Heat Transfer Augmentation of Aqueous Suspensions of Nanodiamonds in Turbulent Pipe Flow

Torii, Shuichi; Yang, Wen‐Jei

doi:10.1115/1.3072923

Cited by 43 publications

(19 citation statements)

References 13 publications

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“…The authors of work [12] investigated the coefficients of viscosity and thermal conductivity of nanodiamond-water nanofluids. Particle size ranged from 2 to 10 nm were used.…”

Section: Introductionmentioning

confidence: 99%

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Study of transport coefficients of nanodiamond nanofluids

Pryazhnikov

Минаков

Guzei

2017

J. Phys.: Conf. Ser.

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Abstract. Experimental data on the thermal conductivity coefficient and viscosity coefficient of nanodiamond nanofluids are presented. Distilled water and ethylene glycol were used as the base fluid. Dependences of transport coefficients on concentration are obtained. It was shown that the thermal conductivity coefficient increases with increasing nanodiamonds concentration. It was shown that base fluids properties and nanodiamonds concentration affect on the rheology of nanofluids. IntroductionNanoparticle colloidal suspensions, referred to as 'nanofluids' [1], have potential application in many heat transfer areas because of their intriguing properties such as a considerable increase in thermal conductivity, long-term stability and prevention of clogging in micro-channels [2][3]. Recently extensive efforts have been made to prepare thermal performance enhanced nanofluids [4][5]. Diamond is one of the materials with very high thermal conductivity, and diamond particles are often used as filler in mixtures for upgrading the performance of a matrix [6].In some studies nanodiamonds are used as particles that improve the thermal conductivity of heat-transfer liquids, such as water, oil and ethylene glycol just as particles of metals (gold, copper), metal oxides (aluminum and copper oxides) and silicon carbide [7][8][9][10][11]. It is reasonable to expect that the addition of diamond nanoparticles would lead to thermal performance enhancement in a base fluid. However, available information about them in the open literature is very scant. Torii et al. [12] conducted experiments in nanodiamond-water nanofluids. The authors of work [12] investigated the coefficients of viscosity and thermal conductivity of nanodiamond-water nanofluids. Particle size ranged from 2 to 10 nm were used. Viscosity coefficient of nanofluid with a particle volume concentration of 2% is 55% higher the viscosity coefficient of water. Thermal conductivity coefficient of nanofluid with a particle volume concentration of 5% is 15% higher the thermal conductivity of water.In work [13], nanodiamonds were chosen to form nanofluids with mixture base fluid composed of distilled water with a volume fraction of 0.55 and ethylene glycol with a volume fraction of 0.45. The thermal transport properties, including the thermal conductivity, the viscosity and the convective heat transfer coefficient, were investigated. The thermal conductivity enhancement of nanodiamond nanofluids increases with nanodiamonds loading and the thermal conductivity enhancement is more than 18.0% for a nanofluid at a nanodiamonds volume fraction of 0.02. Viscosity measurements show that the nanodiamond nanofluids demonstrate Newtonian behaviour, and the viscosity significantly decreases with temperature.

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“…The authors of work [12] investigated the coefficients of viscosity and thermal conductivity of nanodiamond-water nanofluids. Particle size ranged from 2 to 10 nm were used.…”

Section: Introductionmentioning

confidence: 99%

“…However, available information about them in the open literature is very scant. Torii et al [12] conducted experiments in nanodiamond-water nanofluids. The authors of work [12] investigated the coefficients of viscosity and thermal conductivity of nanodiamond-water nanofluids.…”

mentioning

confidence: 99%

Study of transport coefficients of nanodiamond nanofluids

Pryazhnikov

Минаков

Guzei

2017

J. Phys.: Conf. Ser.

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“…Gherasim et al [17], Nguyen et al [10], and Farajollahi et al [18] used a radial flow cooling system, a closed system designed for cooling of microprocessor or other electronic components and a shell and tube heat exchanger respectively. Both laminar [7][8][9][14][15][16][19][20][21][22][23]25] and turbulent [6,[9][10][11][12]18,24,[26][27][28] flow regimes were considered. Results of these investigations show that the heat transfer coefficient of nanofluids is considerably higher than that of the base fluid and the enhancement of heat transfer coefficient increases by nanoparticle concentration and nanofluid flow rate.…”

Section: Introductionmentioning

confidence: 99%

“…Oxide nanoparticles [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21], carbon nanotubes [22,23] and some other types on nanoparticles [24][25][26][27] were used in preparation of nanofluids. Conventional heat transfer fluids such as water, ethylene glycol and transformer oil were employed as the base fluid.…”

Section: Introductionmentioning

confidence: 99%

Laminar heat transfer of non-Newtonian nanofluids in a circular tube

Hojjat

Etemad

Bagheri

2010

Korean J. Chem. Eng.

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Forced convection heat transfer behavior of three different types of nanofluids flowing through a uniformly heated horizontal tube under laminar regime has been investigated experimentally. Nanofluids were made by dispersion of γ-Al 2 O 3 , CuO, and TiO 2 nanoparticles in an aqueous solution of carboxymethyl cellulose (CMC). All nanofluids as well as the base fluid exhibit shear-thinning behavior. Results of heat transfer experiments indicate that both average and the local heat transfer coefficients of nanofluids are larger than that of the base fluid. The enhancement of heat transfer coefficient increases by increasing nanoparticle loading. At a given Peclet number and nanoparticle concentration the local heat transfer coefficient decreases by axial distance from the test section inlet. It seems that the thermal entry length of nanofluids is greater than the base fluid and becomes longer as nanoparticle concentration increases.

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“…Timofeeva et al [72] compared experimental heat transfer coefficient enhancements reported in literature [94][95][96][97][98][99][100] to a prediction using the Dittus-Boelter correlation based on the measured nanofluid properties (i.e., without additional dynamic mechanisms), as shown in Figure 12. It was found that most of the data is well-predicted by the correlation alone and noted that larger particle suspensions generally perform the best.…”

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confidence: 99%

Heat Transfer Fluids

Lenert

Nam

Wang

2012

Annual Rev Heat Transfer

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The choice of heat transfer fluids has significant effects on the performance, cost and reliability of solar thermal systems. In this chapter, we evaluate existing heat transfer fluids such as oils and molten salts based on a new figure of merit capturing the combined effects of thermal storage capacity, convective heat transfer characteristics and hydraulic performance of the fluids.Thermal stability, freezing point and safety issues are also discussed. Through a comparative analysis, we examine alternative options for solar thermal heat transfer fluids including watersteam mixtures (direct steam), ionic liquids/melts and suspensions of nanoparticles (nanofluids), focusing on the benefits and technical challenges. DOI: 10.1615/AnnualRevHeatTransfer.2012004122 SOURCE: Lenert, Andrej, Youngsuk Nam, and Evelyn N. Wang. "Heat Transfer Fluids." Annual Review of Heat Transfer 15, 2012. 2 DOI: 10.1615/AnnualRevHeatTransfer.2012004122 SOURCE: Lenert, Andrej, Youngsuk Nam, and Evelyn N. Wang. "Heat Transfer Fluids." Annual Review of Heat Transfer 15, 2012. 3 V averaged bulk velocity (ms -1 )

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Heat Transfer Augmentation of Aqueous Suspensions of Nanodiamonds in Turbulent Pipe Flow

Cited by 43 publications

References 13 publications

Study of transport coefficients of nanodiamond nanofluids

Study of transport coefficients of nanodiamond nanofluids

Laminar heat transfer of non-Newtonian nanofluids in a circular tube

Heat Transfer Fluids

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