Heat transfer and nanofluid flow of free convection in a quarter cylinder channel considering nanoparticle shape effect

Shi, Xiaolong; Jaryani, Pouriya; Amiri, Ali; Rahimi, Alireza; Malekshah, Emad Hasani

doi:10.1016/j.powtec.2018.12.071

Cited by 36 publications

(7 citation statements)

References 45 publications

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“…Later, many researchers worked on nanofluids experimentally and theoretically [2][3][4][5][6][7][8]. Consequently, these investigations lead to greater efforts to enhance the heat transfer rate, yet nobody can conclude and claim that a mixture of a particular type of base fluid with a particular kind of nanoparticle can produce the highest rate of heat transfer [9][10][11][12][13][14]. Continuous attempts have been made to improve the rate of heat transfer using various strategies.…”

Section: Introductionmentioning

confidence: 99%

Dual Solutions and Stability Analysis of Magnetized Hybrid Nanofluid with Joule Heating and Multiple Slip Conditions

et al. 2020

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This paper investigates the steady, two dimensional, and magnetohydrodynamic flow of copper and alumina/water hybrid nanofluid on a permeable exponentially shrinking surface in the presence of Joule heating, velocity slip, and thermal slip parameters. Adopting the model of Tiwari and Das, the mathematical formulation of governing partial differential equations was constructed, which was then transformed into the equivalent system of non-linear ordinary differential equations by employing exponential similarity transformation variables. The resultant system was solved numerically using the BVP4C solver in the MATLAB software. For validation purposes, the obtained numerical results were compared graphically with those in previous studies, and found to be in good agreement, as the critical points are the same up to three decimal points. Based on the numerical results, it was revealed that dual solutions exist within specific ranges of the suction and magnetic parameters. Stability analysis was performed on both solutions in order to determine which solution(s) is/are stable. The analysis indicated that only the first solution is stable. Furthermore, it was also found that the temperature increases in both solutions when the magnetic parameter and Eckert number are increased, while it reduces as the thermal slip parameter rises. Furthermore, the coefficient of skin friction and the heat transfer rate increase for the first solution when the magnetic and the suction parameters are increased. Meanwhile, no change is noticed in the boundary layer separation for the various values of the Eckert number in the heat transfer rate.

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Section: Introductionmentioning

confidence: 99%

Dual Solutions and Stability Analysis of Magnetized Hybrid Nanofluid with Joule Heating and Multiple Slip Conditions

et al. 2020

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“…The nanofluid behaves differently with respect to conventional fluid such as water and oil because of adding nanoparticles to the pure fluid and inter-particle forces. In this regard, to perform the numerical simulations and considering the thermo-physical properties of operating fluid, some modifications should be done, and the effective thermo-physical properties, including effective density ρ nf , the effective thermal expansion β nf , the effective heat capacity ( ρC p ) nf , are required to be defined as follows (Rahimi et al , 2018; Purusothaman and Malekshah, 2019; Shi et al , 2019): …”

Section: Nanofluidmentioning

confidence: 99%

An experimental/numerical hydrothermal analysis on natural convection and TiO₂-SiO₂/W-EG nanofluid’s properties in a hollow/finned cavity

Zaresharif

Zarei

Ranjbar

et al. 2020

HFF

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Purpose This paper aims to provide an experimental/numerical analysis of free convection within a hollow/finned cavity. Design/methodology/approach The hollow square cavity is equipped with eight active fins which have a similar configuration and different temperatures. Furthermore, four different thermal arrangements are considered to determine the order of temperature for each fin. The coupled lattice Boltzmann method is used, which not only maintains the considerable advantages of standard lattice Boltzmann method such as accuracy but also enhances the stability of this method. Findings The cavity is filled with TiO2-SiO2/Water-Ethylene Glycol nanofluid. The thermal conductivity and dynamic viscosity of nanofluid are experimentally measured using high-precision devices in six concentrations of the nanoparticle. In this study, some main parameters, including a range of Rayleigh number (103 < Ra < 106), the concentration of nanofluid (0.5 to 3 Vol.%) and thermal arrangements of fins, are considered. The effects of these main parameters on the flow, isotherms, heat transfer performance and entropy generation are studied. Originality/value The originality of this paper is combining the numerical simulation (lattice Boltzmann method) using a modern approach with experimental observations of nanofluid’s properties.

