Conjugated heat transfer and entropy generation of Al2O3–water nanofluid flows over a heated wall-mounted obstacle

Sekrani, Ghofrane; Poncet, Sébastien; Proulx, Pierre

doi:10.1007/s10973-018-7349-x

Cited by 22 publications

(7 citation statements)

References 55 publications

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“…Other experimental correlations are also suggested for higher Reynolds numbers, but for nanofluid flows the mentioned range for particle Reynolds number is sufficient and higher values are not expected to occur. Concerning typical range of particle Reynolds number in nanofluids, Sekrani et al [31] performed a series of numerical simulations for alumina nanoparticles with a size of 47 nm dispersed in water with concentrations up to 1.8% under laminar flow (100≤ Re ≤1600) in a 2D channel. They indicated that for the range of their simulations, Re p changes between 3.5×10 -5 and 6×10 -4 (i.e., much smaller than 1).…”

Section: Drag Forcementioning

confidence: 99%

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Recent advances in modeling and simulation of nanofluid flows-Part I: Fundamentals and theory

et al. 2019

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It has been more than two decades since the discovery of nanofluids-mixtures of common liquids and solid nanoparticles less than 100 nm in size. As a type of colloidal suspension, nanofluids are typically employed as heat transfer fluids due to their favorable thermal and fluid properties. There have been numerous numerical studies of nanofluids in recent years (more than 1000 in both 2016 and 2017, based on Scopus statistics). Due to the small size and large numbers of nanoparticles that interact with the surrounding fluid in nanofluid flows, it has been a major challenge to capture both the macro-scale and the nano-scale effects of these systems without incurring extraordinarily high computational costs.To help understand the state of the art in modeling nanofluids and to discuss the challenges that remain in this field, the present article reviews the latest developments in modeling of nanofluid flows and heat transfer with an emphasis on 3D simulations. In part I, a brief overview of nanofluids (fabrication, applications, and their achievable thermo-physical properties) will be presented first.Next, various forces that exist in particulate flows such as drag, lift (Magnus and Saffman), Brownian, thermophoretic, van der Waals, and electrostatic double layer forces and their significance in nanofluid flows are discussed. Afterwards, the main models used to calculate the thermophysical properties of nanofluids are reviewed. This will be followed with the description of the main physical models presented for nanofluid flows and heat transfer, from single-phase to Eulerian and Lagrangian two-phase models. In part II, various computational fluid dynamics (CFD) techniques will be presented. Next, the latest studies on 3D simulation of nanofluid flow in various regimes and configurations are reviewed. The present review is expected to be helpful for researchers working on numerical simulation of nanofluids and also for scholars who work on experimental aspects of nanofluids to understand the underlying physical phenomena occurring during their experiments.

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Section: Drag Forcementioning

confidence: 99%

“…They indicated that for the range of their simulations, Re p changes between 3.5×10 -5 and 6×10 -4 (i.e., much smaller than 1). The slip velocity magnitude for the experiments of [31] can then be estimated using Eq. (3) using the values of water properties.…”

Section: Drag Forcementioning

confidence: 99%

Recent advances in modeling and simulation of nanofluid flows-Part I: Fundamentals and theory

et al. 2019

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“…Sekrani et al [67] investigated the heat transfer performance and entropy generation of water-based Al2O3 nanofluids flowing within a 2D channel with a heated wall mounted obstacle. The conjugated heat transfer problem was solved in the laminar regime for Reynolds numbers up to 1600 and nanoparticle volume fractions up to 1.8 %.…”

Section: Heat and Nanofluid Transfermentioning

confidence: 99%

Advances of Nanofluids in Solar Collectors - A Review of Numerical Studies

Menni¹,

Chamkha²,

Lorenzini³

et al. 2019

MMEP

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This paper presents a detailed review of the numerical studies carried out by various researchers in order to obtain enhanced heat transfer in free, forced, and mixed convection, under laminar, transition, and turbulent flow regimes, by using nanofluids in different solar collector geometries. Recently, nanofluids have been increasingly used in various solar collector configurations. Nano-sized metallic or non-metallic particles such as Cu, Au, Al2O3, SiO2, TiO2, CuO, etc, were used in the heat transfer fluid for various solid volume fractions. The average size of the particles was less than 100 nm. The higher conductivity of nanoparticles even at low particle concentration results in higher thermal conductivity of the base fluid and improves the thermal characteristics of the system. Nanoparticle size, type and shape are important factors for the thermal conductivity enhancement of the nanofluid with nanoparticles.

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“…The performances of nanofluid flows are difficult to assess, and comparisons between two nanofluids are rarely discussed regarding objective criteria, as their characteristics depend on so many parameters like the nanoparticle size, type and concentration, the geometry of the considered system, and the operating parameters (flow rate, temperature, pressure). Merit criteria should be more systematically used, as was done by Sekrani et al for Al 2 O 3 water-based nanofluids in turbulent pipe flows [44] and laminar channel flows [78]. The most common criteria include:…”

Section: Research Perspectivesmentioning

confidence: 99%

Ethylene- and Propylene-Glycol Based Nanofluids: A Litterature Review on Their Thermophysical Properties and Thermal Performances

Sekrani

Poncet

2018

Applied Sciences

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Nanofluids are considered a promising way to improve the heat transfer capability of base fluids. Water is the most commonly-used heat transfer fluid. However, in refrigeration systems, it may be necessary to mix water with either ethylene- or propylene-glycol to lower its freezing point and prevent from ice formation. In the same way, for car radiators or industrial heat exchangers, the boiling point of water can be pushed up by mixing it with glycol-based fluids. The increasing awareness of energy saving and industrial energy efficiency improvement results in the growing interest in ethylene- or propylene-glycol-based nanofluids for applications in various thermal systems. The present paper proposes an extensive review of the most recent and relevant experimental and numerical works on the thermophysical properties and performances of ethylene- or propylene-glycol-based nanofluids. Research perspectives are also provided with the long-term objective that these nanofluids be more widely considered in real industrial applications.

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Conjugated heat transfer and entropy generation of Al2O3–water nanofluid flows over a heated wall-mounted obstacle

Cited by 22 publications

References 55 publications

Recent advances in modeling and simulation of nanofluid flows-Part I: Fundamentals and theory

Recent advances in modeling and simulation of nanofluid flows-Part I: Fundamentals and theory

Advances of Nanofluids in Solar Collectors - A Review of Numerical Studies

Ethylene- and Propylene-Glycol Based Nanofluids: A Litterature Review on Their Thermophysical Properties and Thermal Performances

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