Journal ArticleDOI
Thermal and electrical conductivities of water-based nanofluids prepared with long multiwalled carbon nanotubes
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In this paper, the authors measured the thermal and electrical conductivities of suspensions of multiwalled carbon nanotubes (MWCNT) in water by using a coaxialcylinder cell that allows the sample temperature to be varied from 15 to 75°C.Abstract:
Thermal and electrical conductivities of suspensions of multiwalled carbon nanotubes (MWCNT) in water were measured as a function of temperature, nanotube weight content, and nanotube length. Nanotubes were dispersed in water by using gum Arabic as surfactant. The thermal conductivity was measured by the steady-state method by using a coaxial-cylinder cell that allows the sample temperature to be varied from 15to75°C. Our measurements show that the thermal conductivity enhancement as compared to water linearly increases when the MWCNT weight content increases from 0.01to3wt%, reaching 64% for the MWCNT weight content of 3wt%. The thermal conductivity enhancement is found to be temperature independent up to MWCNT weight content of 2wt%. The average length of the nanotubes appears to be a very sensitive parameter. The thermal conductivity enhancement as compared to water increases by a factor of 3 when the nanotube average length increases in the 0.5–5μm range. Electrical conductivity measurements show that the electrical properties do not follow the same trend as a function of MWCNT weight content, as compared to thermal properties. The electrical conductivity is mainly constant in the studied range, but undergoes a drop when the weight content decreases to about 0.1wt%, which suggests that the MWCNT network in the base fluid might be percolating at this very low value. By comparison, the thermal conductivity does not show any percolation threshold.read more
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Journal ArticleDOI
A benchmark study on the thermal conductivity of nanofluids
Jacopo Buongiorno,David C. Venerus,Naveen Prabhat,Thomas J. McKrell,Jessica Townsend,Rebecca Christianson,Yuriy V. Tolmachev,Pawel Keblinski,Lin-Wen Hu,Jorge L. Alvarado,In Cheol Bang,In Cheol Bang,Sandra Whaley Bishnoi,Marco Bonetti,Frank Botz,Anselmo Cecere,Yun Chang,Gang Chen,Haisheng Chen,Sung Jae Chung,Minking K. Chyu,Sarit K. Das,Roberto Di Paola,Yulong Ding,Frank Dubois,Grzegorz Dzido,Jacob Eapen,Werner Escher,Werner Escher,Denis Funfschilling,Quentin Galand,Jinwei Gao,Patricia E. Gharagozloo,Kenneth E. Goodson,Jorge Gustavo Gutierrez,Haiping Hong,Mark Horton,Kyo Sik Hwang,Carlo Saverio Iorio,Seok Pil Jang,Andrzej B. Jarzębski,Yiran Jiang,Liwen Jin,Stephan Kabelac,Aravind Kamath,Mark A. Kedzierski,Lim Geok Kieng,Chongyoup Kim,Ji Hyun Kim,Seokwon Kim,Seung-Hyun Lee,Kai Choong Leong,Indranil Manna,Bruno Michel,Rui Ni,Hrishikesh E. Patel,John Philip,Dimos Poulikakos,Cécile Reynaud,Raffaele Savino,Pawan Singh,Pengxiang Song,Thirumalachari Sundararajan,Elena V. Timofeeva,Todd Tritcak,Aleksandr N. Turanov,Stefan Van Vaerenbergh,Dongsheng Wen,Sanjeeva Witharana,Chun Yang,Wei Hsun Yeh,Xiao Zheng Zhao,Sheng-Qi Zhou +72 more
TL;DR: The International Nanofluid Property Benchmark Exercise (INPBE) as mentioned in this paper was held in 1998, where the thermal conductivity of identical samples of colloidally stable dispersions of nanoparticles or "nanofluids" was measured by over 30 organizations worldwide, using a variety of experimental approaches, including the transient hot wire method, steady state methods, and optical methods.
