An investigation of the thermal performance of cylindrical heat pipes using nanofluids

Shafahi, Maryam; Bianco, Vincenzo; Vafai, Kambiz; Manca, Oronzio

doi:10.1016/j.ijheatmasstransfer.2009.09.019

Cited by 223 publications

(63 citation statements)

References 19 publications

(40 reference statements)

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“…The research on application of nanofluids in heat pipes was firstly published in 2003 [6]. Many articles have been published since then, involving micro-grooved heat pipe, mesh wick heat pipe, sintered metal wick heat pipe, oscillating heat pipe (OHP), and loop heat pipe (LHP) [7][8][9][10][11][12]. The applied nano-materials included metal, metal oxides, diamond, carbon nanotubes and several other materials.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer in a Loop Heat Pipe Using Fe₂NiO₄-H₂O Nanofluid

2017

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Abstract. Nanofluids are stable suspensions of nano fibers and particles in fluids. Recent investigations show that thermal behavior of these fluids, such as improved thermal conductivity and convection coefficients are superior to those of pure fluid or fluid suspension containing larger size particles. The use of enhanced thermal properties of nanofluids in a loop heat pipe (LHP) for the cooling of computer microchips is the main aim of this study. Thus, the Fe2NiO4-H2O served as the working fluid with nanoparticle mass concentrations ranged from 0 to 3 % in LHP for the heat input range from 20W to 60W was employed. Experimental apparatus and procedures were designed and implemented for measurements of the surface temperature of LHP. Then, a commercial liquid cooling kit of LHP system similar as used in experimental study was installed in real desktop PC CPU cooling system. The test results of the proposed system indicate that the average decrease of 5.75 o C (14%) was achieved in core temperatures of desktop PC CPU charged with Fe2NiO4-H2O as compared with pure water under the same operating conditions. The results from this study should find it's used in many industrial processes in which the knowledge on the heat transfer behavior in nanofluids charged LHP is of uttermost importance.

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Section: Introductionmentioning

confidence: 99%

Heat Transfer in a Loop Heat Pipe Using Fe₂NiO₄-H₂O Nanofluid

2017

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“…Do et al (2010) conducted experiment on the screen mesh wicked heat pipes using Al 2 O 3 nanofluids and showed that the heat pipe performance has been increased up to 40%. A two -dimensional analysis by Shafahi et al(2010) is presented to study the thermal performance of a cylindrical heat pipe utilizing nanofluids and they found that the nanoparticles within the liquid enhance the thermal performance of the heat pipe by reducing the thermal resistance. Yang et al (2008) showed that CuO nanofluid can improve the thermal performance of the heat pipe and also presented that an optimal mass concentration of 1.0 wt% is enough…”

Section: Introductionmentioning

confidence: 99%

Effect of filling ratio on thermal characteristics of circular heat pipe using nanofluid

Manimaran¹,

Palaniradja²,

Alagumurthi³

2012

Frontiers in Heat Pipes

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An experimental study was carried out to investigate the thermal characteristics of heat pipe using nanofluid and Deionized water (DI water) is presented in this work. The CuO/water nanofluid is used as one of the working fluid in experimental heat pipe with concentration of 1.0% wt .The test section of the heat pipe is made of copper tube with outer diameter 22 mm, inner diameter 20.8 mm and length 600 mm. The heat pipe is tested with (DI water) and nanofluid respectively. This study focused on the effects of heat input, fill ratio and angle of inclination on the thermal efficiency and thermal resistance of heat pipe. The experimental results indicate that the thermal efficiency increases when nanoparticles are added with the DI water (nanofluid) and also the heat pipe which uses nanofluid as working fluid shows lower thermal resistance value when compared to the heat pipe which uses DI water alone.

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“…Perfis de temperaturas na parede de um tubo de calor contendo nanofluidos compostos por água e CuO para diferentes concentrações de nanopartículas (Shafahi et al, 2010) 68…”

Section: Figura 22unclassified

“…(Shafahi et al, 2010) Zerbini (1984) 103 Tabela 11. Condições de contorno térmicas adotadas para os processos de evaporação e condensação para o trabalho de Zerbini (1984) 103 Tabela 12.…”

Section: Figura 24unclassified

“…O equacionamento que define a massa específica de uma destas misturas é a regra das misturas, apresentada em diversos estudos contendo dispersões sólido-líquido, como Pak e Cho (1998), para um líquido qualquer contendo partículas sólidas em dispersão ao longo deste líquido. O mesmo equacionamento possui referências nos trabalhos de Shafahi et al (2010), Gavtash et al (2012) e Rashidi e Nezamabad (2011), e pode ser escrito da seguinte forma:…”

Section: Propriedades De Nanofluidos Contendo Nanotubos De Carbonounclassified

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Análise da modelagem utilizada para a simulação computacional do desempenho de um tubo de calor utilizando nanofluidos em seu interior.

