The effects of wavy-wall phase shift on thermal-hydraulic performance of Al2O3–water nanofluid flow in sinusoidal-wavy channel

Ahmed, M. A.; Yusoff, Mohd Zamri; Ng, Khai Ching; Shuaib, N. H.

doi:10.1016/j.csite.2014.09.005

Cited by 30 publications

(12 citation statements)

References 24 publications

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“…Results show that using the nanoparticles under pulsating flow promotes the thermal performance. The effect of the Al 2 O 3 -water nanofluid flow on performance of the sinusoidal-wavy channel with different wall phase shifts was investigated by Ahmed et al [10]. Results indicate that the optimal performance is achieved by 0°phase shift channel over the ranges of Reynolds number and nanoparticle volume fraction.…”

Section: Introductionmentioning

confidence: 97%

Al 2 O 3 –water nanofluid inside wavy mini-channel with different cross-sections

Khoshvaght-Aliabadi

Sadri

Hormozi

2016

Journal of the Taiwan Institute of Chemical Engineers

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Section: Introductionmentioning

confidence: 97%

Al 2 O 3 –water nanofluid inside wavy mini-channel with different cross-sections

Khoshvaght-Aliabadi

Sadri

Hormozi

2016

Journal of the Taiwan Institute of Chemical Engineers

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“…The heat transfer behavior of nanofluids is analyzed in this study by evaluating several fundamental parameters, such as local Nusselt number, mean Nusselt number, non-dimensional pressure drop and thermal enhancement factor. Specifically, we define the local Nusselt number at each solid wall of the channel as referred to the thermal conductivity of the base fluid [45,63]. Therefore:…”

Section: Resultsmentioning

confidence: 99%

Nanofluid Heat Transfer in Wavy-Wall Channels with Different Geometries: A Finite-Volume Lattice Boltzmann Study

et al. 2020

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In this work, we perform an extensive numerical investigation of the heat transfer behavior of nanofluid laminar flows, in wavy-wall channels. The adopted computational approach is based on a finite-volume formulation of the lattice Boltzmann method constructed on a fully-unstructured mesh. We show the validity and effectiveness of this numerical approach to deal with realistic problems involving nanofluid flows, and we employ it to analyze the effects of the wavy-wall channel geometry on the rate of heat transfer, thus providing useful information to the design of efficient heat transfer devices. Results show that an increasing of the wavy surface amplitude has a positive effect on the heat transfer rate, while a phase shift between the wavy walls leads to a decreasing of the mean Nusselt number along the channel. The addition of solid nanoparticles within a base liquid significantly contributes to increase the rate of heat transfer, especially when a relatively high value of nanoparticles volume fraction is employed. The present analysis then suggests that the use of nanofluids within an axis-symmetric configuration of the wavy-wall channel, with high wavy surface amplitude, may represent an optimal solution to enhance the thermal performances of heat transfer devices.

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“…For example, the PEC values enhance by about 61%, 71%, and 72% by increasing the nanoparticle concentration in the range of 0 to 0.04 for the straight, triangular, and sinusoidal ducts, respectively. Ahmed et al [42,43] showed that the PEC for wavy channels increases with an increase in the nanoparticle volume fraction for the laminar regime. As shown in Fig.15, the wavy ducts have higher values of PEC in comparison with the straight one for the cases in which nanofluid has been used.…”

Section: First and Second Laws Design Considerationsmentioning

confidence: 99%

Convection of heat and thermodynamic irreversibilities in two-phase, turbulent nanofluid flows in solar heaters by corrugated absorber plates

Akbarzadeh

Rashidi

Karimi

et al. 2018

Advanced Powder Technology

127

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The effects of simultaneous implementation of corrugated walls and nanoparticles upon the performance of solar heaters are investigated. Triangular and sinusoidal wall profiles along with varying concentration of nanoparticles are analyzed. The multi-phase mixture and the SST κ-ω models are used to simulate turbulent nanofluid flows inside the corrugated channels. The staggered computational grid is employed for storing the velocity and pressure terms at cell faces and cell center, respectively. The governing equations are first discretized by employing a second-order upwind differencing technique and are then solved by means of pressure-based finite volume approach. The convergence criterion is also presented for the validation of obtained results. The effects of wall profiles and nanoparticle concentration on the pertinent parameters including Nusselt number, pressure drop, performance evaluation criterion (PEC), and thermal and frictional irreversibilities are studied. This reveals that, in general, the triangular duct features superior heat transfer and inferior hydraulic characteristics in comparison with the

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The effects of wavy-wall phase shift on thermal-hydraulic performance of Al2O3–water nanofluid flow in sinusoidal-wavy channel

Cited by 30 publications

References 24 publications

Al 2 O 3 –water nanofluid inside wavy mini-channel with different cross-sections

Al 2 O 3 –water nanofluid inside wavy mini-channel with different cross-sections

Nanofluid Heat Transfer in Wavy-Wall Channels with Different Geometries: A Finite-Volume Lattice Boltzmann Study

Convection of heat and thermodynamic irreversibilities in two-phase, turbulent nanofluid flows in solar heaters by corrugated absorber plates

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