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

Khoshvaght-Aliabadi, M.; Sadri, Rad; Hormozi, Faramarz

doi:10.1016/j.jtice.2015.05.029

Cited by 47 publications

(6 citation statements)

References 29 publications

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“…They found that the mixture model can properly simulate such problem. This is consistent with the results reported by Khoshvaght‐Aliabadi et al 31,32 …”

Section: Introductionsupporting

confidence: 93%

“…They found that the mixture model can properly simulate such problem. This is consistent with the results reported by Khoshvaght-Aliabadi et al 31,32 However, the above survey shows that less focus has been put on the coil-tube as the core section of the heat extraction system, while increasing the thermal performance of this section can noticeably improve the efficiency of the solar ponds and makes their application more economic. The coil-tubes can be made in many different configurations.…”

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confidence: 91%

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Enhancement of heat extraction from solar ponds by using twisted coil‐tubes

Rawa

Al‐Turki

Abu‐Hamdeh

et al. 2021

Env Prog and Sustain Energy

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Generally, coil-tubes are utilized to extract heat from solar ponds. There are different coil-tubes in which their thermal and hydraulic characteristics depend on configuration and geometrical parameters. In this study, the performance of three well-known coil-tubes, namely helical, colubrine, and spiral, as the core of solar ponds is investigated at both smooth and twisted forms. Moreover, different levels of coil-pitches and twist-lengths are examined to explore the effects of geometrical parameters.

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“…They found that the mixture model can properly simulate such problem. This is consistent with the results reported by Khoshvaght‐Aliabadi et al 31,32 …”

Section: Introductionsupporting

confidence: 93%

supporting

confidence: 91%

Enhancement of heat extraction from solar ponds by using twisted coil‐tubes

Rawa

Al‐Turki

Abu‐Hamdeh

et al. 2021

Env Prog and Sustain Energy

View full text Add to dashboard Cite

show abstract

“…In some cases, the heat transfer improvement may be of more importance, and the addition of conventional longitudinal fins may not be sufficient for a compact heat exchanger design. Therefore, researchers have come up with a variety of ways to improve heat transfer performance which include modifying the flow geometry with unconventional designs, which include the use of wavy tubes [1][2][3][4], elliptical tubes [5][6][7], and square tubes [8,9]. Additional research area for improving heat transfer includes studying the use of thermally enhanced fluids such as nanofluids [9,10] and magnetohydrodynamic (MHD) nanofluids [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Angled Fins in Generating Swirling Flows with Vortices That Augment Heat Transfer Performance in an Annular Conduit

Nair,

Tan,

Wang

et al. 2023

International Journal of Energy Research

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This paper examined the usage of thermally conductive angled fins within an annular conduit through numerical simulation. Despite the thermally conductive nature of the fins increasing heat transfer surface area, this investigation found that using an optimal fin angle can promote the generation of vortical structures which aid heat transfer. Using ANSYS-Fluent with the SIMPLEC algorithm and the SST κ − ω turbulence model, this research found that heat transfer performance improved considerably when the generated vortices were sufficiently large and robust. However, the type of generated vortex had a profound impact when optimising for higher performance evaluation criterion (PEC) values. Longitudinal vortices improved heat transfer performance with a low impact on pressure drop increase, unlike transverse vortices, which increased pressure drop significantly. The fin angles of 50° and 60° yielded high heat transfer performance without much increase in pressure drop, thus resulting in higher PEC values. Additionally, using fin heights that correlate to 20% to 60% of the gap between the concentric walls was ideal when designing heat exchangers to achieve higher PEC values. The results of this numerical investigation have been validated both theoretically and experimentally to ensure accurate reporting of the findings.

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“…Results indicated that the condensation process of flow can be empowered by enhancement of the roughness height. Khoshvaght-Aliabadi et al [18][19][20][21] performed experimental studies for forced convective flows of different nanofluids through a corrugated wavy channel and discussed the effects of different geometrical parameters and composition of fluid mixtures. Subsequently, laminar convection through the straight minichannel and wavy minichannel with various cross-section geometries was studied numerically, and the results depicted higher values of the heat transfer rate and pumping power for the wavy minichannel compared to the straight minichannel.…”

Section: Introductionmentioning

confidence: 99%

Forced Convection Heat Transfer in V-Pattern Folded Core Sandwich Structures

Zhijin

Zhou

2022

International Journal of Aerospace Engineering

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Fully developed laminar flow and heat transfer performance of V-pattern folded core sandwich structures subjected to forced convection are numerically investigated. Based on the periodic feature of folded core, a methodology to simulate the fully developed flow and heat transfer state with a few unit cells is developed. The influences of geometric parameters on the coolant flow resistance and heat transfer behaviour are evaluated. Afterwards, approximate models are established based on design to optimize the heat dissipation efficiency. Design variables considered are geometric parameters of the V-pattern folded core, while the corresponding relative density is taken as a constraint. The simulation results show that the presented methodology makes it possible to analyse the fully developed regime with less computing resources. It is found that both pressure drop and heat transfer rate increase with the tortuosity of the flow channel and the inclination of the folded core. The optimization generates a design with a mildly tortuous feature in the streamwise direction to gain a maximum of heat dissipation efficiency under the current conditions.

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

Cited by 47 publications

References 29 publications

Enhancement of heat extraction from solar ponds by using twisted coil‐tubes

Enhancement of heat extraction from solar ponds by using twisted coil‐tubes

The Effect of Angled Fins in Generating Swirling Flows with Vortices That Augment Heat Transfer Performance in an Annular Conduit

Forced Convection Heat Transfer in V-Pattern Folded Core Sandwich Structures

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