Non-Newtonian fluid flow in plane channels: Heat transfer enhancement using porous blocks

Nebbali, Rachid; Bouhadef, Khedidja

doi:10.1016/j.ijthermalsci.2011.04.013

Cited by 31 publications

(7 citation statements)

References 26 publications

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“…The initial azimuthal velocity of the inner cylinder is set to 0.15, the mesh size to 20 × 76, and the radius ratio to 0.5. For the non-Newtonian fluid flows the exponent n was chosen in the range between 0.5 and 1.5 while the Reynolds number was varied from 20 to 150 [35][36][37][38][39][40][41][42][43][44][45][46][47][48]. 053002-9 Figure 4 illustrates the dimensionless azimuthal velocity along the radial position for different values of the power-law index n. It is shown that the velocity profile decays gradually along the radial position for the considered fluids.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Numerical investigation of non-Newtonian fluids in annular ducts with finite aspect ratio using lattice Boltzmann method

Khali

Nebbali²,

De³

et al. 2013

Phys. Rev. E

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In this work the instability of the Taylor-Couette flow for Newtonian and non-Newtonian fluids (dilatant and pseudoplastic fluids) is investigated for cases of finite aspect ratios. The study is conducted numerically using the lattice Boltzmann method (LBM). In many industrial applications, the apparatuses and installations drift away from the idealized case of an annulus of infinite length, and thus the end caps effect can no longer be ignored. The inner cylinder is rotating while the outer one and the end walls are maintained at rest. The lattice two-dimensional nine-velocity (D2Q9) Boltzmann model developed from the Bhatnagar-Gross-Krook approximation is used to obtain the flow field for fluids obeying the power-law model. The combined effects of the Reynolds number, the radius ratio, and the power-law index n on the flow characteristics are analyzed for an annular space of finite aspect ratio. Two flow modes are obtained: a primary Couette flow (CF) mode and a secondary Taylor vortex flow (TVF) mode. The flow structures so obtained are different from one mode to another. The critical Reynolds number Re(c) for the passage from the primary to the secondary mode exhibits the lowest value for the pseudoplastic fluids and the highest value for the dilatant fluids. The findings are useful for studies of the swirling flow of non-Newtonians fluids in axisymmetric geometries using LBM. The flow changes from the CF to TVF and its structure switches from the two-cells to four-cells regime for both Newtonian and dilatant fluids. Contrariwise for pseudoplastic fluids, the flow exhibits 2-4-2 structure passing from two-cells to four cells and switches again to the two-cells configuration. Furthermore, the critical Reynolds number presents a monotonic increase with the power-law index n of the non-Newtonian fluid, and as the radius ratio grows, the transition flow regimes tend to appear for higher critical Reynolds numbers.

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Section: Numerical Results and Discussionmentioning

confidence: 99%

Numerical investigation of non-Newtonian fluids in annular ducts with finite aspect ratio using lattice Boltzmann method

Khali

Nebbali²,

De³

et al. 2013

Phys. Rev. E

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“…Due to the Darcy equation in Reynolds number very low Re << 1 (called creeping current) decreases the amount of pressure drop by increasing the permeability. Nebbali and Bouhadef [38] investigated the effect of using porous barriers on increasing the heat transfer of non-nuclide fluids in horizontal channels. In their work, they used the Brinkman-Forchimer model, which extended the Darcy model for porous media, and used two geometric models for the porous medium.…”

Section: International Journal Of Advanced Engineering Management Anmentioning

confidence: 99%

Using Porous Media to Enhancement of Heat Transfer in Heat Exchangers

Rashidian¹,

Tavakoli²

2017

IJAEMS

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“…The use of porous/fluid composite systems is an innovative method able to provide valuable solutions for improving energy the efficiency of thermal systems. This can have a positive impact in areas ranging from preservation of energy resources to limiting global warming [1,2].…”

Section: Introductionmentioning

confidence: 99%

Heat transfer investigation of non-newtonian fluid flow in anannular pipe embedded with porous discs: A turbulent study

POURSHARIF

SALARIAN

JAVAHERDEH

et al. 2022

Journal of Thermal Engineering

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Porous materials are used in thermal devices such as heat exchangers to improvement the heat transfer. The heat transfer of a non-Newtonian fluid flow in an annular pipe with porous discs is numerically investigated in this paper. The flow regime in both porous medium and clear region are considered to be turbulent. The effects of power-law index of the non-Newtonian fluid and porous discs pitch variationson the heat transfer rate, friction coefficient are studied and compared to each other for two porous layer thicknesses. Finally, the thermal performance is defined which determines the optimum porous media and non-Newtonian fluid characteristics in the annular pipe.

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Non-Newtonian fluid flow in plane channels: Heat transfer enhancement using porous blocks

Cited by 31 publications

References 26 publications

Numerical investigation of non-Newtonian fluids in annular ducts with finite aspect ratio using lattice Boltzmann method

Numerical investigation of non-Newtonian fluids in annular ducts with finite aspect ratio using lattice Boltzmann method

Using Porous Media to Enhancement of Heat Transfer in Heat Exchangers

Heat transfer investigation of non-newtonian fluid flow in anannular pipe embedded with porous discs: A turbulent study

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