Natural convection in a cold enclosure with four hot inner cylinders based on diamond arrays (Part-I: Effect of horizontal and vertical equal distance of inner cylinders)

Mun, Gi Su; Park, Yong Gap; Yoon, Hyun Sik; Kim, Min Soo; Ha, Man Yeong

doi:10.1016/j.ijheatmasstransfer.2017.04.004

Cited by 23 publications

(5 citation statements)

References 31 publications

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“…In the next study, four eccentric hot circular cylinders (T * = 1) inside of a cold square enclosure (T * = 0) in diamond shape with the same radius of R = 0.1L are fixed at (xc 1 = 0.5L, yc 1 = 0.3L), (xc 2 = 0.5L, yc 2 = 0.7L), (xc 3 = 0.3L, yc 3 = 0.5L), and (xc 4 = 0.7L, yc 4 = 0.5L). The isotherms and streamlines are compared and found to be identical with the study of Mun et al 69 in Fig. 4.…”

Section: Numerical Examplessupporting

confidence: 64%

An immersed boundary-lattice Boltzmann method for thermal and thermo-solutal problems of Newtonian and non-Newtonian fluids

Kefayati

2020

Physics of Fluids

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An immersed boundary-lattice Boltzmann method is introduced that can be employed for different thermal and thermo-solutal problems of Newtonian and non-Newtonian fluids. The general macroscopic and mesoscopic equations are presented and discussed. It is shown and proved that the macroscopic equations are satisfied by the proposed lattice Boltzmann equations. This approach removes the limitation of the conventional lattice Boltzmann method in constitutive equations and boundary conditions. To validate the accuracy of the method, it is compared against several cases of complex geometries with curved boundaries for natural convection in enclosures. To demonstrate the ability of this method for the simulation of thermo-solutal flows of non-Newtonian fluids with curved boundaries, double diffusive natural convection of Carreau fluid between a square cylinder and two circular cylinders is investigated and results are reported. Next, double diffusive mixed convection of a Bingham fluid in a cavity with a curved boundary condition is studied.

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Section: Numerical Examplessupporting

confidence: 64%

An immersed boundary-lattice Boltzmann method for thermal and thermo-solutal problems of Newtonian and non-Newtonian fluids

Kefayati

2020

Physics of Fluids

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“…Various researchers examined the effect of the thermal conditions, aspect ratios and the medium of the heat transfer which summarized recently by Das et al, (2017b) The natural convective in a rhombus cavity with an internal cylinder having the shape of circle had been studied numerically by changing both the position of the cylinder as well as the Rayleigh number Choi et al, (2014). Mun et al, (2017) investigated using immersed boundary theory natural convection phenomenon induced by a difference of the temperature resulted in the hot four inner cylinders located inside an enclosure. The simulations presented under various Rayleigh numbers and distances between each cylinder.…”

Section: Frontiers In Heat and Mass Transfermentioning

confidence: 99%

Characteristics of Natural Convection Flow and Heat Transfer of Parallelogramic Enclosure With an Inner Circular Cylinder Using Liquid Nanofluids

Abdulkadhim¹,

Majdi²,

Abed³

2018

Frontiers in Heat and Mass Transfer

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Fluid flow and natural convection heat transfer in a parallelogram enclosure with an inner circular cylinder using Cu-water nanofluid are studied numerically. Dimensionless Navier-Stokes and energy equations are solved numerically using finite element method based two-dimensional flow and steady-state conditions. This study evaluates the effect of different concentrations of Cu-water nanofluids (0% to 6%) with different Rayleigh numbers 10 3 ≤ Ra ≤ 10 6 under isotherm wall temperatures. The effects of geometrical parameters of the parallelogram enclosure (inclination angle in range of 0 ≤ α≤ 30 and location of inner circular cylinder-0.2 ≤ H ≤ +0.2 on the flow field and heat transfer are examined. The results are presented in terms of streamlines, isotherms, local and average Nusselt number. It is found that the inclination angle has a significant effect on flow pattern and heat transfer and the inclination angle of 30 o at a vertical location H=-0.2 gives better fluid flow strength. Moreover, the maximum heat transfer enhancement is obtained when the circular cylinder moves vertically downward up to H=-0.1 and the inclination angle is 30 o. The results also indicate that as the Rayleigh number, nanofluid concentration increase, the rate of heat transfer will increase.

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“…Mun et al [15] analyzed the effects of vertical and horizontal equal distance of internal hot cylinders on natural convection inside a cold enclosure. Bondareva and Sheremet [16] investigated natural convection melting in a square cavity with a local heater.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of hydrothermal features of Cu–H2O nanofluid natural convection within a porous annulus considering diverse configurations of heater

Dogonchi

Nayak

Karimi

et al. 2020

J Therm Anal Calorim

133

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The purpose of the current study is to numerically investigate the effects of shape factors of nanoparticles on natural convection in a fluid saturated porous annulus developed between the elliptical cylinder and square enclosure. A numerical method called the control volume-based finite element method (CVFEM) is implemented for solving the governing equations. The modified flow and thermal structures and corresponding heat transfer features are investigated.Numerical outcomes reveal very good grid independency and excellent agreement with the existing studies. The obtained results convey that at a certain aspect ratio, increment of Rayleigh and Darcy numbers significantly augments the heat transfer and average Nusselt number. Further, enhancement of Rayleigh number increases the velocity of nanofluid while that of aspect ratio of the elliptical cylinder shows the opposite trend.

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Natural convection in a cold enclosure with four hot inner cylinders based on diamond arrays (Part-I: Effect of horizontal and vertical equal distance of inner cylinders)

Cited by 23 publications

References 31 publications

An immersed boundary-lattice Boltzmann method for thermal and thermo-solutal problems of Newtonian and non-Newtonian fluids

An immersed boundary-lattice Boltzmann method for thermal and thermo-solutal problems of Newtonian and non-Newtonian fluids

Characteristics of Natural Convection Flow and Heat Transfer of Parallelogramic Enclosure With an Inner Circular Cylinder Using Liquid Nanofluids

Numerical simulation of hydrothermal features of Cu–H2O nanofluid natural convection within a porous annulus considering diverse configurations of heater

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