Numerical Study of Heat Transfer Due to Twinjets Impingement onto an Isothermal Moving Plate

Başaran, Anıl; Selimefendigil, Fatih

doi:10.3390/mca18030340

Cited by 11 publications

(5 citation statements)

References 13 publications

(15 reference statements)

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“…Laminar convective heat transfer on an isothermal moving plate due to twin impinging slot jets with a nanofluid was reported by Başaran and Selimefendigil [25]. The results showed that the heat transfer increased with the plate velocity, Reynolds number, and the volumetric concentration of nanoparticles.…”

Section: Introductionmentioning

confidence: 76%

“…The review noted that an impinging jet on a moving plate has been widely studied for different flow regimes and fluids, as highlighted in Table 1. However, apart from the works presented by Başaran and Selimefendigil [25] and Ersayın and Selimefendigil [26], the use of nanofluids in an impinging jet on a moving plate in a turbulent regime with nanofluids has not been fully addressed. It seems to the best of the authors' knowledge that there are no papers on an impinging jet with nanofluids on a moving plate in a turbulent regime.…”

Section: Introductionmentioning

confidence: 99%

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Thermal and Fluid Dynamic Behaviors of Confined Slot Jets Impinging on an Isothermal Moving Surface with Nanofluids

et al. 2019

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A two-dimensional numerical investigation of turbulent convective heat transfer due to a confined slot jet impinging on an isothermal moving surface is accomplished. The confined geometry has an upper adiabatic surface parallel to the heated moving plate and the slot jet is in the middle of the confining adiabatic wall. The working fluids are pure water or a nanofluid, which in this case was a mixture of water and Al2O3 nanoparticles. The governing equations are written adopting the k-ε turbulence model with enhanced wall treatment and the single-phase model approach for the nanofluids. The numerical model is solved using the finite volume method with the Ansys Fluent code. Two geometric configurations regarding two values of the jet distance from the target surface are considered in the simulations. The concentration of nanoparticles ranges from 0% to 6%, with a single diameter equal to 30 nm, Reynolds numbers ranging from 5000 to 20000, and a moving surface-jet velocity ratio between 0 and 2 are examined in the investigation. The aim is to study the system behaviors by means of local and average Nusselt numbers, local and average friction factor/skin friction factor, stream function, and temperature fields. Results show that the presence of nanoparticles determines an increase in the dimensionless heat transfer but, as expected, does not affect the friction factor. The local and average increase in Nusselt numbers is also due to a combined effect of the moving plate and nanofluids.

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Section: Introductionmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Thermal and Fluid Dynamic Behaviors of Confined Slot Jets Impinging on an Isothermal Moving Surface with Nanofluids

et al. 2019

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“…From this aspect, with impinging jet, the flows are commonly used as a low-cost cooling method in various applications including heat treatment of metals, metal annealing, metal sheet fabrication, cooling the gas turbine blades, turbine seals, highdensity electronic chips, solar cells, internal combustion engines, drying the fabrics and paper, etc. [1,2].…”

Section: Introductionmentioning

confidence: 99%

Numerical Determination Of Cooling Performance On Heat Sink Using Impingement Jet

Karabey

AL-ANI

2023

Düzce Üniversitesi Bilim Ve Teknoloji Dergisi

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The use of impingement jet technics drew significant attention of researchers in the recent period. In this method, significant heat transfer rates are achieved. The present study examined the cooling performance of the fin pairs, which are aligned in a consecutively enlarging-contracting pattern and have a rectangular geometry, on a heat sink. The target geometry was optimized in the previous study by using the Taguchi method. The analyses were performed using four different impingement jet velocities (10, 12, 14, and 16 m/sec.), three different nozzle diameters (D=50, 63, and 75 mm), three different heat flux values (q=2222, 3333, and 4444 W/m2), and constant nozzle-to-target distance (h/d=1) were analyzed. These results were simulated numerically by using the ANSYS Fluent software. The k-ε realizable turbulence model was selected as the best model. The numerical results showed that the mean Nusselt number is directly proportional to the increase in the Reynolds number. The Nusselt number also increased with the increasing nozzle diameter value. The results are illustrated graphically (Nu-Re) in the present study. The peak value of the local Nusselt number was found to be at the stagnation point.

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“…The relations for splashing, however, were developed using droplets composed of pure fluids or fluid solutions. In the last decade, nanofluids, which are liquid dispersions containing nanoparticles with diameter less than 100 nm, have been proposed for a large number of applications as a way to enhance cooling with impinging jets [26][27][28], and sprays [3,[29][30][31] owing to their enhanced thermal properties. Nevertheless, no investigation has been performed to evaluate the impact of the nanofluids, and in particular of the nanoparticle load in the bulk fluid, on splashing.…”

Section: Introductionmentioning

confidence: 99%

Spreading-splashing transition of nanofluid droplets on a smooth flat surface

Aksoy,

Eneren,

Koos

et al. 2021

Preprint

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Hypothesis: Even a small fraction of nanoparticles in fluids affects the splashing behavior of a droplet upon impact on a smooth surface.Experiments: Nanofluid drop impact onto a smooth sapphire substrate is experimentally investigated over wide ranges of Reynolds (10 2 < Re < 10 4 ) and Weber (50 < We < 500) numbers for several nanofluid concentrations (0.01% < φ < 1%) using high-speed photography. Nanofluid suspensions are prepared at different nanoparticle concentrations by diluting a commercial Al2O3-water nanofluid without dispersants in aqueous glycerol. Every sample is experimentally characterized in terms of density, viscosity, and surface tension to demonstrate the observed outcomes on the We-Re maps.Findings: The non-monotonous behavior of the spreading-to-splashing boundary remains the same for nanofluids. However, nanofluids influence this boundary either positively or negatively depending on the Reynolds number; the nanofluids suppress splashing at high Reynolds numbers whereas they promote splashing at low Reynolds numbers. We have explained this behavior caused by the addition of nanoparticles as resulting from an increase in the lamella expansion speed during the initial spreading stage. Finally, we developed an empirical relationship to describe the dependence of the splashing threshold to the nanoparticle concentration for the first time. Highlights• We-Re map is plotted for various nanofluid concentrations.

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Numerical Study of Heat Transfer Due to Twinjets Impingement onto an Isothermal Moving Plate

Cited by 11 publications

References 13 publications

Thermal and Fluid Dynamic Behaviors of Confined Slot Jets Impinging on an Isothermal Moving Surface with Nanofluids

Thermal and Fluid Dynamic Behaviors of Confined Slot Jets Impinging on an Isothermal Moving Surface with Nanofluids

Numerical Determination Of Cooling Performance On Heat Sink Using Impingement Jet

Spreading-splashing transition of nanofluid droplets on a smooth flat surface

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