Experimental investigation of enhancing influence of Al2O3 nanoparticles on the convective heat transfer in a tube equipped with twisted tape inserts

Mozaffari, Javad; Mirjalily, Seyed Ali Agha; Ahrar, Amir Javad

doi:10.2298/tsci181010414m

Cited by 3 publications

(2 citation statements)

References 22 publications

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“…As previous researchers reported, an increase in the volume fraction of nanoparticles leads to an increase in the heat transfer coefficient [7,8,[14][15][16]. Here, the heat transfer coefficient does not increase for the volume fractions less than 3%.…”

Section: Local Heat Transfer Coefficientsupporting

confidence: 60%

“…For reliable design and optimization of process equipment, it is essential to know the information about the heat transfer rate for such liquids flowing through channels. Some researchers verified convective heat transfer of nanofluids in channels experimentally and numerically [10][11][12][13][14][15][16][17][18][19]. They presented correlations to predict hydrodynamic and heat transfer trends of nanofluids.…”

Section: Introductionmentioning

confidence: 99%

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Study of Laminar Convection Heat Transfer of Non-Newtonian Nanofluids in a Tube under Constant Heat Flux Using New Power-Law Relation

Bayareh¹,

Afshar²

2020

IJHT

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In this study, thermal and rheological behavior of non-Newtonian nanofluids in a tube is studied using a new power-law relation. The tube is under a constant heat flux and the viscosity of power-law non-Newtonian nanofluids is assumed to be a function of shear rate and temperature simultaneously. Fully developed velocity and uniform velocity profiles are considered as inlet boundary condition. It is demonstrated that the viscosity along the tube is affected by temperature and shear rate for fully developed and uniform flow profiles. Local heat transfer coefficient along the tube increases with the volume fraction, however volume fraction less than 3% does not affect local heat transfer. It is demonstrated that local heat transfer and average Nusselt number are decreasing functions of Reynolds number. Contrary to the previous studies, average Nusselt number is a decreasing function of the volume fraction of nanoparticles. The Nusselt number is suggested to be a function of Peclet number when the temperature effects are considered in the power-law relation.

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Section: Local Heat Transfer Coefficientsupporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Study of Laminar Convection Heat Transfer of Non-Newtonian Nanofluids in a Tube under Constant Heat Flux Using New Power-Law Relation

Bayareh¹,

Afshar²

2020

IJHT

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Effect of rectangular, triangular, and semi-circular hybrid nano phase change material chambers under permanent magnetic field on the stepped solar still efficiency: An experimental study

Toosi,

Goshayeshi,

Zahmatkesh

et al. 2024

Case Studies in Thermal Engineering

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Heat Transfer Enhancement in Laminar Pipe Flow Using Al2O3–Water Nanofluid and Twisted Tape Inserts

Bairagi

Roy²,

Mandal

2023

Journal of Thermal Science and Engineering Applications

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In this study, an attempt has been made to carry out a numerical investigation using water based Al2O3 nanofluid, flowing through a circular tube under constant inlet temperature and constant heat flux condition in a laminar flow regime. The water-based Al2O3 nanofluid is used in a circular plane tube first and then this process is repeated for the same tube with a twisted tape inserted having twist ratio (H/w) of 1.85 at Reynolds number ranging from 680 to 2030. For the numerical analysis, ANSYS FLUENT is used to solve 3-dimensional conservation equations of mass, momentum and energy. The simulated results indicate that when twisted tape is used, heat transfer rates increase significantly with the use of nanofluid. In case of nanofluid with the plane tube, only 10-24% enhancement in heat transfer rate is noted. On the other hand, almost 27-45% increase in heat transfer is observed compared to that with only water when twisted tape is inserted into it. It is also noticed that the friction factor value increases with the increase in volume fraction. But the effect of heat transfer is more significant than the other factors. The best thermo-hydraulic performance factor achieved is 2.1 using nanofluids with 5% volume fraction at high Reynolds number when twisted tape is also inserted.

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Experimental investigation of enhancing influence of Al2O3 nanoparticles on the convective heat transfer in a tube equipped with twisted tape inserts

Cited by 3 publications

References 22 publications

Study of Laminar Convection Heat Transfer of Non-Newtonian Nanofluids in a Tube under Constant Heat Flux Using New Power-Law Relation

Study of Laminar Convection Heat Transfer of Non-Newtonian Nanofluids in a Tube under Constant Heat Flux Using New Power-Law Relation

Effect of rectangular, triangular, and semi-circular hybrid nano phase change material chambers under permanent magnetic field on the stepped solar still efficiency: An experimental study

Heat Transfer Enhancement in Laminar Pipe Flow Using Al2O3–Water Nanofluid and Twisted Tape Inserts

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