Pinto¹

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Application of nanofluids in heat pipes usually presents satisfactory experimental results in studies seeking to reduce the thermal resistance of the heat pipe. However, the existing computational studies connecting heat pipes and nanofluids present conflicting results and lack a deeper discussion regarding the validity of the models currently used for the computational representation of the behavior of a nanofluid in a heat pipe, especially using unusual materials and fluids, like carbon nanotubes or ethylene glycol.Thus, the present study seek to analyze the accuracy and the precision obtained in a set of computational simulations using pre-established equations for the modeling of a nanofluid in a heat pipe by using a direct comparison with existing experimental data.This modeling uses the finite volume method and permits to determine the effect of the variation of the properties models and the volume fraction of a nanofluid in the resulting temperature fields and the thermal resistances of the simulations. The obtained resultsshow agreement with the expected behavior qualitatively, but fail to represent the phenomenon quantitatively, presenting maximum variations between 1,5% and 23,9% comparing to the experimentally measured average temperatures. This is justified by the hypothesis that the ebullition phenomenon modeling is more complex than the modeling currently used for computational simulations. This hypothesis is supported by the literature and creates possibilities for future researches.Keywords: Heat Pipes. Nanofluids. Carbon Nanotubes. Etyhlene Glycol. Computational Analysis. α Razão entre as condutividades térmica da nanopartícula e do fluidobase β1 LISTA DE FIGURASRazão entre a espessura da nanocamada formada ao redor da nanopartícula e o raio da nanopartícula β11Parâmetro utilizado no modelo de Nan As equações que governam a conservação da massa, da quantidade de movimento e da energia na região de vapor no interior do tubo de calor, respectivamente, são as seguintes:20 Na região da matriz porosa do tubo de calor, as equações de conservação da quantidade de movimento e da energia para o fluido no estado líquido se baseiam na lei de Darcy:[5]Onde kef representa a condutividade térmica efetiva da matriz porosa preenchida com líquido. Neste artigo, esta condutividade é obtida através da seguinte relação entre a condutividade do líquido kl, a condutividade da matriz porosa kmp e a porosidade da matriz porosa ε, extraída de Faghri, 1995:Por fim, nas paredes de um tubo de calor, a equação da condução de calor em coordenadas cilíndricas assume a seguinte forma:As condições de contorno adotadas para a solução do problema foram as seguintes:─ na região da interface líquido-vapor, a mudança de fase do fluido tem por consequência a formação de quantidade de movimento, responsável pela sucção de fluido de uma das regiões que compõem a interface e pela expulsão deste fluido para a outra região que compõe a interface. Para a representação deste fenômeno, é necessária a introdução de velocidades de sucç...

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An investigation of the thermal performance of cylindrical heat pipes using nanofluids

Cited by 223 publications

References 19 publications

Heat Transfer in a Loop Heat Pipe Using Fe₂NiO₄-H₂O Nanofluid

Heat Transfer in a Loop Heat Pipe Using Fe₂NiO₄-H₂O Nanofluid

Effect of filling ratio on thermal characteristics of circular heat pipe using nanofluid

Análise da modelagem utilizada para a simulação computacional do desempenho de um tubo de calor utilizando nanofluidos em seu interior.

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An investigation of the thermal performance of cylindrical heat pipes using nanofluids

Cited by 223 publications

References 19 publications

Heat Transfer in a Loop Heat Pipe Using Fe2NiO4-H2O Nanofluid

Heat Transfer in a Loop Heat Pipe Using Fe2NiO4-H2O Nanofluid

Effect of filling ratio on thermal characteristics of circular heat pipe using nanofluid

Análise da modelagem utilizada para a simulação computacional do desempenho de um tubo de calor utilizando nanofluidos em seu interior.

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Heat Transfer in a Loop Heat Pipe Using Fe₂NiO₄-H₂O Nanofluid

Heat Transfer in a Loop Heat Pipe Using Fe₂NiO₄-H₂O Nanofluid