Lattice Boltzmann method for nanofluid flow and heat transfer in a curve-ended T-shaped heat exchanger

Rahimi, Alireza; Bakhshi, Hesam; Saee, Ali Dehghan; Kasaeipoor, Abbas; Malekshah, Emad Hasani

doi:10.1108/hff-05-2018-0249

Cited by 20 publications

(13 citation statements)

References 51 publications

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“…Table I. The thermo-physical properties of CuOwater nanofluid (Rahimi et al, 2018c) (Rahimi et al, 2019a(Rahimi et al, , 2019b Nanofluid flow and heat transfer…”

Section: Entropy Generation Formulationmentioning

confidence: 99%

Nanofluid flow and heat transfer due to natural convection in a semi-circle/ellipse annulus using modified lattice Boltzmann method

Xiong

Khosravi

Nabipour³

et al. 2019

HFF

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Purpose This paper aims to numerically investigate the nanofluid flow, heat transfer and entropy generation during natural convection in an annulus. Design/methodology/approach The lattice Boltzmann method is used to simulate the velocity and temperature fields. Furthermore, some special modifications are applied to make the lattice Boltzmann method capable for simulation in the curved boundary conditions. The annulus is filled with CuO-water nanofluid. The dynamic viscosity of nanofluid is estimated using KLL (Koo-Kleinstreuer-Li) model, and the nanoparticle shape effect is taken account in calculating the thermal conductivity. On the other hand, the local/volumetric entropy generation is used to show the irreversibility under influence of different parameters. Findings The effect of considered governing parameters including Rayleigh number (103<Ra < 106); nanoparticle concentration (0<<0.04) and configuration of annulus on the flow structure; temperature field; and local and total entropy generation and heat transfer rate are presented. Originality/value The originality of this work is using of lattice Boltzmann method is simulation of natural convection in a curved configuration and using of Koo–Kleinstreuer–Li correlation for simulation of nanofluid.

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“…Table I. The thermo-physical properties of CuOwater nanofluid (Rahimi et al, 2018c) (Rahimi et al, 2019a(Rahimi et al, , 2019b Nanofluid flow and heat transfer…”

Section: Entropy Generation Formulationmentioning

confidence: 99%

Nanofluid flow and heat transfer due to natural convection in a semi-circle/ellipse annulus using modified lattice Boltzmann method

Xiong

Khosravi

Nabipour³

et al. 2019

HFF

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“…This reduction is much higher for hybrid nanofluid compared to the single nanofluid. Rahimi et al (2019b) analyzed numerically the nanofluid flow and heat transfer in a curve-ended T-shaped heat exchanger. The lattice Boltzmann method (LBM) is used to simulate the natural convection fluid flow and heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Appraising conjugate heat transfer, heatlines visualization and entropy generation of Ag-MgO/H₂O hybrid nanofluid in a partitioned medium

Ferhi

Djebali

2020

HFF

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Purpose This paper aims to perform the lattice Boltzmann simulation of conjugate natural convection heat transfer, heat flow visualization via heatlines approach and entropy generation in a partitioned medium filled with Ag-MgO (15-85%)/water. Design/methodology/approach The lattice Boltzmann method (LBM) is used to predict the dynamic and thermal behaviors. Experimental correlations for dynamic viscosity and thermal conductivity versus solid volume fraction are used. The study is conducted for the ranges of Rayleigh number 103 ≤ Ra ≤ 106, the partitioner thickness 0.01 ≤ δ ≤ 0.9, its position 0.15 ≤ Xs ≤ 0.85 and the hybrid nano-suspensions volume fraction 0% ≤ ϕ ≤ 2%. Findings The effects of varying of controlling parameters on the convective flow patterns, temperature contours, heat transfers, the heatlines and the entropy generation are presented. It has been found that the maximum rate of heat transfer enhancement occurs for low Ra numbers (103) and is close to 13.52%. The solid thickness d and its horizontal position Xs have a substantial influence on the heat transfer rate, flow structure, heatline, total entropy generation and Bejan number. Besides, the maximum heat transfer is detected for high Ra and δ ≈ 1 and the percentage of augmentation is equal to 65.55% for ϕ = 2%. According to the horizontal position, the heat transfer remains invariant for Ra = 103 and takes a maximum value near the active walls for Ra ≥ 104. The total entropy generation increases with Ra and decreases with ϕ for Ra = 106. The increase of ϕ from 0 to 2% leads to a reduction in close to 40.76%. For this value of Ra, the entropy is the maximum for δ = 0.4 and Xs = 0.35 and Xs = 0.65%. Moreover, as the Ra increases the Bejan number undergoes a decrease. The Bejan number is the maximum for Ra = 103 independently to δ and Xs. The superior thermal performance manifests at low Ra and high value of δ independently to the positions of the conducting body. Originality/value The originality of this paper is to analyze the hybrid nano-additive effects on the two-dimensional conjugate natural convection in a partitioned medium using the LBM. The experimental correlations used for the effective thermal conductivity and dynamic viscosity give credibility to our study. Different approaches such as heatlines and entropy generation are used.

