux and the total heat resistance of the thermosyphon were investigated and discussed.…”

Section: Introductionmentioning

confidence: 99%

Performance of Two Phase Gravity Assisted Thermosyphon Using Nanofluids

Shanthi¹,

Velraj²

2014

Frontiers in Heat Pipes

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The recent pioneering advancement in the use of nanofluids as the working fluid in the two phase gravity assisted thermosyphon (TPGAT) significantly improved the heat transfer performance. In the present study, the performance enhancement of TPGAT using carbonaceous and metal based nanofluid as the working fluid is investigated. The experiment are conducted at various heat input in the evaporator and at different fill ratios. The results of the experiments revealed that the nanoparticles play a major role in enhancing the performance by bombarding the formation of vapour bubbles in the evaporator section. It is also found that the fill ratio has varying role in the condenser and evaporator section at various heat input of the evaporator section.

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Influence of carbon nanotube suspension on the thermal performance of a miniature thermosyphon

Cited by 86 publications

References 23 publications

Effect of nanofluid concentration on two-phase thermosyphon heat exchanger performance

Effect of nanofluid concentration on two-phase thermosyphon heat exchanger performance

Thermal performance of screen mesh heat pipe with Al2O3 nanofluid

Performance of Two Phase Gravity Assisted Thermosyphon Using Nanofluids

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