LBM Analysis of Micro-Convection in MHD Nanofluid Flow

Sunil, Arjun Kozhikkatil; Kumar, Rakesh

doi:10.5545/sv-jme.2016.4248

Cited by 3 publications

(1 citation statement)

References 42 publications

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“…Their results showed a 10% enhancement in Nusselt number for 1% concentration. Sunil and Kumar [12] used the Lattice-Boltzmann scheme to simulate the Al2O3-water nano-fluid.…”

Section: Introductionmentioning

confidence: 99%

The response of nano-ceramic doped fluids in heat convection models: A characteristics-based numerical approach

et al. 2021

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In this paper, forced, free, and mixed convections in incompressible flow were studied numerically. Nano-sized Al2O3, TiO2, MgO, and ZnO ceramics with water were considered as nano-fluids. Simulations were carried out for cavity flow with different boundary conditions and aspect ratios, as well as flow over stationary and rotating cylinders. The mean Nusselt number ( ̅̅̅̅ ) and friction factor for cavity flow and ̅̅̅̅ for flow over a cylinder were compared for different nano-fluids. A new code was developed in FORTRAN 95 for numerical simulations. A fifth-order Runge-Kutta method for time discretization and a characteristicbased scheme for convective terms were used in this code. The averaging scheme on the secondary cells is used to obtain viscous fluxes. Primary results are validated with other researcher's outputs. Results showed that MgO-water and ZnO-water had maximum and minimum heat transfer rates, respectively. Moreover, maximum and minimum shear stresses were recorded for the Al2O3-water and TiO2-water, respectively. Using nano-fluid increases the heat transfer rate between 15 and 37 percent depending on the Richardson number and selected nano-particles.

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“…Their results showed a 10% enhancement in Nusselt number for 1% concentration. Sunil and Kumar [12] used the Lattice-Boltzmann scheme to simulate the Al2O3-water nano-fluid.…”

Section: Introductionmentioning

confidence: 99%

The response of nano-ceramic doped fluids in heat convection models: A characteristics-based numerical approach

et al. 2021

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Study of effect of magnetic field on the axisymmetric vortices produced by a novel vortex generator in a rectangular channel using dynamic mode decomposition

2020

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The introduction of a magnetic field greatly influences the nanofluid flow in a channel. The current study uses a novel vortex generator (VG) to produce a couple of axisymmetric vortices behind the VG at Re = 6000. These vortices are significantly affected by the strength of the magnetic field. The considered cases are identical and vary only with the change in intensity of the magnetic flux. Initially, at Ha = 5, both vortices P1 and P2 are stretched; however, vortex P2 is stretched significantly in comparison to vortex P1. Such stretching enhances the rotational speed of the vortices resulting in the increment of the overall heat transfer rate by 7.1%, when compared to the case with no magnetic flux. With the increase in magnetic flux, the produced vortices are stretched to such an extent that results in the loss of the majority of its span, leading to the decrement in heat transfer rate from the heated base plate to the flowing fluid. For Ha = 50, the heat transfer rate registers a loss of about 45.4%. Finally, the study of the dynamic mode decomposition reveals that the first dominant mode is 10 times higher than the second and third dominant modes.

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Lattice Boltzmann Numerical Investigation of Inner Cylindrical Pin-fins Configuration on Nanofluid Natural Convective Heat Transfer in Porous Enclosure

Jafari

Taeibi-Rahni

Haghshenas

et al. 2018

JAFM

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Concerning the geometrical effect of inner cylindrical hot pins, the natural convective heat transfer of nanofluid in a homogenous porous medium in a squared enclosure is numerically studied, using lattice Boltzmann method (LBM). In order to investigate the arrangement of inner cylinders for better heat transfer performance, five different configurations (including one, three, and four pins) were compared, while the total heat transfer area of inner pins were held fixed. Squared cavity walls and inner cylinder's surfaces were constantly held at cold and warm temperatures, respectively. In our simulation, Brinkman and Forchheimer-extended Darcy models were utilized for isothermal incompressible flow in porous media. The flow and temperature fields were simulated using coupled flow and temperature distribution functions. The effect of porous media was added as a source term in flow distribution functions. The results were validated using previous creditable data, showing relatively good agreements. After brief study of copper nano-particles volume fraction effects, five cases of interest were compared for different values of porosity and Rayleigh number by means of averaged Nusselt number of hot and cold walls; and also local Nusselt number of enclosure walls. Comparison of different cases shows the geometrical dependence of overall heat transfer performance via the average Nusselt number of hot pins strongly depending on their position. The four pin case with diamond arrangement shows the best performance in the light of enclosure walls' average Nusselt number (heat transfer to cold walls). However, the case with three pins and downward triangular arrangement surprisingly gives promising heat transfer performance. In addition, the results show that natural convective heat transfer and flow field is intensified with increasing Rayleigh number, Darcy number, and porosity.

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LBM Analysis of Micro-Convection in MHD Nanofluid Flow

Abstract: The lattice Boltzmann-Bhatnagar-Gross-Krook

Cited by 3 publications

References 42 publications

The response of nano-ceramic doped fluids in heat convection models: A characteristics-based numerical approach

The response of nano-ceramic doped fluids in heat convection models: A characteristics-based numerical approach

Study of effect of magnetic field on the axisymmetric vortices produced by a novel vortex generator in a rectangular channel using dynamic mode decomposition

Lattice Boltzmann Numerical Investigation of Inner Cylindrical Pin-fins Configuration on Nanofluid Natural Convective Heat Transfer in Porous Enclosure

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