Influence of nanofluid on turbulent forced convective flow in a channel with detached rib-arrays

Parsazadeh, Mohammad; Mohammed, Hussein A.; Fathinia, Farshid

doi:10.1016/j.icheatmasstransfer.2013.05.006

Cited by 39 publications

(7 citation statements)

References 30 publications

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“…[55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72]. In most cases, the quantum theory is necessary for describing the organization forms of matter.…”

Section: Discussionmentioning

confidence: 99%

Influence of Various Geometrical Shapes on Mixed Convection Through an Open-Cell Aluminium Foam Filled with Nanofluid

Mahdi¹,

Mohammed²,

Munisamy

et al. 2014

Jnl of Comp & Theo Nano

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Mixed convection heat transfer and fluid flow through an open-cell aluminium foam around various heat source shapes with constant heat flux inside rectangular horizontal channel, filled with nanofluid is numerically investigated. An open-cell aluminium foam is made of alloy 6101-T6 with porosity 93% and pore densities (10 40) PPI. Nanofluid with three different types of nanoparticles, aluminium oxide (Al 2 O 3 ), copper oxide (CuO) and silicon dioxide (SiO 2 ) with volume fraction of 4% and nanoparticle diameter of (25 nm) dispersed in water are used. Four models of cylindrical shapes are employed as test sections: (model 1) aluminium foam is around a rectangular cylinder = 90 , (model 2) the aluminium foam is around a trapezoidal cylinder shape ( = 82 875 , (model 3) aluminium foam is around a trapezoidal cylinder shape = 75 964 and (model 4) the aluminium foam is around the triangular cylinder shape = 63 435 .In all models, the heat flux is 300 W/m 2 and, aluminium foam length of (5 cm) is used with Reynolds number range of (200-600). The governing equations continuity, momentum and energy are solved by using the Finite-volume method (FVM). The effects of aluminium foam, nanofluid properties and Reynolds number on the Nusselt number and friction factor values, with four models in a rectangular horizontal channel are investigated. The results have shown that higher average Nusselt number is obtained with the use of nanofluid (water + SiO 2 and 40PPI aluminium foam pore density at higher Reynolds number with model (4). Low friction factor is obtained with the use of nanofluid (water + SiO 2 and 10PPI aluminium foam pore density at higher Reynolds number with model (4). Average Nusselt number increases and friction factor decreases when Reynolds number value increases with all models.

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“…[55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72]. In most cases, the quantum theory is necessary for describing the organization forms of matter.…”

Section: Discussionmentioning

confidence: 99%

Influence of Various Geometrical Shapes on Mixed Convection Through an Open-Cell Aluminium Foam Filled with Nanofluid

Mahdi¹,

Mohammed²,

Munisamy

et al. 2014

Jnl of Comp & Theo Nano

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“…The governing equations used to simulate this problem are presented in this section as follows (Parsazadeh et al , 2013): Conservation of mass equation: …”

Section: Mathematical Modelmentioning

confidence: 99%

Potential of gear-ring turbulator in three-dimensional heat exchanger tube from second law of thermodynamic viewpoint

Moghaddaszadeh

Rashidi

Esfahani

2018

HFF

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Purpose This paper aims to use the second law of thermodynamic to evaluate the potential of gear-ring turbulator in a three-dimensional heat exchanger tube. Accordingly, a numerical simulation is performed to obtain the irreversibilities in a three-dimensional heat exchanger tube equipped with some gear-ring turbulators for turbulence regime. Design/methodology/approach A numerical simulation is performed to obtain the irreversibilities in a three-dimensional heat exchanger tube equipped with some gear-ring turbulators for turbulence regime. The analysis is carried out based on shear stress transport (SST) k-ω turbulent model. The influences of different parameters containing tooth number, free-space length ratios and Reynolds number on frictional and thermal irreversibilities and Bejan number are discussed. Findings The results indicated that the thermal irreversibility reduces by decreasing the tooth number. For example, the thermal entropy generation decreases about 25.81 per cent by decreasing the tooth number in the range of 24 to 0 at Re = 6,000. Moreover, the frictional entropy generation decreases by increasing the tooth number as the gear with more tooth number causes a lower flow disturbance. Originality/value The present study arranged a numerical work to study the potential of a gear-ring turbulator in a heat exchanger tube from first and second laws of thermodynamic viewpoint. The turbulent flow is considered for this problem. The literature review showed that the usage of a gear-ring turbulator in a heat exchanger tube is not investigated from the second law of thermodynamic viewpoint by previous studies. As a result, the influences of different parameters containing tooth number, free-space length ratios and Reynolds number on frictional and thermal irreversibilities and Bejan number are discussed.

