Simulation of water/FMWCNT nanofluid forced convection in a microchannel filled with porous material under slip velocity and temperature jump boundary conditions

Gholamalizadeh, Ehsan; Pahlevanzadeh, Farzad; Ghani, Kamal; Karimipour, Arash; Nguyen, Truong Khang; Safaei, Mohammad Reza

doi:10.1108/hff-01-2019-0030

Cited by 55 publications

(24 citation statements)

References 30 publications

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“…The numerical code developed and validated in the present investigation can further be extended to a 3-D configuration for a more pragmatic modeling of the heat transfer in the biomass pyrolysis pilot plant. Another possible perspective of the present work is to use the present code for the study of radiating nanoparticles in the flow of nanofluids by coupling the work like [29][30][31][32][33] and the present code.…”

Section: Discussionmentioning

confidence: 99%

Radiation Heat Transfer in a Complex Geometry Containing Anisotropically-Scattering Mie Particles

Ettaleb

Abbassi

Farhat³

et al. 2019

Energies

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This study aims to numerically investigate the radiation heat transfer in a complex, 3-D biomass pyrolysis reactor which is consisted of two pyrolysis chambers and a heat recuperator. The medium assumes to be gray, absorbs, emits, and Mie-anisotropically scatters the radiation energy. The finite volume method (FVM) is applied to solve the radiation transfer equation (RTE) using the step scheme. To treat the complex geometry, the blocked-off-region procedure is employed. Mie equations (ME) are applied to evaluate the scattering phase function and analyze the angular distribution of the anisotropically scattered radiation by particles. In this study, three different states are considered to test the anisotropic scattering impacts on the temperature and radiation heat flux distribution. These states are as: (i) Isotropic scattering, (ii) forward and backward scattering and (iii) scattering with solid particles of different coals and fly ash. The outcomes demonstrate that the radiation heat flux enhances by an increment of the albedo and absorption coefficients for the coals and fly ash, unlike the isotropic case and the forward and backward scattering functions. Moreover, the particle size parameter does not have an important influence on the radiation heat flux, when the medium is thin optical. Its effect is more noticeable for higher extinction coefficients.

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Section: Discussionmentioning

confidence: 99%

Radiation Heat Transfer in a Complex Geometry Containing Anisotropically-Scattering Mie Particles

Ettaleb

Abbassi

Farhat³

et al. 2019

Energies

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“…Porous media were used not only as burners but also heat transfer enhancement [42][43][44][45]. Furthermore, porous burners have been used to burn low grade fuel that have low-calorific value.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of combustion of low-calorific producer gas from small scale biomass gasification within porous burner

Jirakulsomchok¹,

Wongchang²,

Prasartthong³

2021

Journal of Thermal Engineering

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The aim of this experimental study is to investigate the combustion low-calorific producer gas within porous burner. The small scale downdraft biomass gasification for rural area was performed to produce gaseous fuel. Three types of wood in Thailand were used as raw materials to produce producer gas, i.e. Acacia-mangium, White popinac and Eucalyptus. The low heating values of producer gas were in the range of 3800-4232 kJ.kg -1 that are difficult to burn in conventional burner. Tapered and bilayer porous burners were used to overcome this limitation. The effects of air preheating modes, equivalence ratio and firing rate on thermal structure and pollutant emission were revealed. The results showed that the complete combustion with low emission of low-calorific producer gas was accomplished with low firing rate in the range of 2.8 -3 kW. Both CO and NO x emission were less than 160 ppm for all of tests. The combustion within tapered porous burner emitted small CO emission nearly zero for all of equivalence ratios. The tar reduction was 99.5% by combustion within porous burner.

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“…Gholamalizadeh et al [25] performed a two-dimensional numerical study of a convective flow in a nanofluid water/ FMWCNT-coated microchannel. The slip velocity boundary condition was applied for the solid walls.…”

Section: Introductionmentioning

confidence: 99%

Heat and mass transfer and thermodynamic analysis of power-law fluid flow in a porous microchannel

Sarafan

Alizadeh

Fattahi

et al. 2020

J Therm Anal Calorim

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Transfer of heat and mass and thermodynamic irreversibilities are investigated in a porous, parallel-plate microreactor in which the working fluid is non-Newtonian. The investigated microreactor features thick flat walls with uneven thicknesses, which can be subject to different thermal loads. The dimensionless governing equations of the resultant asymmetric problem are first derived theoretically and then solved numerically by using a finite volume technique. This results in two-dimensional solutions for the velocity, temperature and concentration fields as well as the distributions of Nusselt number and local and total entropy generations. The results clearly demonstrate the significance of the numerical value of the power-law index and departure from Newtonian behavior of the fluid. In particular, it is shown that by increasing the value of power-law index the Nusselt number on the wall decreases. This leads to the intensification of the temperature gradients in the system and therefore magnifies the local and total entropy generations. Also, it is shown that the wall thickness and thermal asymmetry can majorly affect the heat transfer process and thermodynamic irreversibility of the microreactor. It is noted that the current work is the first comprehensive study of heat transfer and entropy generation in porous micro-chemical reactor with non-Newtonian, power-law fluid.

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Simulation of water/FMWCNT nanofluid forced convection in a microchannel filled with porous material under slip velocity and temperature jump boundary conditions

Cited by 55 publications

References 30 publications

Radiation Heat Transfer in a Complex Geometry Containing Anisotropically-Scattering Mie Particles

Radiation Heat Transfer in a Complex Geometry Containing Anisotropically-Scattering Mie Particles

Experimental study of combustion of low-calorific producer gas from small scale biomass gasification within porous burner

Heat and mass transfer and thermodynamic analysis of power-law fluid flow in a porous microchannel

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