Numerical analysis on laminar forced convection improvement of hybrid nanofluid within a U-bend pipe in porous media

Moghadasi, Hesam; Aminian, Ehsan; Saffari, Hamid; Mahjoorghani, Milad; Emamifar, Armin

doi:10.1016/j.ijmecsci.2020.105659

Cited by 47 publications

(21 citation statements)

References 51 publications

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“…The model is assumed to be precise with a maximum deviation of 1.04% up to 14% volume fraction. For evaluating the properties of hybrid nanofluid, Equations (1)–(11) were used, which is essentially a modified form of the nanofluid's thermophysical properties 69,70 . The mixture ratio was maintained

{Al}_{2} O_{3}

/water to CuO/water

(ϕ A l_{2} O_{3} ∕ ϕ C u O)

to be 50%/50%.…”

Section: Thermophysical Properties Of the Nanofluidsmentioning

confidence: 99%

Numerical investigation of the thermo‐hydraulic performance of water‐based nanofluids in a dimpled channel flow using Al₂O₃, CuO, and hybrid Al₂O₃–CuO as nanoparticles

Ahmed¹,

Abir

Fuad³

et al. 2021

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In this study, the authors study the impact of spherical dimple surfaces and nanofluid coolants on heat transfer and pressure drop. The main objective of this paper is to evaluate the thermal performance of nanofluids with respect to different Reynolds numbers (Re) and nanoparticle compositions in dimpled channel flow. Water‐based nanofluids with Al 2 O 3, CuO, and Al 2 O 3–CuO nanoparticles are considered for this investigation with 1%, 2%, and 4% volume fraction for each nanofluid. The simulations are conducted at low Reynolds numbers varying from 500 to 1250, assuming constant and uniform heat flux. The effective properties of nanofluids are estimated using models proposed in the literature and are combined with the computational fluid dynamics solver ANSYS Fluent for the analysis. The results are discussed in terms of heat transfer coefficient, temperature distributions, pressure drop, Nusselt number, friction factors, and performance criterion for all the cases. For all cases of different nanoparticle compositions, the heat transfer coefficient was seen as 35%–46% higher for the dimpled channel in comparison with the smooth channel. Besides, it was observed that with increasing volume fraction, the values of heat transfer and pressure drop were increased. With a maximum of 25.18% increase in the thermal performance, the 1% Al 2 O 3/water was found to be the best performing nanofluid at Re = 500 in the dimpled channel flow.

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{Al}_{2} O_{3}

/water to CuO/water

(ϕ A l_{2} O_{3} ∕ ϕ C u O)

to be 50%/50%.…”

Section: Thermophysical Properties Of the Nanofluidsmentioning

confidence: 99%

Numerical investigation of the thermo‐hydraulic performance of water‐based nanofluids in a dimpled channel flow using Al₂O₃, CuO, and hybrid Al₂O₃–CuO as nanoparticles

Ahmed¹,

Abir

Fuad³

et al. 2021

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“…among them, water, oil, ethylene, bio-fluids, and different polymer solutions can be mentioned. Moreover, nanoparticles can include diverse materials such as metals with chemical stability (copper, silver, gold), metal oxides (alumina, titania, silica, zirconia, bismuth oxide), carbon allotropes (diamond, fullerene, single-walled and multi-walled carbon nanotubes), as well as functionalized nanoparticles [19][20][21][22][23]. Even hybrid nanoparticles and nano-fluids can be used for heat transfer [24] and pool boiling enhancement [25,26].…”

Section: Chf Enhancement By Ameliorating Fluid Properties With Nanoparticlesmentioning

confidence: 99%

Recent Advances in the Critical Heat Flux Amelioration of Pool Boiling Surfaces Using Metal Oxide Nanoparticle Deposition

