Effects of novel hybrid nanofluid (TiO2–Cu/EG) and geometrical parameters of triangular rib mounted in a duct on heat transfer and flow characteristics

Ekiciler, Recep

doi:10.1007/s10973-020-09913-3

Cited by 30 publications

(8 citation statements)

References 58 publications

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“…Ekiciler [16] has prepared a HNF comprising a mixture of titanium dioxide, copper, and ethylene glycol to numerically inspect the heat transfer characteristics and fluidity in a duct with a triangular rib. The comparisons were made with pure ethylene glycol and the base fluid modified by INPs.…”

Section: Literature Reviewmentioning

confidence: 99%

Finite Element Based Comparative Analysis of Positive Streamers in Multi Dispersed Nanoparticle Based Transformer Oil

Bhatt

2021

Int. j. eng. technol. innov.

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The dispersion of dissimilar nanoparticles (NPs) in transformer oil (TO) has a major impact on fast propagating positive streamers. This work investigates the positive streamer dynamics in TO modified by dispersing both Fe3O4 and Al2O3 NPs at a homogenous concentration. The hydrodynamic drift diffusion model of positive streamer evolution and propagation are solved using the commercial software package COMSOL Multiphysics. The impact of multiple NPs (MNPs) has been analysed for streamer propagation, electric field intensity, electron density, and space charge density of modified TO. MNPs successfully reduce streamer propagation velocity by 50%, 17%, and 37.5% comparing to pure oil, Fe3O4 based nanodielectric fluids (NDFs), and Al2O3 based NDFs, respectively. The spatial distribution of electron density reveals the loss of electrons from the ionization region until the saturation of NPs. A comparative study demonstrates that MNPs significantly alter the streamer dynamics and augment the dielectric strength of TO compared to individual NPs.

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Section: Literature Reviewmentioning

confidence: 99%

Finite Element Based Comparative Analysis of Positive Streamers in Multi Dispersed Nanoparticle Based Transformer Oil

Bhatt

2021

Int. j. eng. technol. innov.

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“…Haider et al [11] examined nanofluid transport in a Darcy-Forchheimer permeable space through a rotating plate. Few studies of hybrid nanoliquids with different geometries are provided in [12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation for Radiative Transport in Magnetized Flow of Nanofluids due to Moving Surface

Waqas

Khan

Alghamdi

et al. 2021

Mathematical Problems in Engineering

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In this article, we examined the magnetized flow of ethylene glycol- 50 − 50 % water-based nanoliquids comprising molybdenum disulfide ( MoS 2 ) across a stretching sheet. Flow properties were examined under the impacts of magnetic field and thermal radiation. The behavior of heat generation/absorption is also accounted. Similarity transformations are used on the system of PDEs to get nondimensional ODEs. The obtained nondimensional ODEs are solved with the help of the Runge–Kutta–Fehlberg method via computational software MATHEMATICA. The behavior of prominent parameters for velocity and thermal profiles is plotted graphically and discussed in detail. It is depicted that the temperature field is upgraded with increase in the heat generation/absorption parameter. Furthermore, a larger Schmidt number causes reduction in the concentration field. The current formulated model may be useful in biomedical engineering, biotechnology, nanotechnology, biosensors, crystal growth, plastic industries, and mineral and cleaning oil manufacturing.

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“…Tapered ribs with reduced in the direction of flow were found to provide higher thermal performance than square ribs (Wang and Sudden, 2007). Ekiciler (2021) studied heat and flow characteristics with the RNG kepsilon turbulence model in a triangular rib roughened channel, using four different fluids under turbulent forced convection conditions. There are few studies on aero-thermal effects of rib shapes, in the literature because old production techniques limited the production of some rib shapes.…”

Section: Introductionmentioning

confidence: 99%

Effect of Rib Shape on Flow Regime and Heat Transfer

Durmuş

2021

Black Sea Journal of Engineering and Science

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In current study, flow behavior and heat transfer properties in a square channel roughened with square, right triangle, isosceles triangle and circular ribs were examined. The validation test was performed for an experimental square rib case with a pitch ratio (P/e) of 9 and a blockage ratio (e/H) of 0.1. Only to examine the rib shape factor; height, base width, and rib spacing were taken the same in all cases. The study investigated the effect of various rib shapes on flow characteristics, overall thermal performances, normalized heat transfer distributions, and friction factors (pressure losses) at Reynolds numbers of 30,000 and 60,000. As a result of the numerical study, it was found that the rib shape effect did not cause as big differences in the flow properties as the blockage ratio (rib height) and pitch ratio (rib spacing) effect. In terms of the average Nusselt number enhancement, the right triangular ribbed case performed best, circular ribbed case performed worst, while the isosceles ribbed case performed better than square ribbed case. The isosceles ribbed case and right triangular ribbed case cause higher friction factor and pressure loss, while minimum friction is obtained in circular ribbed case and then in square ribbed case. As a result, in terms of overall thermal performances, right triangular ribbed case provided the best performance, followed by isosceles triangular ribbed case. The circular ribbed case produced less friction than the square ribbed case. The thermal performance of the square ribbed case was slightly higher than that of circular ribbed case.

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Effects of novel hybrid nanofluid (TiO2–Cu/EG) and geometrical parameters of triangular rib mounted in a duct on heat transfer and flow characteristics

Cited by 30 publications

References 58 publications

Finite Element Based Comparative Analysis of Positive Streamers in Multi Dispersed Nanoparticle Based Transformer Oil

Finite Element Based Comparative Analysis of Positive Streamers in Multi Dispersed Nanoparticle Based Transformer Oil

Numerical Investigation for Radiative Transport in Magnetized Flow of Nanofluids due to Moving Surface

Effect of Rib Shape on Flow Regime and Heat Transfer

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