Direct simulation of structured wall bounded packed beds using hybrid FE/FV methods

Palle, Sridhar; Aliabadi, Shahrouz

doi:10.1016/j.compfluid.2013.05.012

Cited by 11 publications

(12 citation statements)

References 24 publications

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“…Non-dimensional pressure drop, friction factors, and Reynolds numbers in packed bed studies are represented in different ways which could some time lead to confusion. Recently Palle and Aliabadi [25] described in detail different forms of expressions in literature for hydraulic diameters, friction factors, and Reynolds numbers for porous media. Hydraulic diameter (dh) for porous media which is sometimes also called hydraulic radius is defined as follows:…”

Section: Pressure Drop and Friction Factor Terminologymentioning

confidence: 99%

“…Grid independence and validation studies of our hybrid FE/FV flow solver for structured porous media flows were conducted in detail for wall bounded Simple Cubic (SC) beds in the earlier work of Palle and Aliabadi [25]. Nevertheless, for the sake of completeness and also since infinite structured beds in different packing arrangements are studied in this work, additional grid independence studies are conducted and are discussed below.…”

Section: Grid Independencementioning

confidence: 99%

“…For avoiding highly skewed mesh elements, finite contact spacing's (2% dp) were allowed between the porous particles. In the past, several studies [1,15,25] allowed finite contact spacing's in direct porous media simulations and observed very small differences due to finite contact spacing's. This can also be seen from Fig.…”

Section: Grid Independencementioning

confidence: 99%

“…Part of the reason for more widespread use of random packed beds is primarily due to their low cost and ease of use even though they might not be the most efficient packing's compared to structured beds [1]. But with the increasing requirements of lower pressure drop and better overall heat transfer rates per pressure drop, structured packed beds have been receiving increasing interest in chemical and industrial applications [1,2,[20][21][22][23][24][25]. These studies have identified that the Ergun correlation may not be suitable for predicting the friction factors in structured beds.…”

Section: Introductionmentioning

confidence: 99%

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Computational study of no-slip and rarefied slip flows in infinite structured porous media

Palle

Aliabadi

2016

Computers & Fluids

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No-slip and rarefied slip flows in infinite structured porous media are numerically investigated in this study using hybrid FE/FV methods. The hybrid FE/FV flow solver methodology is based on the pressure correction method which involves a fractional step approach to first obtain an intermediate velocity by solving the momentum equations with the matrix-free, implicit, cell-centered finite volume method. The poisson equation resulting from the fractional step approach is then solved by node based Galerkin finite element method for an auxiliary variable which is closely related to pressure and is used to update the velocity and pressure fields.Three dimensional numerical simulations are conducted using our hybrid FE/FV flow solver for analyzing fluid flow in infinite structured porous media. In this study, structured porous media is represented by packed beds of spherical particles in different packing configurations including Simple (SC), Body Centered Cubic (BCC), and FCC (Face Centered Cubic) arrangements. Finite contact spacing's (2% of particle diameter) are maintained between the spherical particles to avoid highly skewed elements during the grid generation process. Our results are compared with available experimental and numerical data for both continuum no-slip and also rarefied slip flows. For continuum no-slip flows, packing form of structured beds had a considerable influence on the pressure drop, particularly at higher Reynolds numbers. However, for rarefied flows, the influence of packing form seemed to be negligible. It was also observed that infinite random porous media correlations are unsuitable for predicting the friction factors and/or pressure drop in structured porous media for

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Section: Pressure Drop and Friction Factor Terminologymentioning

confidence: 99%

Section: Grid Independencementioning

confidence: 99%

Section: Grid Independencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Computational study of no-slip and rarefied slip flows in infinite structured porous media

Palle

Aliabadi

2016

Computers & Fluids

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“…Palle and Aliabadi [5] used direct numerical simulation for a structured packed bed in simple cubic (SC) configuration. They studied the friction factor for both infinite and wall bounded structured packed beds and proposed correlations for modified friction factor.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Flow and Heat Transfer in Structured Packed Beds with Smooth or Dimpled Spheres at Low Channel to Particle Diameter Ratio

Zhou

Yang

et al. 2018

Energies

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Packed beds are widely used in catalytic reactors or nuclear reactors. Reducing the pressure drop and improving the heat transfer performance of a packed bed is a common research aim. The dimpled structure has a complex influence on the flow and heat transfer characteristics. In the present study, the flow and heat transfer characteristics in structured packed beds with smooth or dimpled spheres are numerically investigated, where two different low channel to particle diameter ratios (N = 1.00 and N = 1.15) are considered. The pressure drop and the Nusselt number are obtained. The results show that, for N = 1.00, compared with the structured packed bed with smooth spheres, the structured packed bed with dimpled spheres has a lower pressure drop and little higher Nusselt number at 1500 < ReH < 14,000, exhibiting an improved overall heat transfer performance. However, for N = 1.15, the structured packed bed with dimpled spheres shows a much higher pressure drop, which dominantly affects the overall heat transfer performance, causing it to be weaker. Comparing the different channel to particle diameter ratios, we find that different configurations can result in: (i) completely different drag reduction effect; and (ii) relatively less influence on heat transfer enhancement.

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Experimental and numerical study on pressure drop and heat transfer performance of grille-sphere composite structured packed bed

et al. 2018

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Direct simulation of structured wall bounded packed beds using hybrid FE/FV methods

Cited by 11 publications

References 24 publications

Computational study of no-slip and rarefied slip flows in infinite structured porous media

Computational study of no-slip and rarefied slip flows in infinite structured porous media

Numerical Simulation of Flow and Heat Transfer in Structured Packed Beds with Smooth or Dimpled Spheres at Low Channel to Particle Diameter Ratio

Experimental and numerical study on pressure drop and heat transfer performance of grille-sphere composite structured packed bed

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