Investigation of volume fraction of nanoparticles effect and aspect ratio of the twisted tape in the tube

Akbari, Omid Ali; Afrouzi, Hamid Hassanzadeh; Marzban, Ali; Toghraie, Davood; Malekzade, Hossein; Arabpour, Abedin

doi:10.1007/s10973-017-6372-7

Cited by 131 publications

(27 citation statements)

References 67 publications

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“…For hydrothermal features of cooling methods, many investigations have assessed different micro HSs for laminar and turbulent flow employing air, water, and nanofluids as Newtonian and non‐Newtonian are commonly used. These cooling approaches have been developed by the following techniques—straight flat plate fins, wavy plate fins, vortex generator, grooved tubes, inclined solid ribs, porous media, two‐phase flow, and magnetic field . All these attempts are enhanced by the thermohydraulic performance of different HS designs for more reduction in the weight and volume of electronic, electrical, and solar systems.…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional computational comparison of mini‐pinned heat sinks using different nanofluids: Part two—energy and exergy characteristics

Al‐damook

Alfellag

Khalil

2019

Heat Trans. Asian Res.

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The energy and exergy characteristics of 3D-pinned heat sink (HS) designs have been computationally compared as the second part of a three-part investigation. Different pin profiles, such as circular, square, triangular, strip and elliptic pins, and without pin HS are conducted with three different types of nanofluids-Al 2 O 3 -water, SiO 2 -water, and CuO-water for laminar forced convection. The concentrations of nanofluids vary from 0 to 5 vol% with different Reynolds numbers ranging between 100 and 1000. The finite volume method employing the SIMPLE algorithm for a computational solution is applied to solve the Navier-Stokes and energy equations. Four criterions studies are explained-energy efficiency, exergy loss, and exergy efficiency of HSs with pressure drop. The results showed that the highest energy and exergy efficiencies are nearly 76% and 57%, respectively, for elliptic-pinned HSs using pure water, while about 82% and 62% using 5 vol% of SiO 2 -water nanofluids. Besides, the elliptic-pinned HSs have a favorable reduction in the exergy loss, nearly 17% using 5 vol% of SiO 2 -water nanofluids. Subsequently, the elliptic-pinned HS is recommended to apply with pure water considering the development in pressure drop required. However, the elliptic-pinned HSs could be employed with 5 vol% of SiO 2 -water nanofluids regardless of the development in pressure drop required for thermal energy dissipation applications with more exergy efficiency and reduction of exergy loss. K E Y W O R D Sdifferent nanofluids, different pinned heat sinks, energy and exergy characteristics, exergy loss, thermal energy enhancement

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Section: Introductionmentioning

confidence: 99%

Three‐dimensional computational comparison of mini‐pinned heat sinks using different nanofluids: Part two—energy and exergy characteristics

Al‐damook

Alfellag

Khalil

2019

Heat Trans. Asian Res.

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“…Another solution for smoothing the non-uniform temperature distribution is to enhance the heat transfer on the inner tube wall and increase the transverse mixing, which would reduce the temperature gradient in the tube wall and that of the HTF. The enhancement in heat transfer convection inside a tube has been investigated and tested in the design of tubular heat exchangers [17,18]. For a tubular heat exchanger, the thermal boundary conditions are usually uniform, since the heat source is evenly distributed on the wall of the tube, as presented in the numerical work of Promvonge et al [19], while for the external receiver tube, the thermal boundary conditions are highly non-uniform, as mentioned above.…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis of a Solar External Receiver Tube with a Novel Component of Guide Vanes

Koch

Sarunac

et al. 2021

Energies

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The heat transfer performance of a solar external receiver tube with guide vanes was numerically studied under non-uniform heat flux conditions. Models of the smooth tube and the tube with guide vanes were built. The distributions of the temperature, velocity, turbulence intensity, and Nu predicted by these two models were compared to investigate the heat transfer enhancement and the mixing effect of the guide vanes. The effect of the Re and the α on the heat transfer enhancement was also studied. The results show that the guide vanes form spiraling flows, reduce the maximum tube and molten salt temperatures, and improve the heat transfer. In addition, a more uniform temperature distribution is achieved compared to the smooth tube, allowing the molten salt to work safely under higher heat flux conditions in the receiver tube with guide vanes. It was observed that a larger Re enhances the heat transfer on the tube wall and achieves a longer effective distance of enhanced heat transfer in the downstream region, while the spiraling flow, the heat transfer enhancement, and the mixing are stronger for a larger α.

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“…Using nanoparticles can significantly augment the thermohydraulic performance of the heat exchanger system. Several researchers in the past few years suggested that a combination of nanofluids and twisted tape vortex generators can significantly improve the thermohydraulic efficiency of heat exchangers [27]. Twisted tapes could intensify the turbulent flow disturbance and flow severity between the tube surface and the central region, while the nanofluids could improve the thermophysical properties of the fluid.…”

Section: Introductionmentioning

confidence: 99%

Entropy generation of turbulent Cu–water nanofluid flows inside thermal systems equipped with transverse-cut twisted turbulators

Nakhchi

Rahmati

2020

J Therm Anal Calorim

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Investigation of volume fraction of nanoparticles effect and aspect ratio of the twisted tape in the tube

Cited by 131 publications

References 67 publications

Three‐dimensional computational comparison of mini‐pinned heat sinks using different nanofluids: Part two—energy and exergy characteristics

Three‐dimensional computational comparison of mini‐pinned heat sinks using different nanofluids: Part two—energy and exergy characteristics

Thermal Analysis of a Solar External Receiver Tube with a Novel Component of Guide Vanes

Entropy generation of turbulent Cu–water nanofluid flows inside thermal systems equipped with transverse-cut twisted turbulators

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