Magnetohydrodynamic Nanofluid Natural Convection in a Cavity under Thermal Radiation and Shape Factor of Nanoparticles Impacts: A Numerical Study Using CVFEM

Chamkha, Ali J.; Dogonchi, A.S.; Ganji, D.D.

doi:10.3390/app8122396

Cited by 190 publications

(32 citation statements)

References 38 publications

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“…Chamkha and Dogonchi [84] numerically examined the natural convection of a magnetohydrodynamic nanofluid in an enclosure subject to the effects of thermal radiation and the shape factor of nanoparticles using the control-volume-based finite element method (CVFEM). The investigation of nanofluid heat transfer and flow was conducted using an extensive range of Rayleigh numbers, radiation parameters, nanofluid volume fractions, Hartmann numbers, and nanoparticle shape factors.…”

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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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

Self Cite

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“…One can assess the past and recent advancements subject to both the Newtonian and non-Newtonian fluid models in Refs. [18][19][20][21][22][23][24][25][26][27][28][29][30]. In this attempt, the analysis is limited to one of the non-Newtonian fluids known as Power law or Ostwald-de Waele equation.…”

Section: Literature Assessmentmentioning

confidence: 99%

A potential alternative CFD simulation for steady Carreau–Bird law-based shear thickening model: Part-I

Rehman

Malik

Mahmood

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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The current article provides the numerical investigation into an infinite-length circular cylinder placed as an obstacle in the flow of non-Newtonian fluid. To be more specific, a channel of length 2.2 m and height 0.41 m is considered. The Power law fluid model is carried out with Carreau-Bird law as a non-Newtonian fluid model, and both the Power law linear (constant) and parabolic velocity profiles are initiated simultaneously at an inlet of the channel. The right wall as an outlet is carried with Neumann condition. The relative velocity of Power law fluid particles with both the lower and upper walls is taken zero. A mathematical model is structured in terms of nonlinear differential equations. A well-trusted numerical technique named finite element method is adopted commercially. The LBB-stable element pair is utilized to approximate the velocity and pressure. The nonlinear iterations are stopped when the residual is dropped by 10 −6. The impact of Power law index and Reynolds number on the primitive variables is inspected. The obtained observations in this direction are provided by means of both the contour plots and line graphs. Due to a circular obstacle, both the drag and lift coefficients are evaluated around the outer surface of an obstacle towards the higher values of the Power law index. The numerical values of drag and lift coefficients up to various refinement mesh levels of domain are provided by way of tables. It is noticed that the parabolic velocity profile at an inlet of channel is compatible as compared to the linear velocity profile. Further, both the drag and lift coefficients are increasing function of Power law index. Keywords Power law fluid model • Linear and parabolic profiles • Finite element method • Drag and lift coefficients List of symbols (x, y, z) Space variables ⃗ V = (u, v, w) Velocity field Fluid density p Pressure ↔ Stress tensor ⃗ B Body force Fluid viscosity Apparent viscosity n Power law index K Consistency coefficient U mean Mean velocity D Characteristic length (diameter of circular cylinder) Re Reynolds number U max Maximum velocity F D Drag force F L Lift force C D Drag coefficient C L Lift coefficient

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“…When the molar fraction of helium was higher than 35%, it would cause stratification of noncondensable gas in the steam [10]. It is well known that there are many factors affecting the steam condensation heat transfer by noncondensable gas, including the type and concentration of noncondensable gases [11][12][13][14][15], the degree of supercooling of condensing surface [16,17], the inclination of condensing surface [18], and the flow rate of mixed gas [19], that is, with the increase of the concentration of noncondensable gas, the steam condensation heat transfer coefficient will decrease significantly. Different kinds of noncondensable gases have different effects on steam condensation heat transfer.…”

Section: Introductionmentioning

confidence: 99%

The Investigation on Heat Transfer Characteristics of Steam Condensation in Presence of Noncondensable Gas under Natural Convection

Heng

et al. 2021

Science and Technology of Nuclear Installations

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The NHR-200 reactor in China adopts the noncondensable gas self-stabilizing control and the noncondensable gas used for pressure stabilization control can weaken steam condensation heat transfer in the integrated steam-gas pressurizer. A condensation experimental system was established and the heat transfer characteristics of steam-nitrogen and steam-argon condensation under natural convection had been investigated. The pressure ranged from 0.516 to 5.10 MPa. The distributions of nitrogen and argon in the steam/gas mixture were obtained in the experiments, and the results showed that nitrogen and argon were evenly distributed in the steam under different pressure, respectively. The effects of heat transfer temperature difference had also been investigated and it is found that the total heat transfer coefficient difference had little influence on the total condensation heat transfer coefficient. However, the steam condensation heat transfer coefficient decreased with the increase of the degree of supercooling of the wall. The condensation heat transfer coefficient was reduced by approximately 0.11 kW/(m2·K) as the degree of supercooling of the wall changed from 14°C to 36°C. The condensation heat transfer coefficient also decreased with the mass/molar fraction of noncondensable gas increasing and a certain difference between the effect of the mass fraction of noncondensable gas and the effect of the molar fraction of noncondensable gas was discussed in this paper.

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Magnetohydrodynamic Nanofluid Natural Convection in a Cavity under Thermal Radiation and Shape Factor of Nanoparticles Impacts: A Numerical Study Using CVFEM

Cited by 190 publications

References 38 publications

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

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

A potential alternative CFD simulation for steady Carreau–Bird law-based shear thickening model: Part-I

The Investigation on Heat Transfer Characteristics of Steam Condensation in Presence of Noncondensable Gas under Natural Convection

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