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“…Applying nanoparticles in the base fluid contributes to the heat and mass transfer enhancement in two ways, the one contribution is due to the Brownian movement of nanoparticles which transports heat (diffusion of nanoparticles), and the other contribution is due to an improvement in fluid thermal features [6]. Wong and Castillo [7] analyzed the impact of nanofluids in heat transfer through various experimental models, and theories regarding the heat transfer mechanism.…”

Section: Introductionmentioning

confidence: 99%

Lattice Boltzmann simulation of magneto-hydrodynamic double-diffusive natural convection in an enclosure with internal heat and solute source using nanofluids

2020

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Magneto-hydrodynamic double-diffusive natural convection in a cavity is numerically investigated in the present work. Al 2 O 3 , Cu, and Ag based nanofluids in a square cavity with a thermal and solute source in the center, and uniform magnetic field are considered. The Patel model is employed to estimate the thermal conductivity of applied nanofluids, and the numerical calculation is based on the implementation of the lattice Boltzmann method and utilizing the standard D 2 Q 9 model to study the heat transfer, and also species concentration. A parametric study is carried out to observe the influence of the type, the volume fraction of nanoparticle ( = 0 − 5% ), Rayleigh ( Ra = 10 4 − 10 5 − 10 6 ) , Lewis (0.1 − 2 − 10) , and Hartmann number (10 − 20 − 100) on average Nusselt and Sherwood numbers, flow fields, temperature, and concentration distribution. The results show that an augment in nanoparticle volume fraction and Rayleigh number increased the average Nusselt and Sherwood numbers. Lewis number showed a significant impact on mass transfer rate. However, it did not affect the heat transfer rate remarkably. Applying a magnetic field caused a reduction in flow circulation which resulted in a decline in heat and mass transfer. A comparison of the simulation outcome with the available data shows that the generated code perfectly captures the fluid flow behavior and heat transfer process as a function of the affecting parameters. KeywordsMHD double-diffusive natural convection • Square enclosure • Nanofluids • Lattice Boltzmann method List of symbols Ar Aspect ratio B The magnitude of the magnetic field, T c Lattice speed, m∕s c i Discrete particle speed, m∕s c s Sound velocity, m∕s C Concentration C p Specific heat, Jkg −1 K D Mass diffusivity, m 2 ∕s f , g, h Discrete distribution function F External force

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Heat transfer and nanofluid flow of free convection in a quarter cylinder channel considering nanoparticle shape effect

Cited by 36 publications

References 45 publications

Dual Solutions and Stability Analysis of Magnetized Hybrid Nanofluid with Joule Heating and Multiple Slip Conditions

Dual Solutions and Stability Analysis of Magnetized Hybrid Nanofluid with Joule Heating and Multiple Slip Conditions

An experimental/numerical hydrothermal analysis on natural convection and TiO₂-SiO₂/W-EG nanofluid’s properties in a hollow/finned cavity

Lattice Boltzmann simulation of magneto-hydrodynamic double-diffusive natural convection in an enclosure with internal heat and solute source using nanofluids

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Heat transfer and nanofluid flow of free convection in a quarter cylinder channel considering nanoparticle shape effect

Cited by 36 publications

References 45 publications

Dual Solutions and Stability Analysis of Magnetized Hybrid Nanofluid with Joule Heating and Multiple Slip Conditions

Dual Solutions and Stability Analysis of Magnetized Hybrid Nanofluid with Joule Heating and Multiple Slip Conditions

An experimental/numerical hydrothermal analysis on natural convection and TiO2-SiO2/W-EG nanofluid’s properties in a hollow/finned cavity

Lattice Boltzmann simulation of magneto-hydrodynamic double-diffusive natural convection in an enclosure with internal heat and solute source using nanofluids

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An experimental/numerical hydrothermal analysis on natural convection and TiO₂-SiO₂/W-EG nanofluid’s properties in a hollow/finned cavity