Natural convection in a trapezoidal enclosure filled with carbon nanotube–EG–water nanofluid

Esfe, Mohammad Hemmat; Arani, Ali Akbar Abbasian; Yan, Wei‐Mon; Ehteram, Hamidreza; Aghaie, Alireza; Afrand, Masoud

doi:10.1016/j.ijheatmasstransfer.2015.08.036

Cited by 127 publications

(11 citation statements)

References 36 publications

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“…Nanoparticles are usually made of metals, oxides or carbon nanotubes (CNTs). Nanofluids have advanced properties that make them conceivably useful in numerous heat transfer applications such as electronics, heat exchangers, heat pipes, solar collectors and so on [2][3][4][5][6]. Since the thermal conductivity of nanoparticles is higher than that of the base fluids, they enhance the thermal conductivity and heat transfer performance of the base fluids significantly.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on thermal conductivity of F-MWCNTs–Fe 3 O 4 /EG hybrid nanofluid: Effects of temperature and concentration

Harandi

Karimipour

Afrand

et al. 2016

International Communications in Heat and Mass Transfer

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314

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In this paper, an experimental study on the effects of temperature and concentration on the thermal conductivity of f-MWCNTs-Fe 3 O 4 /EG hybrid nanofluid is presented. The experiments were carried out for solid volume fraction range of 0 to 2.3% in temperatures ranging from 25°C to 50°C. The results revealed that the thermal conductivity ratio enhances with increasing the solid volume fraction and temperature. Results also showed that, at higher temperatures, the variation of thermal conductivity ratio with solid volume fraction was more than that at lower temperatures. Moreover, the effect of temperature on the thermal conductivity ratio was more noticeable at higher solid volume fractions. The thermal conductivity measurements also showed that the maximum thermal conductivity ratio was 30%, which occurred at temperature of 50°C for solid volume fraction of 2.3%. Finally, for engineering applications, based on experimental results, a precise correlation was suggested to predict the thermal conductivity of f-MWCNTs-Fe 3 O 4 /EG hybrid nanofluids.

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Section: Introductionmentioning

confidence: 99%

An experimental study on thermal conductivity of F-MWCNTs–Fe 3 O 4 /EG hybrid nanofluid: Effects of temperature and concentration

Harandi

Karimipour

Afrand

et al. 2016

International Communications in Heat and Mass Transfer

Self Cite

314

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“…Figures 10,11 show the vertical and the horizontal velocity components along the mid-planes of the cavity for the second case, respectively. The results are for the same parameters as those used in Figures 8,9. For Ri = 100, as a result of the natural convection opposing the movements of the side walls, large velocity gradients exist next to these walls and in boundary layers at the interfaces of central clockwise and the two counterclockwise vortices shown in Figure 6. As Figure 10 shows, the zone at the core of the cavity is relatively stagnant with low-velocity F I G U R E 1 1 Vertical velocity component along the horizontal mid-plane of the cavity for the second case gradients in this case.…”

Section: Resultsmentioning

confidence: 99%

“…Free and mixed convection heat transfer of nanofluids inside different geometries have been studied in many literatures . One of the special cases of these geometries is a square cavity that recently has been considered by many researchers …”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of non‐Newtonian nanofluid mixed convection in a two‐opposite direction lid‐driven cavity with variable properties

Nazari

Akbari

2018

Heat Trans. Asian Res.

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The mixed convection fluid flow in a square cavity filled with AL2O3‐water non‐Newtonian nanofluid is numerically analyzed. The left and right vertical boundaries of the enclosure have been kept in the constant temperature. Remaining walls of the cavity have been considered to have adiabatic boundary condition. Two different cases have been considered. In the first case, left and right side walls have been moved vertically with constant speed Vb in opposite directions. In the second case, the directions of their motions have been reversed. The transport equations, written in terms of the primitive variables for the non‐Newtonian nanofluid, have been solved numerically using the finite volume method. The shear stresses were calculated using the Ostwald‐de Waele model for the shear‐thinning nanofluid. The model introduced by Patel et al was used to obtain the thermal conductivity of the nanofluid. The variation of the fluid flow with respect to the Richardson number and volume fraction of the nanoparticles was investigated through a parametric study. Even though increasing the volume fraction of nanoparticles leads to heat transfer enhancement, for the second case of this study, for Ri = 1, the average Nusselt number initially drops sharply by increasing the volume fraction of nanoparticles, then remains constant.

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“…Other investigations have focused on convection within trapezoidal enclosures filled with nanotubes [14]. After simulations were run for a variety of ratios of different lengths and heights of the enclosure, it was concluded that at a low Rayleigh number, the average Nusselt number decreased when the inclination angle was increased, independent of solid volume fractions.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Temperature and Air Velocity Distribution in a Rectangular Cavity with Insulated Side Walls

Adeleye,

Oni,

Oluwaleye

2023

IJHT

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Heat transfer and fluid flow in cavities is often a result of convection. The study of convection in enclosures, such as rectangular cavities, under different parameters, holds significance in understanding the thermal-hydraulic characteristics, like temperature and air velocity distribution, in systems where heat transfer and fluid flow are involved. This research focuses on the numerical investigation of temperature and air velocity distribution in a rectangular cavity. COMSOL Multiphysics software was utilized to create a model of the cavity, subjecting it to regulated temperatures of 323.0 K, 333.0 K, and 343.0 K at operating times of 0, 300, 900, and 1,500 seconds. The cavity's bottom wall was heated by a heater, and the inner sides of the right and left walls were insulated using fiberglass. The findings from the research indicate that at an operating time of 900 seconds, the maximum air velocities recorded were 0.06, 0.06, 0.03, and 0.10 m/s at the left wall, right wall, bottom, and top of the cavity respectively. Beyond 900 seconds of operation, the air velocities remained constant. Furthermore, at 900 seconds of operation, the maximum isotherms at the regulated temperatures of 323.0 K, 333.0 K, and 343.0 K were approximately equal to their respective temperatures, but they precisely equaled the regulated temperatures at an operating time of 1,500 seconds. The results of this research can be applied to various areas that involve heat and fluid flow, including heat exchangers, building design for energy efficiency, solar systems, nuclear reactor operations, microelectronic component cooling, energy storage, heating devices, and refrigeration systems.

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Natural convection in a trapezoidal enclosure filled with carbon nanotube–EG–water nanofluid

Cited by 127 publications

References 36 publications

An experimental study on thermal conductivity of F-MWCNTs–Fe 3 O 4 /EG hybrid nanofluid: Effects of temperature and concentration

An experimental study on thermal conductivity of F-MWCNTs–Fe 3 O 4 /EG hybrid nanofluid: Effects of temperature and concentration

Numerical investigation of non‐Newtonian nanofluid mixed convection in a two‐opposite direction lid‐driven cavity with variable properties

Numerical Investigation of Temperature and Air Velocity Distribution in a Rectangular Cavity with Insulated Side Walls

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