HEAT TRANSFER ENHANCEMENT IN AN EQUILATERAL TRIANGULAR DUCT BY USING AN Al2O3/WATER NANOFLUID: EFFECT OF NANOPARTICLE SHAPE AND VOLUME FRACTION

Ekiciler, Recep; Çetinkaya, Muhammet Samet Ali; Arslan, Kamil

doi:10.1615/heattransres.2020031594

Cited by 13 publications

(3 citation statements)

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“…It is possible that the effect of nanoparticle shape on heat transfer coefficient is more complicated than just the enhancement in thermal conductivity from the addition of the nanoparticles. Ekiciler et al [100] performed a numerical simulation of Al 2 O 3 -water nanofluids with various nanoparticle shapes, including blade, brick, cylinder, platelet, and spherical. The simulation was conducted for flows in a triangular duct with a hydraulic diameter of 8 mm and a length of 1 m. A constant heat flux was applied in the simulation on laminar flows with a Reynolds number ranging from 100 to 500.…”

Section: Effects Of Nanoparticle Shape On the Heat Transfer Coefficientmentioning

confidence: 99%

Nanofluid Heat Transfer: Enhancement of the Heat Transfer Coefficient inside Microchannels

et al. 2022

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The purpose of this paper is to investigate the effects of a connector between two microchannels, for the first time. A brief literature review is provided to offer a better understanding on the impacts of concentration and the characteristics of nanoparticles on thermal conductivity, viscosity, and, consequently, the heat transfer coefficient inside the microchannels. The given literature review aims to help engineer nanofluids to enhance the heat transfer coefficient inside the microchannels. In this research, Fe₃O₄ nanoparticles were introduced into the base liquid to enhance the heat transfer coefficient inside the microchannels and to provide a better understanding of the impact of the connector between two microchannels. It was observed that the connector has a significant impact on enhancing the heat transfer coefficient inside the second microchannel, by increasing the level of randomness of molecules and particles prior to entering the second channel. The connector would act to refresh the memory of the fluid before entering the second channel, and as a result, the heat transfer coefficient in the second channel would start at a maximum value. Therefore, the overall heat transfer coefficient in both microchannels would increase for given conditions. The impacts of the Reynolds number and introducing nanoparticles in the base liquid on effects induced by the connector were investigated, suggesting that both factors play a significant role on the connector’s impact on the heat transfer coefficient.

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Section: Effects Of Nanoparticle Shape On the Heat Transfer Coefficientmentioning

confidence: 99%

Nanofluid Heat Transfer: Enhancement of the Heat Transfer Coefficient inside Microchannels

et al. 2022

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“…The impacts of surface layer, loading velocity and indenter size on nanolaminates mechanism were also justified in this study. Ekiciler et al [10] examined the effect of different shapes of Al 2 O 3 nanoparticles in the flow of water through a triangular duct with various volume fractions. Yadav et al [11] conferred an inclusive review study on the nanoparticles of Carbon nanotubes (CNTs).…”

Section: Introductionmentioning

confidence: 99%

Quasi-Linearization Analysis for Entropy Generation in MHD Mixed-Convection Flow of Casson Nanofluid over Nonlinear Stretching Sheet with Arrhenius Activation Energy

Ali

Faridi²,

Ahmad³

et al. 2022

Symmetry

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Thermal performance of magnetically driven Casson nanofluid over a nonlinear stretching sheet under the influence of entropy, activation energy and convective boundary conditions was analyzed numerically, employing the quasi-linearization method (QLM). The collective behavior of thermophoretic diffusion and Brownian motion along with special effects of viscous dissipation, thermal radiation, heat generation and joule heating are considered in the energy equation for the flow problem. The addition of nanoparticles helps to stabilize the flowing of a nanofluid and maintain the symmetry of the flowing structure. The governing highly nonlinear coupled differential equations of velocity, temperature, concentration and entropy are simulated through an iterative scheme encoded with MATLAB programming language. The geometric model is, therefore, described using a symmetry technique. A comparative analysis of linear and nonlinear stretching in sheets is presented via graphs and tables regarding pertinent dimensionless parameters. It is worth noting that the Nusselt number and Sherwood number decrease at relatively higher rates with growing values of activation energy in the case of nonlinear stretching. Moreover, the entropy generation rate near the stretching surface decreases due to the strong effects of Brownian motion and thermophoretic diffusion while it goes on improving far off the stretching surface.

