Finite element analysis of double-diffusive natural convection in a porous triangular enclosure filled with Al2O3-water nanofluid in presence of heat generation

Chowdhury, Raju; Parvin, Salma; Khan, Md. Abdul Hakim

doi:10.1016/j.heliyon.2016.e00140

“…Another strategy for enhancing heat transfer is the utilization of the geometric shapes of cavities. In the past few decades, many studies are presented on natural or mixed convection in cavities of different shapes, such as rectangular or square (Abdelraheem, 2019; Aly, 2020a), triangular (Balotaki et al , 2020), trapezoidal (Abed et al , 2019; Wubshet and Hirpho, 2021), circular (Aly Abdelraheem, 2020c; Chamkha et al , 2010; Chowdhury et al , 2016; Raizah and Aly, 2021), circular with inner complex shape (Rostami et al , 2020), C-shaped (Mansour et al , 2019), V-shaped (Raizah et al , 2021), L-shaped (Bhopalam and Arumuga Perumal, 2020; Ahmed et al , 2019), T-shaped (Kasaeipoor et al , 2015), H-shaped (Aly, 2020b) and hexagonal shaped cavities (Montuori et al , 2015). Montuori et al (2015) provided a study on tall buildings by hexagonal tube configurations.…”

Section: Introductionmentioning

confidence: 99%

A rotating superellipse inside a hexagonalshaped cavity suspended by nano-encapsulated phase change materials based on the ISPH method

Raizah

¹

,

Aly

²

2021

HFF

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Purpose The purpose of this paper is to perform numerical simulations based on the incompressible smoothed particle hydrodynamics (ISPH) method for thermo-diffusion convection in a hexagonal-shaped cavity saturated by a porous medium and suspended by a nano-encapsulated phase change material (NEPCM). Here, the solid particles are inserted into a phase change material to enhance its thermal performance. Design/methodology/approach Superellipse rotated shapes with variable lengths are embedded inside a hexagonal-shaped cavity. These inner shapes are rotated around their center by a uniform circular velocity and their conditions are positioned at high temperature and concentration. The controlling equations in a non-dimensional form were analyzed by using the ISPH method. At first, the validation of the ISPH results is performed. Afterward, the implications of a fusion temperature, lengths/types of the superellipse shapes, nanoparticles parameter and time parameter on the phase change heat transfer, isotherms, isoconcentration and streamlines were addressed. Findings The achieved simulations indicated that the excess in the length of an inner superellipse shape augments the temperature, concentration and maximum of the streamlines in a hexagonal-shaped cavity. The largest values of mean Nusselt number are attained at the inner rhombus shape with convex (n = 1.5) and the largest values of mean Sherwood number are attained at the inner rectangle shape with rounded corners (n = 4). Originality/value The ISPH method is developed to emulate the influences of the uniform rotation of the novel geometry shapes on heat/mass transport inside a hexagonal-shaped cavity suspended by NEPCM and saturated by porous media.

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“…Mohebbi and Rashidi [21] used the Lattice Boltzmann Method (LBM) to study numerically the natural convection flow of nanofluid in L−shaped enclosure containing a heating obstacle. Chowdhury et al [22] studied the double-diffusive convection in an enclosure filled by porous media and nanofluid with considering heat generation effects. e ISPH method was adopted by Aly and Raizah [23] to simulate double-diffusive convection in an enclosure filled with a nanofluid.…”

Section: Introductionmentioning

confidence: 99%

Double-Diffusive of a Nanofluid in a Rectangle-Shape Mounted on a Cavity Saturated by Heterogeneous Porous Media

Aly

¹

,

Mahmoud

²

,

Ahmad

³

et al. 2021

Journal of Mathematics

2

0

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This study presents numerical simulations on double-diffusive flow of a nanofluid in two cavities connected with four vertical gates. Novel shape of an outer square shape mounted on a square cavity by four gates was used. Heterogeneous porous media and Al 2 O 3 -water nanofluid are filled in an inner cavity. Outer rectangle shape is filled with a nanofluid only, and its left walls carry high temperature T h and high concentration C h . The right walls of a rectangle shape carry low temperature T c and low concentration C c and the other walls are adiabatic. An incompressible smoothed particle hydrodynamics (ISPH) method is applied for solving the governing equations of velocities, temperature, and concentration. Results are introduced for the effects of a buoyancy ratio − 2 ≤ N ≤ 2 , Darcy parameter 10 − 3 ≤ Da ≤ 10 − 5 , solid volume fraction 0 ≤ ϕ ≤ 0.05 , and porous levels. Main results are indicated in which the buoyancy ratio parameter adjusts the directions of double-diffusive convection flow in an outer shape and inner cavity. Adding more concentration of nanoparticles reduces the flow speed and maximum of the velocity field. Due to the presence of a porous medium layer in an inner cavity, the Darcy parameter has slight changes inside the rectangle shape.

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“…Chamkha and Al-Mudhaf [11] studied thermosolutal convection in a titled porous cavity. The influences of heat generation on thermosolutal convection within a nanofluid-filled triangular enclosure saturated by porous media were introduced by Chowdhury et al [12]. Aly and Raizah [13] have approved the ISPH method for the transmission of heat & mass in a nanofluid-occupied enclosure.…”

Section: Introductionmentioning

confidence: 99%

Double‐diffusive convection in a porous complex‐shaped cavity suspended by nano‐encapsulated phase change materials

Aly

¹

,

Alsedais

²

2021

Z Angew Math Mech

4

0

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This paper simulates a double-diffusive convection of suspended nanoencapsulated phase change materials (NEPCM) embedded inside a porous complex-shaped cavity. The ISPH method is employed to handle the controlling equations in dimensionless form. The complex-shaped cavity consists of a circular cylinder mounted vertically on two rectangle shapes. Variable-length on the left wall is maintained at a temperature and concentration higher than the on the other side of the wall. Phase changes in encapsulated nanoparticles were assessed by the heat capacity of the core and shell layers. The simulations carried out were shown in terms of the velocity field, temperature, concentration, and melting-solidification zones below the effects of the variable hot source 𝐿 ℎ (0.4 ≤ 𝐿 ℎ ≤ 2), the fusion temperature 𝜃 𝑓 (0.05 ≤ 𝜃 𝑓 ≤ 0.95) and the Stefan parameter 𝑆𝑡𝑒 (0.2 ≤ 𝑆𝑡𝑒 ≤ 0.9). The main finding indicated that the phase change zone follows the hot source within the cavity. The expansions of the partial hot length and the fusion temperature alter the intensity and location of the phase change zone. An augmentation in the Stefan number lowers the intensity of the phase change zone.

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Finite element analysis of double-diffusive natural convection in a porous triangular enclosure filled with Al2O3-water nanofluid in presence of heat generation

Cited by 23 publications

References 23 publications

A rotating superellipse inside a hexagonalshaped cavity suspended by nano-encapsulated phase change materials based on the ISPH method

A rotating superellipse inside a hexagonalshaped cavity suspended by nano-encapsulated phase change materials based on the ISPH method

Double-Diffusive of a Nanofluid in a Rectangle-Shape Mounted on a Cavity Saturated by Heterogeneous Porous Media

Double‐diffusive convection in a porous complex‐shaped cavity suspended by nano‐encapsulated phase change materials

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