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“…Due to the fact that the convective flow and heat transfer are existed in many thermal devices, which have temperature difference in presence of gravity acceleration, the Analysis of a finned/tubular heat exchanger researchers are attracted to study the natural convection in all possible aspects. Some of the applications, which the natural convection can be found there, are solar collector, heat exchanger, HVAC, cooling of electronic devices, conjugate heat transfer and so on (Rahimi et al, 2018b;Rahimi et al,2019a;Rahimi et al, 2018a;Rahimi et al, 2019c;Rahimi et al, 2019b).…”

Section: Introductionmentioning

confidence: 99%

An experimental/numerical hydrothermal-Second law analysis of a finned/tubular heat exchanger using Bhatnagar–Gross–Krook Lattice Boltzmann (BGKLBM) and rheological-thermal behavior of Fe₂O₃-water

Hejri¹,

Kamali

Malekshah

2020

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Purpose The purpose of this study is analysis of the natural convection and entropy production in a two-dimensional section of the considered heat exchanger. For this purpose, the lattice Boltzmann method which is equipped with Bhatnagar–Gross–Krook model is used. This model proposes a significant accurate prediction for thermal and hydro-dynamical behaviors over free convection phenomenon. The heat exchanger is filled with Fe2O3-water nanofluid. To improve the accuracy of prediction, it is neglected to use the theoretical models for properties of nanofluid. At this end, some experimental observations are conducted, and the required rheological and thermal properties of nanofluid are measured based on laboratory work.. Design/methodology/approach The present work focuses on the influence of different factors on the thermal behaviors and entropy production of a heat exchanger. The heat exchanger is consisted by an inner tube, an outer tube and some fins which are implanted at the surface of inner tube. Findings The effects of various factors like structure of inner fins, nanoparticle concentration and Rayleigh number over the heat transfer rate, local and volumetric entropy production, Bejan number, flow configuration and temperature distributions are provided. Originality/value The originality of this work is using a new-developed numerical method for treating natural convection and experimental measurements for thermal and rheological properties of nanofluid.

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Lattice Boltzmann method for nanofluid flow and heat transfer in a curve-ended T-shaped heat exchanger

Cited by 20 publications

References 51 publications

Nanofluid flow and heat transfer due to natural convection in a semi-circle/ellipse annulus using modified lattice Boltzmann method

Nanofluid flow and heat transfer due to natural convection in a semi-circle/ellipse annulus using modified lattice Boltzmann method

Appraising conjugate heat transfer, heatlines visualization and entropy generation of Ag-MgO/H₂O hybrid nanofluid in a partitioned medium

An experimental/numerical hydrothermal-Second law analysis of a finned/tubular heat exchanger using Bhatnagar–Gross–Krook Lattice Boltzmann (BGKLBM) and rheological-thermal behavior of Fe₂O₃-water

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Lattice Boltzmann method for nanofluid flow and heat transfer in a curve-ended T-shaped heat exchanger

Cited by 20 publications

References 51 publications

Nanofluid flow and heat transfer due to natural convection in a semi-circle/ellipse annulus using modified lattice Boltzmann method

Nanofluid flow and heat transfer due to natural convection in a semi-circle/ellipse annulus using modified lattice Boltzmann method

Appraising conjugate heat transfer, heatlines visualization and entropy generation of Ag-MgO/H2O hybrid nanofluid in a partitioned medium

An experimental/numerical hydrothermal-Second law analysis of a finned/tubular heat exchanger using Bhatnagar–Gross–Krook Lattice Boltzmann (BGKLBM) and rheological-thermal behavior of Fe2O3-water

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Appraising conjugate heat transfer, heatlines visualization and entropy generation of Ag-MgO/H₂O hybrid nanofluid in a partitioned medium

An experimental/numerical hydrothermal-Second law analysis of a finned/tubular heat exchanger using Bhatnagar–Gross–Krook Lattice Boltzmann (BGKLBM) and rheological-thermal behavior of Fe₂O₃-water