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“…experimentally investigated the heat transfer characteristic of single-component Fe3O4 and SiC nanoparticles, and the hybrid mixture of Fe3O4 and SiC (volume ratio 50:50) in a double pipe heat exchanger with ethylene glycol and water mixture as the working fluid in turbulent flow regime. A maximum heat transfer enhancement of 98.95% was obtained at a flow rate of 6L/min for the 0.08% hybrid nanofluid Ekiciler et al (2020). numerically simulated forced convective heat transfer of an Al2O3/water nanofluid, having different shapes of nanoparticles including blade, brick, cylindrical, platelet, and spherical, flowing in a 3D equilateral triangular duct.Moosavi et al (2020) numerically studied turbulent forced convection nanofluid flow with water as base fluid, Al2O3 and CuO as nanoparticles over an inclined forward-facing step.…”

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confidence: 99%

Heat Transfer Enhancement-a Brief Review of Literature in 2020 and Prospects

et al. 2021

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This review provides a brief literature survey on enhanced heat transfer research published in the English language journals in 2020. A topic search containing either "heat transfer" or "heat transport" or "thermal transport" in the Web of Science resulted in over 28,000 papers published in 2020 and nearly 30% were relevant to heat transfer intensification, which indicates the importance and rapid development of heat transfer enhancement technologies. The chosen studies focus on various heat transfer enhancement research categorized into conduction, convection, radiation, boiling and condensation, energy storage, thermal management, and cross research involving two or more categories. Heat conduction papers are selected from the micro/nanoscale areas with a focus on interfacial phenomena. Important active, passive, and compound techniques for enhancing convective heat transfer are incorporated. Thermal radiation is concentrated on near-2 field radiation and solar energy. Heat transfer enhancement in boiling and condensation as well as in thermal energy storage, renewable and sustainable energy, and thermal management of electronics and high-end equipment is critical in many engineering applications. From the selected literature published in 2020, significant attempts have been made to research and development on heat transfer enhancement technology covering both conventional and emerging techniques. The prospects of the heat transfer enhancement research are reflected according to the literature survey.Research of innovative heat transfer enhancement techniques is immense, encompassing every aspect from understanding the fundamental theory and physical mechanisms of various heat transfer enhancement techniques to their applications. Research of emerging techniques using new interfacial materials, nanofluids, micro-and nano-structures, microchannels, and new compound enhancement techniques incorporating conventional and new techniques becomes popular.However, there are big challenges in understanding the mechanisms, engineering design methodology and applications with these emerging techniques. Many aspects are urgently needed to be investigated and developed to achieve systematic theory, mechanisms and design methodology for applications in thermal processes, energy storage, renewable energy, decarbonized heating and cooling and many industrial and civil sectors.

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HEAT TRANSFER ENHANCEMENT IN AN EQUILATERAL TRIANGULAR DUCT BY USING AN Al2O3/WATER NANOFLUID: EFFECT OF NANOPARTICLE SHAPE AND VOLUME FRACTION

Cited by 13 publications

References 0 publications

Nanofluid Heat Transfer: Enhancement of the Heat Transfer Coefficient inside Microchannels

Nanofluid Heat Transfer: Enhancement of the Heat Transfer Coefficient inside Microchannels

Quasi-Linearization Analysis for Entropy Generation in MHD Mixed-Convection Flow of Casson Nanofluid over Nonlinear Stretching Sheet with Arrhenius Activation Energy

Heat Transfer Enhancement-a Brief Review of Literature in 2020 and Prospects

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