Journal Article
A Benchmark Study on the Thermal Conductivity of Nanofluids
Jacopo Buongiomo,David C. Venerus,Naveen Prabhat,Thomas J. McKrell,Jessica Townsend,Rebecca Christianson,Yuriv Tolmachev,Pawel Keblinski,Lin-Wen Hu,Jorge L. Alvarado,In Cheol Bang,Sandra Whaley Bishnoi,Marco Bonetti,Anselmo Cecere,Yun Chang,Gang Chen,Haisheng Chen,Sung Jae Chung,Minking K. Chyu,Sarit K. Das,Roberto Di Paola,Yulong Ding,Frank Dubois,Grzegorz Dzido,Jacob Eapen,Denis Funfschilling,Quentin Galand,Jinwei Gao,Patricia E. Gharagozloo,Kenneth E. Goodson,Jorge Gustavo Gutierrez,Haiping Hong,Mark Horton,Kyo Sik Hwang,Carlo Saverio Iorio,Seok Pil Jang,Andrzej B. Jarzębski,Yiran Jiang,Stephan Kabelac,Liwen Jin,Aravind Kamath,Chongyoup Kim,Ji Hyun Kim,Seokwon Kim,Seunghyun Lee,Kai Choong Leong,Indranil Manna,Rui Ni,Hrishikesh E. Patel,Cecil Reynaud,Raffaele Savino,Pawan Singh,Pengxiang Song,Thirumalachari Sundararajan,Alekzandr N Turanov,Stefan Van Vaerenbergh,Dongsheng Wen,Sanjeeva Witharana,Chun Yang,Wei-Hsun Yeh,Xiao-Zheng Zhao,Sheng-Qi Zhou +61 more
TL;DR: The International Nanofluid Property Benchmark Exercise (INPBE) as discussed by the authors was held in 1998, where the thermal conductivity of identical samples of colloidally stable dispersions of nanoparticles or "nanofluids" was measured by over 30 organizations worldwide, using a variety of experimental approaches, including the transient hot wire method, steady state methods, and optical methods.
Journal ArticleDOI
Review on thermal properties of nanofluids: Recent developments.
S. A. Angayarkanni,John Philip +1 more
TL;DR: The preparation of nanofluids by various techniques, methods of stabilization, stability measurement techniques, thermal conductivity and heat capacity studies, proposed mechanisms of heat transport, theoretical models on thermal Conductivity, factors influencing k and the effect of nanoinclusions in PCM are discussed in this review.
Journal ArticleDOI
Experimental study on thermal conductivity of ethylene glycol containing hybrid nano-additives and development of a new correlation
TL;DR: In this article, an experimental investigation on the effects of hybrid nano-additives, composed of magnesium oxide (MgO) and functionalized multi-walled carbon nanotubes (FMWCNTs), on the thermal conductivity of ethylene glycol (EG) is presented.
Journal ArticleDOI
Preparation and evaluation of stable nanofluids for heat transfer application: A review
TL;DR: In this paper, the authors reviewed the work carried out by various researchers in the last two decades and summarized the preparation and analytical techniques used for preparation of stable nanofluids.
References
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Journal ArticleDOI
Convective Transport in Nanofluids
TL;DR: In this article, the authors considered seven slip mechanisms that can produce a relative velocity between the nanoparticles and the base fluid and concluded that only Brownian diffusion and thermophoresis are important slip mechanisms in nanofluids.
Journal ArticleDOI
Anomalously increased effective thermal conductivities of ethylene glycol-based nanofluids containing copper nanoparticles
TL;DR: In this paper, it was shown that a "nanofluid" consisting of copper nanometer-sized particles dispersed in ethylene glycol has a much higher effective thermal conductivity than either pure or pure glycol or even polyethylene glycol containing the same volume fraction of dispersed oxide nanoparticles.
Journal ArticleDOI
Measuring Thermal Conductivity of Fluids Containing Oxide Nanoparticles
TL;DR: In this paper, a transient hot-wire method was used to measure the thermal conductivity of a small amount of nanoparticles and the experimental results showed that these nanoparticles have substantially higher thermal conductivities than the same liquids without nanoparticles.
Journal ArticleDOI
Anomalous thermal conductivity enhancement in nanotube suspensions
TL;DR: In this paper, the authors have produced nanotube-in-oil suspensions and measured their effective thermal conductivity, which is anomalously greater than theoretical predictions and is nonlinear with nanotubes loadings.
Journal ArticleDOI
Thermal boundary resistance
E. T. Swartz,Robert O. Pohl +1 more
TL;DR: In this article, the thermal boundary resistance at interfaces between helium and solids (Kapitza resistance) and thermal boundary resistances at interfaces interfaces between two solids are discussed for temperatures above 0.1 K. The apparent qualitative differences in the behavior of the boundary resistance in these two types of interfaces can be understood within the context of two limiting models of boundary resistance, the acoustic mismatch model, which assumes no scattering, and the diffuse mismatch model that all phonons incident on the interface will scatter.