Lattice Boltzmann method based study of the heat transfer augmentation associated with Cu/water nanofluid in a channel with surface mounted blocks

Mohebbi, Rasul; Lakzayi, Hassan; Sidik, Nor Azwadi Che; Japar, Wan Mohd Arif Aziz

doi:10.1016/j.ijheatmasstransfer.2017.10.043

Cited by 73 publications

(14 citation statements)

References 45 publications

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“…Convergent-divergent riblets, with large-scale induced vortices in the secondary flow, may be applied to augment heat transfer. [38][39][40] In order to investigate the reason behind the presence of the two co-rotating vortices revealed by the streamlines in Fig. 7, a zoom in view of the region near the diverging line is shown in Fig.…”

Section: Large-scale Vortical Structures In the Cross-stream Planementioning

confidence: 99%

Vortical structures and development of laminar flow over convergent-divergent riblets

Zhong

Zhang

2018

Physics of Fluids

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In this work, the development of a laminar boundary layer over a rectangular convergent-divergent riblet section with a finite streamwise length is studied experimentally using dye visualization and particle image velocimetry in a water flume. The flow topology over this highly directional spanwise roughness is established from this study. It is shown that convergent-divergent riblets generate a spanwise flow above the riblets from the diverging line toward the adjacent converging line. This consequently leads to the formation of a weak recirculating secondary flow in cross-stream planes across the boundary layer that creates a downwash motion over the diverging line and an upwash motion over the converging line. It is found that the fluid inside the riblet valley follows a helicoidal path and it also interacts with the crossflow boundary layer hence playing a key role in determining the structure of the secondary flow across the boundary layer. The impact of riblet wavelength on vortical structures is also revealed for the first time. A larger riblet wavelength is seen to produce a stronger upwash/downwash and hence a more intense secondary flow as well as a stronger deceleration effect on the crossflow. Furthermore, the streamwise development of the flow over the riblet section can be divided into a developing stage followed by a developed stage. In the developing stage, the magnitude of induced streamwise velocity and vorticity over the converging line continues to increase, whereas in the developed stage the values of these parameters remain essentially unchanged.

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Section: Large-scale Vortical Structures In the Cross-stream Planementioning

confidence: 99%

Vortical structures and development of laminar flow over convergent-divergent riblets

Zhong

Zhang

2018

Physics of Fluids

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“…all walls: 0 hot walls: 1 cold walls: 0 adiabatic walls: Tables 1 to 3 show the characteristics of different phases. For description the thermophysical properties of nanofluids, the following equations are used (Mohebbi, Lakzayi et al (2018), Mohebbi, Rashidi et al (2018):…”

Section: Fig 1 Schematic Of Problemmentioning

confidence: 99%

Effect of γ-Al2O3/Water Nanofluid on Natural Convection Heat Transfer of Corrugated ┐ Shaped Cavity: Study the Different Aspect Ratio of Grooves

Mohebbi

Khalilabad

2019

JAFM

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In this paper, the effect of γ-Al2O3/water nanofluid on the flow pattern and natural convection heat transfer of corrugated ⅂ shaped cavity is investigated numerically by the Lattice Boltzmann Method (LBM). The effects of nanoparticles solid volume fraction (ϕ=0-0.006), Rayleigh number (Ra=10 3-10 6) and the aspect ratio of grooves cavity (h/H=0.05-0.15) on the streamlines, isotherms and averaged Nusselt number have been examined. In addition, a comparison between γ-Al2O3/water nanofluid and MWCNT-Fe3O4/Water Hybrid Nanofluid on the average Nusselt number are studied. The results showed that the heat transfer rate of γ-Al2O3/water nanofluid is higher than water. For all Rayleigh numbers and solid volume fraction of nanoparticles, increasing the height of grooves leads to an increment in average Nusselt number. Moreover, when the Rayleigh number reaches to 10 6 , the average Nusselt number increases, which the domain mechanism of heat transfer, in this case, becomes convection. As to be expected, the influence of MWCNT-Fe3O4/Water Hybrid Nanofluid on heat transfer rate is higher than the γ-Al2O3/water nanofluid.

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“…The LBM is a flexible and powerful numerical method introduced in the 1980s. It easily responds to complex geometries and is able to perform complicated parallel computations [28][29][30][31][32], making it a powerful tool of fluid simulation for understanding important processes related to heat transfer. Lately, the LBM has been favored over the competing methods for simulating nanofluid heat transfer [33].…”

Section: Introductionmentioning

confidence: 99%

Heat transfer enhancement inside channel by using the Lattice Boltzmann Method

et al. 2021

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In this study, the Lattice Boltzmann Method (LBM) is employed in order to examine the fluid flow and forced convection heat transfer inside a twodimensional horizontal channel with and without obstacles. In order to enhance the heat and thermal energy transfer within the channel, different obstacle arrangements are posed to the flow field and heat transfer with the purpose of studying their sensitivity to these changes. The results indicate that, when the value of the Reynolds number is maximum, the maximum average Nusselt numbers happens on the lower wall (Case 4). The paper extends the topic to the use of nanofluids to introduce a possibility to enhancement of the heat transfer in the channel with an array of the obstacles with forced convection. For this purpose, the AgMgO/water micropolar hybrid nanofluid is used, and the volume fraction of the nanoparticle (50% Ag and 50% MgO by volume) is set between 0 and 0.02. The results showed that, when the hybrid nanofluid is used instead of a typical nanofluid, the rate of the heat transfer inside the channel increases, especially for the high values of the Reynolds number, and the volume fraction of the nanoparticles. Increasing the volume fraction of the nanoparticles increase the local Nusselt number (1.17-fold). It is shown that the type of obstacle arrangement and the specific nanofluid can exerts significant effects on the characteristics of the flow field and heat transfer in the channel. This study provides a platform for using the LBM to examine fluid flow through discrete obstacles in offset positions.

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Lattice Boltzmann method based study of the heat transfer augmentation associated with Cu/water nanofluid in a channel with surface mounted blocks

Cited by 73 publications

References 45 publications

Vortical structures and development of laminar flow over convergent-divergent riblets

Vortical structures and development of laminar flow over convergent-divergent riblets

Effect of γ-Al2O3/Water Nanofluid on Natural Convection Heat Transfer of Corrugated ┐ Shaped Cavity: Study the Different Aspect Ratio of Grooves

Heat transfer enhancement inside channel by using the Lattice Boltzmann Method

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