Effect of fin position and porosity on heat transfer improvement in a plate porous media heat exchanger

Mehrizi, Abbasali Abouei; Farhadi, Mousa; Sedighi, Kurosh; Delavar, Mojtaba Aghajani

doi:10.1016/j.jtice.2012.12.018

Cited by 61 publications

(17 citation statements)

References 30 publications

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“…Here α m and υ m are given by Equations (8) and (9) and the effective viscosity and heat conductivity are given by Equations (1) and (2). The eddy viscosity is evaluated from the Prandtl-Kolmogorov relation: The turbulence kinetic energy production term is given as:…”

Section: Governing Equations For Cfd Simulationmentioning

confidence: 99%

“…The focus of the present study is the non-circular cross-section's plate heat exchangers which are used extensively in various applications including in power generation and power recovery, the food industry, the chemical industry, refrigeration and air conditioning systems [1]. The compact design and the high energy efficiency of the plate heat exchangers have made them quite attractive [2]. Plain and corrugated plate heat exchangers with non-circular cross-sections have shown superior performance compared to other conventionally used heat exchangers such as concentric or double-pipe heat exchangers.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Heat Transfer and Pressure Drop in Fully Developed Turbulent Flows of Graphene Nanoplatelets–Silver/Water Nanofluids

Safaei

Ahmadi

Goodarzi

et al. 2016

Fluids

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This study examined the heat transfer coefficient, friction loss, pressure drop and pumping power needed for the use of nanofluid coolants made of a mixture of suspension of graphene nanoplatelets-silver in water in a rectangular duct. A series of calculations were performed for the coolant volume flow rate in the range of 5000 ď Re ď 15,000 under a fully developed turbulent flow regime and different nanosheet concentrations up to 0.1 weight percent. The thermo-physical properties of the nanofluids were extracted from the recent experimental work of Yarmand et al.(Graphene nanoplatelets-silver hybrid nanofluids for enhanced heat transfer. Energy Convers. Manag. 2015, 100, 419-428). The presented results indicated that the heat transfer characteristics of the nanofluid coolants improved with the increase in nanosheet concentration as well as the increase in the coolant Reynolds number. However, there was a penalty in the duct pressure drop and an increase in the required pumping power. In summary, the closed conduit heat transfer performance can be improved with the use of appropriate nanofluids based on graphene nanoplatelets-silver/water as a working fluid.

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Section: Governing Equations For Cfd Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Heat Transfer and Pressure Drop in Fully Developed Turbulent Flows of Graphene Nanoplatelets–Silver/Water Nanofluids

Safaei

Ahmadi

Goodarzi

et al. 2016

Fluids

View full text Add to dashboard Cite

show abstract

“…Methods based on the Lattice Boltzmann equations (LBE) have recently evolved as an approach to direct solutions of the macroscopic equations in porous media [15][16][17][18], nanofluid [19], phase change [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35], shock tube problem [36], droplet formation [37,38], turbulent natural convection [39] and so on [40][41][42]. Due to its particulate nature, the LBM has some benefits over the conventional Computational fluid dynamics (CFD) techniques such as handling complex boundaries and physical phenomena, the straightforward implementation on parallel machines, the incorporation of microscopic interactions and high speed of solving.…”

Section: Introductionmentioning

confidence: 99%

RETRACTED ARTICLE: Melting of nanoparticles-enhanced phase change material (NEPCM) in vertical semicircle enclosure: numerical study

Jourabian

Farhadi

2015

J Mech Sci Technol

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Convection melting of ice as a Phase change material (PCM) dispersed with Cu nanoparticles, which is encapsulated in a semicircle enclosure is studied numerically. The enthalpy-based Lattice Boltzmann method (LBM) combined with a Double distribution function (DDF) model is used to solve the convection-diffusion equation. The increase in solid concentration of nanoparticles results in the enhancement of thermal conductivity of PCM and the decrease in the latent heat of fusion. By enhancing solid concentration of nanoparticles, the viscosity of nanofluid increases and convective heat transfer dwindles. For all Rayleigh numbers investigated in this study, the insertion of nanoparticles in PCM has no effect on the average Nusselt number.

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“…An example of pore-scale turbulent flow modelled using LBM is provided in [11], where four types of porous structures are considered. Unfortunately, despite the LBM offering some advantages, it still suffers in a similar manner to continuum approaches as a consequence of the complex geometries involved [17]. In order to represent better the types of complex geometries found in cellular material, the authors have investigated the use of fractals [2,18], which arise in many other areas of science [19] and play a part in describing a variety of behaviours in nonlinear systems [20].…”

Section: Introductionmentioning

confidence: 99%

A tessellated continuum approach to thermal analysis: discontinuity networks

Jiang

Davey

Prosser

2016

Continuum Mech. Thermodyn.

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Tessellated continuum mechanics is an approach for the representation of thermo-mechanical behaviour of porous media on tessellated continua. It involves the application of iteration function schemes using affine contraction and expansion maps, respectively, for the creation of porous fractal materials and associated tessellated continua. Highly complex geometries can be produced using a modest number of contraction mappings. The associated tessellations form the mesh in a numerical procedure. This paper tests the hypothesis that thermal analysis of porous structures can be achieved using a discontinuous Galerkin finite element method on a tessellation. Discontinuous behaviour is identified at a discontinuity network in a tessellation; its use is shown to provide a good representation of the physics relating to cellular heat exchanger designs. Results for different cellular designs (with corresponding tessellations) are contrasted against those obtained from direct analysis and very high accuracy is observed.

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Effect of fin position and porosity on heat transfer improvement in a plate porous media heat exchanger

Cited by 61 publications

References 30 publications

Heat Transfer and Pressure Drop in Fully Developed Turbulent Flows of Graphene Nanoplatelets–Silver/Water Nanofluids

Heat Transfer and Pressure Drop in Fully Developed Turbulent Flows of Graphene Nanoplatelets–Silver/Water Nanofluids

RETRACTED ARTICLE: Melting of nanoparticles-enhanced phase change material (NEPCM) in vertical semicircle enclosure: numerical study

A tessellated continuum approach to thermal analysis: discontinuity networks

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