Analysis of unsteady mixed convection of Cu–water nanofluid in an oscillatory, lid-driven enclosure using lattice Boltzmann method

Ardalan, Mostafa Valizadeh; Alizadeh, Rasool; Fattahi, Abolfazl; Rasi, Navid Adelian; Doranehgard, Mohammad Hossein; Karimi, Nader

doi:10.1007/s10973-020-09789-3

Cited by 61 publications

(7 citation statements)

References 49 publications

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“…Solar collectors require structural changes as well as efficient geometry. Over the last few decades, global warming, ozone layer depletion, and rising sea levels have been just a few of the irreversible environmental consequences of human activity [ 120 , 121 ]. In recent years, many modifications have tried to improve the efficiency of solar systems.…”

Section: Effect Of Cavities In Solar Collectorsmentioning

confidence: 99%

The Impact of Cavities in Different Thermal Applications of Nanofluids: A Review

et al. 2023

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Nanofluids and nanotechnology are very important in enhancing heat transfer due to the thermal conductivity of their nanoparticles, which play a vital role in heat transfer applications. Researchers have used cavities filled with nanofluids for two decades to increase the heat-transfer rate. This review also highlights a variety of theoretical and experimentally measured cavities by exploring the following parameters: the significance of cavities in nanofluids, the effects of nanoparticle concentration and nanoparticle material, the influence of the inclination angle of cavities, heater and cooler effects, and magnetic field effects in cavities. The different shapes of the cavities have several advantages in multiple applications, e.g., L-shaped cavities used in the cooling systems of nuclear and chemical reactors and electronic components. Open cavities such as ellipsoidal, triangular, trapezoidal, and hexagonal are applied in electronic equipment cooling, building heating and cooling, and automotive applications. Appropriate cavity design conserves energy and produces attractive heat-transfer rates. Circular microchannel heat exchangers perform best. Despite the high performance of circular cavities in micro heat exchangers, square cavities have more applications. The use of nanofluids has been found to improve thermal performance in all the cavities studied. According to the experimental data, nanofluid use has been proven to be a dependable solution for enhancing thermal efficiency. To improve performance, it is suggested that research focus on different shapes of nanoparticles less than 10 nm with the same design of the cavities in microchannel heat exchangers and solar collectors.

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Section: Effect Of Cavities In Solar Collectorsmentioning

confidence: 99%

The Impact of Cavities in Different Thermal Applications of Nanofluids: A Review

et al. 2023

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“…They discovered that the heat transfer rate drops when the Hartmann number rises and that as the Richardson number increases, the Nusselt number rises, and the heat transfer rate is enhanced. Using the lattice Boltzmann method, Valizadeh Ardalan et al (2021) tackled the problem of mixed convection inside an oscillatory lid-driven cavity. It was observed that lowering the Ri and increasing the volume fraction lead to an improvement in the heat transfer rate.…”

Section: Introductionmentioning

confidence: 99%

Unsteady numerical investigation of nanofluid mixed convection within a cubic cavity with periodic motion of double oscillatory walls

Nouari

El-Hafad

Lafdaili

et al. 2022

HFF

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Purpose The purpose of this study is to investigate the impact of the oscillatory movement on heat transfer within a double periodic lid-driven cubic enclosure filled with copper-water nanofluid and to figure out how the oscillations impact the fluid flow and thermal behavior inside the enclosure. The authors asserted that this study will help to improve the heat transfer efficiency and the thermal performance of various technical engineering equipments. Design/methodology/approach The cubic enclosure is heated differentially; the left side is cold, the right one is warm and the remaining walls are insulated. Based on the movement directions of the upper and bottom lids, two cases for lid-driven walls are examined (Case 1: same movement for both lids; Case 2: opposite movement for the lids). The finite volume approach was implemented to solve the time-dependent three-dimensional momentum and energy equations, adopting the power low as a scheme of resolution. The numerical study was carried out for a range of parameters: volume fraction (0 ≤ φ ≤ 0.06), Richardson number (0.1 ≤ Ri ≤ 10), non-dimensional lid frequency (2π/50 ≤ Ω ≤ 2π/10) and fixed Grashof number 105. Findings The numerical simulations were executed for two different cases of the direction of the motion of the oscillatory lids. Based on the findings obtained, decreasing the Richardson number with low lids frequency gives the best heat transfer enhancement for both cases. Furthermore, in the same conditions, swapping from Case 2 to Case 1 leads to enhancing the maximum average Nusselt number obtained by 29.74%. At a high Richardson number, using high lids frequency increases the heat transfer rate compared to using low lids frequency (an enhancement of 4.32% for Case 1 and 3.63% for Case 2). The best heat transfer rate was established for Case 1 when the lids move positively, transporting the cold flow to the hot side. In all cases, increasing the concentration of nanoparticles improves the heat transfer. Originality/value The current study gives an understanding of the problem of mixed convection in a cubic enclosure with oscillatory walls, which has received little attention. And also, there has been no study published on unsteady mixed convection within a double oscillatory lid-driven cavity.

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“…This method has been successfully applied as a new alternative to solve complex fluid flow problems as thermal flows [8], micro flows [9], multiphase flows [10] and fluid-interactions [11]. The LBM has been extended to simulate nanofluids flow [12,13]. The present numerical study is motivated by the success of recent developments of nanofluid flow simulation by using the LBM method.…”

Section: Introductionmentioning

confidence: 99%

MRT LBM Simulation on Friction Reduction by Lubrication Nanoadditives

Salah¹,

Bahraoui²,

Hrour³

2022

IJHT

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Using Tungsten disulfide WS2 nanoparticles as a nanolubricant additive could improve the lubrication performance. The main objective of the present work is to numerically study the effect of nanoparticle diameters on the friction reduction on two sliding surfaces in a lubrication system. The studied nanofluid is 5W-30 engine oil based on WS2 nanoparticles. In this study, the flow of confined nanofluid by two moving surfaces is simulated by the Lattice Boltzmann method with multiple relaxation times. The results show that the greatest friction reduction is always obtained for large diameter nanoparticles.

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Analysis of unsteady mixed convection of Cu–water nanofluid in an oscillatory, lid-driven enclosure using lattice Boltzmann method

Cited by 61 publications

References 49 publications

The Impact of Cavities in Different Thermal Applications of Nanofluids: A Review

The Impact of Cavities in Different Thermal Applications of Nanofluids: A Review

Unsteady numerical investigation of nanofluid mixed convection within a cubic cavity with periodic motion of double oscillatory walls

MRT LBM Simulation on Friction Reduction by Lubrication Nanoadditives

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