et al. 2020

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Pool boiling is an effective heat transfer process in a wide range of applications related to energy conversion, including power generation, solar collectors, cooling systems, refrigeration and air conditioning. By considering the broad range of applications, any improvement in higher heat-removal yield can ameliorate the ultimate heat usage and delay or even avoid the occurrence of system failures, thus leading to remarkable economic, environmental and energy efficiency outcomes. A century of research on ameliorating critical heat flux (CHF) has focused on altering the boiling surface characteristics, such as its nucleation site density, wettability, wickability and heat transfer area, by many innovative techniques. Due to the remarkable interest of using nanoparticle deposition on boiling surfaces, this review is targeted towards investigating whether or not metal oxide nanoparticles can modify surface characteristics to enhance the CHF. The influence of nanoparticle material, thermo-physical properties, concentration, shape, and size are categorized, and the inconsistency or contradictions of the existing research results are recognized. In the following, nanoparticle deposition methods are presented to provide a worthwhile alternative to deposition rather than nanofluid boiling. Furthermore, possible mechanisms and models are identified to explain the amelioration results. Finally, the present status of nanoparticle deposition for CHF amelioration, along with their future challenges, amelioration potentials, limitations, and their possible industrial implementation, is discussed.

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“…They found that the use of carbon nanotube (CNT)–water as the working fluid increases the rate of heat transfer. Moghadasi et al 22 performed laminar forced convection through a U‐bend pipe in porous media with a hybrid nanofluid. They observed that the Nu M increase with increasing volume fraction and Darcy number.…”

Section: Introductionmentioning

confidence: 99%

Turbulent forced convection and entropy analysis of a nanofluid through a 3D 90° elbow using a two‐phase approach

Korei

Benissaad

2021

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In a scenario characterized by a secondary flow called Dean's vortices, thermal and flow behavior analysis is examined. Forced convection of an Al2O3–water nanofluid through a three‐dimensional (3D) 90° elbow was analyzed numerically using a multiphase mixture model. Turbulence is taken into account by using the shear‐stress transport k–ω model. Also, entropy production is presented to obtain the optimized conditions. Simulation parameters consist of different Reynolds numbers (10,000 ≤ italicRe ≤ 100,000), nanoparticle volume fraction false( 2 % ≤ ϕ ≤ 6 % false), nanoparticle diameter ( 10 ≤ d p ≤ 40 ). The findings reveal that the increase in the ϕ and the Re along with a smaller dp discourages the appearance of Dean vortices in the flow. The pressure drop increases with the increase in the volume fraction and the decrease in the nanoparticles' diameter. The highest NuM is observed at ϕ = 6 % for d p = 10 nm. Significant heat transfer rates are observed near the outer wall. The minimum total entropy production is obtained at Re = 100,000 for ϕ = 2 % and d p = 40 nm.

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Numerical analysis on laminar forced convection improvement of hybrid nanofluid within a U-bend pipe in porous media

Cited by 47 publications

References 51 publications

Numerical investigation of the thermo‐hydraulic performance of water‐based nanofluids in a dimpled channel flow using Al₂O₃, CuO, and hybrid Al₂O₃–CuO as nanoparticles

Numerical investigation of the thermo‐hydraulic performance of water‐based nanofluids in a dimpled channel flow using Al₂O₃, CuO, and hybrid Al₂O₃–CuO as nanoparticles

Recent Advances in the Critical Heat Flux Amelioration of Pool Boiling Surfaces Using Metal Oxide Nanoparticle Deposition

Turbulent forced convection and entropy analysis of a nanofluid through a 3D 90° elbow using a two‐phase approach

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Numerical analysis on laminar forced convection improvement of hybrid nanofluid within a U-bend pipe in porous media

Cited by 47 publications

References 51 publications

Numerical investigation of the thermo‐hydraulic performance of water‐based nanofluids in a dimpled channel flow using Al2O3, CuO, and hybrid Al2O3–CuO as nanoparticles

Numerical investigation of the thermo‐hydraulic performance of water‐based nanofluids in a dimpled channel flow using Al2O3, CuO, and hybrid Al2O3–CuO as nanoparticles

Recent Advances in the Critical Heat Flux Amelioration of Pool Boiling Surfaces Using Metal Oxide Nanoparticle Deposition

Turbulent forced convection and entropy analysis of a nanofluid through a 3D 90° elbow using a two‐phase approach

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Numerical investigation of the thermo‐hydraulic performance of water‐based nanofluids in a dimpled channel flow using Al₂O₃, CuO, and hybrid Al₂O₃–CuO as nanoparticles

Numerical investigation of the thermo‐hydraulic performance of water‐based nanofluids in a dimpled channel flow using Al₂O₃, CuO, and hybrid Al₂O₃–CuO as nanoparticles