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“…Heyhat et al (2012) examined the effect of ‫ݑܰ‬ ௦ and ݂ ௦ of the nanofluids in a round tube with uniform wall temperature under turbulent stream conditions experimentally. Parsazadeh et al (2013) reported that the nanofluid flow is numerically examined to analyses the outcomes of numerous types of nanoparticles with numerous nanoparticle parameters in a fully detached obstacle roughened duct. The consequences indicate that the highest heat transfer enhancement is achieved with ܱܵ݅ ଶ nanofluid and the flow friction not significantly change with by means of dissimilar types of nanoparticles in the base fluid.…”

Section: Introductionmentioning

confidence: 99%

“…From this brief review [Navaei et al (2015); Vanaki and Mohammed (2015); Al-Shamani et al (2015); Parsazadeh et al (2013); Vanaki et al (2014); Ahmed et al (2013); Manca et al (2012); Mohammed et al (2012); Haridas et al (2015); Abed et al (2015)] it follows that currently in the field of turbulent heat transfer of nanofluids there are still many unresolved issues. In particular, most of the works do not discuss in principle the issue of thermal-hydraulic efficiency of TiO ଶ െ H ଶ O based nanofluid flow in V-pattern protruded rib square channel on heat transfer and flow friction.…”

Section: Introductionmentioning

confidence: 99%

DEVELOPMENT OF NEW CORRELATIONS FOR NUSSELT NUMBER AND FRICTION FACTOR OF TiO_2/WATER BASED NANOFLUID FLOW IN V-PATTERN PROTRUSION RIBBED SQUARE CHANNEL

Kumar¹,

Singh²,

Maithani³

et al. 2018

Frontiers in Heat and Mass Transfer

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Nanofluids play important roles in the heat transfer and flow characteristics in ribbed square channels. Systematic experiments are conducted to measure heat transfer enhancement and TiO ଶ െ H ଶ O based nanofluid flow characteristics on a protruded with combined V-type ribbed square channel. Reynolds number studied in the channel range from 4000-18000. Investigational parameters of square channel contain, volume fraction range of 1.0-4.0%, particle diameter range of 30nm-45nm, relative protruded rib height range of 0.10-0.25, ratio of protruded height to print diameter range of 0.8-2.0, relative protruded rib pitch ratio range of 2.0-3.5 and angle of attack of 30 0 -75 0 respectively. Results indicates that the thermal performance of the protruded combined V-type ribbed square channel falls with increasing Reynolds number. The highest value of thermal hydraulic performance parameter is found to be 3.21for the range of parameters investigated. Correlations predicting Nusselt number and friction factor as a function of volume fraction, particle diameter range, relative protruded rib height, ratio of protruded height to print diameter, relative protruded rib pitch ratio, angle of attack and flow parameter. The correlations for Nusselt number and friction factor have also been developed on the basis of experimental data with considerable good accuracy.

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Influence of nanofluid on turbulent forced convective flow in a channel with detached rib-arrays

Cited by 39 publications

References 30 publications

Influence of Various Geometrical Shapes on Mixed Convection Through an Open-Cell Aluminium Foam Filled with Nanofluid

Influence of Various Geometrical Shapes on Mixed Convection Through an Open-Cell Aluminium Foam Filled with Nanofluid

Potential of gear-ring turbulator in three-dimensional heat exchanger tube from second law of thermodynamic viewpoint

DEVELOPMENT OF NEW CORRELATIONS FOR NUSSELT NUMBER AND FRICTION FACTOR OF TiO_2/WATER BASED NANOFLUID FLOW IN V-PATTERN PROTRUSION RIBBED SQUARE CHANNEL

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