Numerical investigation on turbulent convective heat transfer of nanofluid flow in a square cross-sectioned duct

Abstract

Purpose The purpose of this study is to numerically investigate the heat transfer enhancement by using two different nanofluids flow throughout the square duct under a constant heat flux (500 × 103 W/m2). Design/methodology/approach In numerical computations, ANSYS Fluent code based on the finite volume method was used to solve governing equations by iteratively. Water, Al2O3-water and TiO2-water nanofluids were used for different flow velocities changing 1 m/s to 8 m/s (i.e. Reynolds number varying from 3,000 to 100,000). Findings The results were compared with results published previously in the literature and close agreement was observed especially considering Dittus and Boelter correlation for water. It was found that from the obtained results, increasing flow velocity and volume fractions of nanoparticles has caused to increase Nu number for all cases. Besides, variations of pressure drop, Darcy friction factor are presented graphically and discussed in detail. The results are consistent with a deviation of 1.3 to 15 per cent with the results of other researchers. Originality/value The effects of the Re numbers and volume fractions of nanoparticles (0.01 ≤ Φ ≤ 0.04) on the heat transfer and fluid flow characteristics such as average Nu number, pressure drop (ΔP) and Darcy friction factor (f) were investigated.

TiO2-Ag/blood hybrid nanofluid flow through an artery with applications of drug delivery and blood circulation in the respiratory system

“…Simply put, a nanofluid is a fluid involving nanometer-sized particles called nanoparticles (Sheikholeslami et al , 2019a). These nanoparticles are generally made of metals, oxides, carbides or CNTs (Hayat et al , 2018; Senay et al , 2019; Khamis et al , 2015). Frequent base fluids consist of water, ethylene glycol and oil which have been used by many researchers (Sheikholeslami et al , 2019b; Akbar, 2015; Sheikholeslami and Zeeshan, 2018).…”

Hydrodynamic and thermal analysis of water, ethylene glycol and water-ethylene glycol as base fluids dispersed by aluminum oxide nano-sized solid particles

“…They studied the effects of the Rayleigh number, fin length, oscillating amplitude, oscillating period, thermal conductivity ratio (fin to fluid) and the non-dimensional Young's modulus. Other research studies can be found in literature (Ghalambaz and Noghrehabadi, 2014; Ghalambaz et al , 2014a, 2014b, 2019; Noghrehabadi et al , 2012a, 2012b, 2012c, 2013a, 2013b, 2014; Mansour et al , 2016; Ahmed et al , 2013; EL-Kabeir et al , 2007; Rashad, 2008; Rashad et al , 2011, 2017a, 2017b; Gorla et al , 2011; Sivasankaran et al , 2016; Liu et al , 2019; Aly and Pop, 2019; Nasrin et al , 2019; Sreedevi et al , 2019; Hayat et al , 2015; Mohammed et al , 2012; Makinde (2013); Şenay et al , 2019; Prakash and Agrawal, 2016; Rajesh et al , 2017; Khamis et al , 2015; Alsabery et al , 2019; Vemula et al , 2016; Fornalik-Wajs et al , 2019; Sun and Pop, 2014; Malvandi et al , 2017; Thumma et al , 2017; Rawat et al , 2019; Venkateswarlu et al , 2019a, 2019b). In these research works, different nanofluid parameters and various numerical and experimental models were addressed.…”

Heat Transfer Enhancement of Different Channel Geometries Using Nanofluids and Porous Media

“…However, in addition the geometrical parameters, several parameters were examined by many researchers to enhance the heat transfer rate and these parameters include pipes material, working fluid and porous media. Nanofluids are anemometric particle dispersions (typically less than 100 nm in diameter), called nanoparticles, in a base fluid in order to improve certain properties [25][26][27][28]. The first fluid dispersed by nanoparticles was prepared by Choi and Eastman in 1995 [25].…”

“…The first fluid dispersed by nanoparticles was prepared by Choi and Eastman in 1995 [25]. A number of authors have done experimental and theoretical research on improving heat-transfer with nanofluids [26][27][28][29][30][31] and their results have shown that the heat-transfer rate of nanofluids is higher than that of base fluids (pure water). Much is being done about the Al2O3 nanofluid, which is being investigated experimentally by Kim et al [32] on the effect of the nanofluid on the heat-transfer through a circular tube using Al2O3 nanoparticles in a turbulent regime.…”