Effect of alumina nanoparticles in the fluid on heat transfer in double-pipe heat exchanger system

Chun, Byung Hee; Kang, Hyun Uk; Kim, Sung Hyun

doi:10.1007/s11814-008-0156-5

Cited by 114 publications

(42 citation statements)

References 16 publications

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“…Al 2 O 3 -water nanofluids are selected as working substances in this study [29,30], which are assumed as the mixtures of base fluid (water) and Al 2 O 3 nanoparticle with 30 nm diameter. The physical properties of the base fluid and Al 2 O 3 nanoparticle [31,32] are shown in Table 1, in which the reference temperature is 293 K. A single-phase model [33] is used to evaluate the physical properties of Al 2 O 3 -water nanofluids, and based on the assumptions that the aluminium oxide nanoparticle is spherical and homogeneously suspended in the base fluid, the following models are used to compute density, specific heat, dynamic viscosity, and thermal conductivity, respectively. Obtained from the above data and models, the physical properties of Al 2 O 3 -water nanofluids are shown in Table 2.…”

Section: Physical Properties Of Nanofluidsmentioning

confidence: 99%

Heat Transfer Enhancement and Entropy Generation of Nanofluids Laminar Convection in Microchannels with Flow Control Devices

Xie

Zhang

et al. 2016

Entropy

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Abstract:The heat transfer enhancement and entropy generation of Al 2 O 3 -water nanofluids laminar convective flow in the microchannels with flow control devices (cylinder, rectangle, protrusion, and v-groove) were investigated in this research. The effects of the geometrical structure of the microchannel, nanofluids concentration ϕ(0%-3%), and Reynolds number Re (50-300) were comparatively studied by means of performance parameters, as well as the limiting streamlines and temperature contours on the modified heated surfaces. The results reveal that the relative Fanning frictional factor f/f 0 of the microchannel with rectangle and protrusion devices are much larger and smaller than others, respectively. As the nanofluids concentration increases, f/f 0 increases accordingly. For the microchannel with rectangle ribs, there is a transition Re for obtaining the largest heat transfer. The relative Nusselt number Nu/Nu 0 of the cases with larger nanofluids concentration are greater. The microchannels with cylinder and v-groove profiles have better heat transfer performance, especially at larger Re cases, while, the microchannel with the protrusion devices is better from an entropy generation minimization perspective. Furthermore, the variation of the relative entropy generation S 1 /S 1 0 are influenced by not only the change of Nu/Nu 0 and f/f 0 , but also the physical parameters of working substances.

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Section: Physical Properties Of Nanofluidsmentioning

confidence: 99%

Heat Transfer Enhancement and Entropy Generation of Nanofluids Laminar Convection in Microchannels with Flow Control Devices

Xie

Zhang

et al. 2016

Entropy

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“…Chun et al (2008) studied the effect of alumina nanoparticles dispersed in transformer oil in a double pipe heat exchanger, up to 1% volume concentration, experimentally with laminar flow regime. Their results show that nanofluids give a better thermal performance compared with base fluid.…”

Section: Double Pipe Heat Exchangersmentioning

confidence: 99%

A Comprehensive Review on the Nanofluids Application in the Tubular Heat Exchangers

Molana¹

2016

AJHMT

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This paper focuses on the nanofluids implementation in the tubular heat exchangers namely, shell and tube, double pipe and coiled tube. The author thinks that a comprehensive review of performed studies in this area can demonstrate advantages and disadvantages of nanofluids application in the heat exchangers. All available papers are reflected in this paper including experimental and numerical studies with all of their important features and findings. The most considered paper confirmed the Nusselt number enhancement with the use of nanofluids in the heat exchangers. Also, nanofluids implementation in the heat exchangers resulted in an increase in the required pumping power, in the most cases.

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“…Probably, Duangthongsuk and Wongwises [3] were the first who suggested the addition of solid particles in nanometric size into a base fluid and reported enhancement of thermal conductivity compared to base fluid. Many studies have been done in order to evaluate the heat transfer performance and flow characteristics of various nanofluids in both the laminar and the turbulent flow regimes [4][5][6][7][8][9][10][11][12][13][14]. Results of these studies proved that the inclusion of nanoparticles improves the thermal conductivity compared to the conventional fluid and increases heat transfer rate with the nanoparticle concentration.…”

Section: Introductionmentioning

confidence: 99%

Effect of Twisted-Tape Turbulators and Nanofluid on Heat Transfer in a Double Pipe Heat Exchanger

Maddah

Aghayari

Farokhi

et al. 2014

Journal of Engineering

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Heat transfer and overall heat transfer in a double pipe heat exchanger fitted with twisted-tape elements and titanium dioxide nanofluid were studied experimentally. The inner and outer diameters of the inner tube were 8 and 16 mm, respectively, and cold and hot water were used as working fluids in shell side and tube side. The twisted tapes were made from aluminum sheet with tape thickness (d) of 1 mm, width (W) of 5 mm, and length of 120 cm. Titanium dioxide nanoparticles with a diameter of 30 nm and a volume concentration of 0.01% (v/v) were prepared. The effects of temperature, mass flow rate, and concentration of nanoparticles on the overall heat transfer coefficient, heat transfer changes in the turbulent flow regime (Re ≥ 2300), and counter current flow were investigated. When using twisted tape and nanofluid, heat transfer coefficient was about 10 to 25 percent higher than when they were not used. It was also observed that the heat transfer coefficient increases with operating temperature and mass flow rate. The experimental results also showed that 0.01% TiO 2 /water nanofluid with twisted tape has slightly higher friction factor and pressure drop when compared to 0.01% TiO 2 /water nanofluid without twisted tape. The empirical correlations proposed for friction factor are in good agreement with the experimental data.

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Effect of alumina nanoparticles in the fluid on heat transfer in double-pipe heat exchanger system

Cited by 114 publications

References 16 publications

Heat Transfer Enhancement and Entropy Generation of Nanofluids Laminar Convection in Microchannels with Flow Control Devices

Heat Transfer Enhancement and Entropy Generation of Nanofluids Laminar Convection in Microchannels with Flow Control Devices

A Comprehensive Review on the Nanofluids Application in the Tubular Heat Exchangers

Effect of Twisted-Tape Turbulators and Nanofluid on Heat Transfer in a Double Pipe Heat Exchanger

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