Mixed convection due to rotating cylinder in an internally heated and flexible walled cavity filled with SiO 2 –water nanofluids: Effect of nanoparticle shape

Selimefendigil, Fatih; Öztop, Hakan F.; Abu‐Hamdeh, Nidal H.

doi:10.1016/j.icheatmasstransfer.2015.12.007

Cited by 83 publications

(37 citation statements)

References 41 publications

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“…Moreover, increase in an average Nusselt number as increases in the cylinder size of the mixed convection case for various Richardson number was observed [12]. Furthermore, the nanoparticle volume fraction [13]- [16], cylinder rotation speed [16]- [18] and the Reynolds number [17]- [19] were found significantly influenced the heat transfer rate of rotating cylinder. In spite of the enhancement in the heat transfer rate, increases in the thickness of thermal boundary layer was also observed as the effect of the increment in the nanoparticle volume/weight fraction for infinite single rotating tube [19]- [21].…”

Section: Introductionmentioning

confidence: 98%

Heat transfer of the TiO2/water nanofluid in an annulus of the finite rotating cylinders

Rahman¹,

Saad²,

Idris³

et al. 2018

IJHT

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Study on the heat transfer of TiO2/water nanofluid flows inside annulus of the finite rotating cylinders was done numerically. Inner shaft and outer tube were rotated in co-rotating and counter-rotating direction. The k-epsilon turbulent model and the Mixture-multiphase model were used to treats the turbulence flow and the multiphase flows of the TiO2/water nanofluid, respectively. Results of the current work are in agreement with published work. Results showed that increased in Reynolds number the Nusselt number increases. The distribution of the Nusselt number at the specific location along the heated inner shaft for co-rotating and counter-rotating cases shows a different distribution profile. The counter-rotating case was found to be more efficient in enhancing the heat transfer rate in comparison to the co-rotating case. This observation is suggested because of the boundary layers disturbances that originate from the additional vortices produced by the competing rotational speed between inner shaft and outer tube.

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Section: Introductionmentioning

confidence: 98%

Heat transfer of the TiO2/water nanofluid in an annulus of the finite rotating cylinders

Rahman¹,

Saad²,

Idris³

et al. 2018

IJHT

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“…Selimefendigil and Oztop [16] performed a numerical study of pulsating nanofluid flow over a backward-facing step and showed that the frequency of the pulsation and nanoparticle volume fraction enhanced the average heat transfer. In the literature, there are a few studies investigating the effects of nanoparticle shape on the convective heat transfer characteristics in various thermal engineering applications [17][18][19]. Vanaki et al [19] performed a numerical study for the convective heat transfer in a wavy channel with different SiO 2 nanoparticle shapes with ethylene glycol.…”

Section: Introductionmentioning

confidence: 99%

Forced Convection of Pulsating Nanofluid Flow over a Backward Facing Step with Various Particle Shapes

Chamkha

Selimefendigil

2018

Energies

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In this study, numerical analysis of forced convective pulsating nanofluid flow over a backward-facing step with different nanoparticle shapes was performed by the finite volume method. The effects of the Strouhal number (between 0.1 and 2), solid nanoparticle volume fraction (between 0 and 0.04) and nanoparticle shapes (spherical, blade and cylindrical) on the heat transfer and fluid flow were examined with the aid of numerical simulation. It was observed that the average Nusselt number is a decreasing function of the Strouhal number for the considered range, and it enhances for higher solid particle fractions. Using nanofluids with spherical particles is advantageous in pulsating flow, whereas cylindrically-shaped particles are preferred in steady flow configurations. Average Nusselt number enhancements up to 30.24% and 27.95% are achieved with cylindrical- and spherical-shaped particles at the highest volume fraction.

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“…It was observed that with the increasing the Reynolds number, the average heat transfer rises and this consequence is more pronounced with a greater angle of the magnetic field. Selimefendigil and colleagues numerically studied mixed convection in a cavity with an inner rotating cylinder and a flexible wall filled with SiO 2 nanofluid. The results illustrated that by enhancing the external Rayleigh number, both elastic modulus of the flexible wall and internal Rayleigh number decrease but the local and the average Nusselt number increase.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of the effects of geometric parameters of heaters on mixed covection in a lid‐driven cavity filled with different nanofluids

Salari

Mohammadtabar

2017

Heat Trans. Asian Res.

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Mixed convection due to rotating cylinder in an internally heated and flexible walled cavity filled with SiO 2 –water nanofluids: Effect of nanoparticle shape

Cited by 83 publications

References 41 publications

Heat transfer of the TiO2/water nanofluid in an annulus of the finite rotating cylinders

Heat transfer of the TiO2/water nanofluid in an annulus of the finite rotating cylinders

Forced Convection of Pulsating Nanofluid Flow over a Backward Facing Step with Various Particle Shapes

Numerical investigation of the effects of geometric parameters of heaters on mixed covection in a lid‐driven cavity filled with different nanofluids

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