Simulations of natural convection heat transfer in an enclosure at different Rayleigh number using lattice Boltzmann method

Wei, Yikun; Wang, Zhengdao; Yue, Qian; Yan, Weiwei

doi:10.1016/j.compfluid.2015.09.004

Cited by 59 publications

(35 citation statements)

References 14 publications

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“…All the numerical simulations have been implemented using a lattice Boltzmann scheme. Previous studies of the lattice Boltzmann method had emphasized potential advantages in a variety of single, multiphase and thermal fluid hydrodynamic problems [23][24][25][26][27][28][29]. Governing equations and numerical methods will be briefly described first in the following section.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study on Entropy Generation in Two-Dimensional Rayleigh-Bénard Convection at Different Prandtl Number

Wei

Wang

Yue

2017

Entropy

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Entropy generation in two-dimensional Rayleigh-Bénard convection at different Prandtl number (Pr) are investigated in the present paper by using the lattice Boltzmann Method. The major concern of the present paper is to explore the effects of Pr on the detailed information of local distributions of entropy generation in virtue of frictional and heat transfer irreversibility and the overall entropy generation in the whole flow field. The results of this work indicate that the significant viscous entropy generation rates (Su) gradually expand to bulk contributions of cavity with the increase of Pr, thermal entropy generation rates (S θ ) and total entropy generation rates (S) mainly concentrate in the steepest temperature gradient, the entropy generation in the flow is dominated by heat transfer irreversibility and for the same Rayleigh number, the amplitudes of Su, S θ and S decrease with increasing Pr. It is found that that the amplitudes of the horizontally averaged viscous entropy generation rates, thermal entropy generation rates and total entropy generation rates decrease with increasing Pr. The probability density functions of Su, S θ and S also indicate that a much thinner tail while the tails for large entropy generation values seem to fit the log-normal curve well with increasing Pr. The distribution and the departure from log-normality become robust with decreasing Pr.

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Section: Introductionmentioning

confidence: 99%

A Numerical Study on Entropy Generation in Two-Dimensional Rayleigh-Bénard Convection at Different Prandtl Number

Wei

Wang

Yue

2017

Entropy

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“…Through steady and unsteady simulations of the centrifugal fan based on computational fluid dynamics (CFD), the internal flow field of the centrifugal fan has attracted a large number of researchers [32][33][34][35][36][37][38][39][40][41][42]. The discrete format at steady calculations is SIMPLE; SIMPLE is also adopted at the unsteady simulations, and the second-order format is carried out in the steady and unsteady simulations.…”

Section: Numerical Verificationmentioning

confidence: 99%

Unsteady Characteristics of Forward Multi-Wing Centrifugal Fan at Low Flow Rate

Lun

Ye²,

Lin³

et al. 2019

Processes

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The unsteady flow characteristics of a forward multi-wing centrifugal fan under a low flow rate are studied using the computational fluid dynamics (CFD) method. This paper emphasizes the eddy current distribution in terms of the Q criterion method, as well as pressure fluctuation, frequency spectrum, and kinetic energy spectrum analysis of internal monitoring points in a forward multi-wing centrifugal fan. The numerical results show that abnormal eddies mainly appear at the volute outlet and near the volute tongue, boundary layer separation occurs near the suction surface of the blade, and shedding eddies appear at the trailing edge of the blade with the time evolution. The unsteady flow characteristics of a forward multi-wing centrifugal fan at a small flow rate provide significant physical insight into understanding the internal flow law.

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“…Accordingly, natural convection within rectangular/square cavities filled with nanofluids in 2D form was investigated by many researchers [4,5]. There are large number of investigations which have considered natural convection in enclosures filled with single type of fluid, Hu et al [6] and kefayati [7].Wei et al [8] investigated the natural convection within a square cavity with different Rayleigh number. They applied Lattice Boltzmann method and the results show the natural convection mechanism with increasing of Rayleigh number.…”

Section: Introductionmentioning

confidence: 99%

Three dimensional simulation of natural convection and entropy generation in an air and MWCNT/water nanofluid filled cuboid as two immiscible fluids with emphasis on the nanofluid height ratio's effects

Salari

Malekshah

Esfe

2017

Journal of Molecular Liquids

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Simulations of natural convection heat transfer in an enclosure at different Rayleigh number using lattice Boltzmann method

Cited by 59 publications

References 14 publications

A Numerical Study on Entropy Generation in Two-Dimensional Rayleigh-Bénard Convection at Different Prandtl Number

A Numerical Study on Entropy Generation in Two-Dimensional Rayleigh-Bénard Convection at Different Prandtl Number

Unsteady Characteristics of Forward Multi-Wing Centrifugal Fan at Low Flow Rate

Three dimensional simulation of natural convection and entropy generation in an air and MWCNT/water nanofluid filled cuboid as two immiscible fluids with emphasis on the nanofluid height ratio's effects

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