Fully-developed, forced convective flow through an annular packed-sphere bed with wall effectsEcoulement de convection forcee etabli a travers un lit fixe de spheres annulaire avec effet de paroiVoll ausgebildete erzwungene konvektionsströmung durch ein ringförmiges kugelschüttbett mit randeffektenПoлHocTяю paзвиToэ выHyждeHHo-кoHвeкTивHoe TэчeHиe чepeз кoльцeвoи, зaпoлHeHHый cфepичecкими чacTицaми cлoй, c yчeToм пpиcTeHHыч эффeкToв
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Cited by (103)
Mixed convection phenomenon in packed beds: A comprehensive review
2022, Thermal Science and Engineering ProgressCitation Excerpt :Vafai [126] analysed experimentally and theoretically the channelling effect on the forced convection flow along an isothermal flat plate, and found that the channelling effect has a significant influence on the heat transfer augmentation for high porosity and high Reynolds number conditions. Cheng and Hsu [127] tested the effect of solid wall on the thermal dispersion in forced convection flows during an annular packed bed of spheres. Generally speaking, the inclusion of thermal dispersion and flow maldistribution effects aid in augmenting the energy transport process and their incorporation in the simulation would, thus, provide better simulation of the actual problem.
Experimental and numerical analysis of void structure in random packed beds of spheres
2021, Powder TechnologyCitation Excerpt :There are some models trying to describe the radial porosity distribution of sphere packings [46]. These comprise exponential decay functions [47–52], which ignore the oscillation close to the wall, damped oscillation functions with an exponentially damped cosine oscillation [8,10,22,53,54] or a Bessel function of zero order [28,55,56], approaches incorporating λ-specific adaptions [28,43,45], and mathematical sphere center re-estimations derived from experimentally obtained radial porosity profiles with subsequent re-calculation of the radial porosity distribution [57–61]. In Fig. 2, selected correlations are plotted along with literature data for tube-to-particle diameter ratios around 4.
Comparison between pseudohomogeneous and resolved-particle models for liquid hydrodynamics in packed-bed reactors
2021, Chemical Engineering Research and DesignIdentification of the process windows of inclined rotating fixed-bed reactors with concentric tube – A hydrodynamic analysis
2020, Chemical Engineering ScienceCitation Excerpt :Furthermore, N describes the slope of the porosity in the vicinity of the walls and a wide range for N is reported in the literature (du Toit, 2008; Vortmeyer and Schuster, 1983; Cheng and Hsu 1986). For example, Cheng and Hsu (1986) applied N = 2, while Hunt and Tien (1988) proposed N = 8. Sodre and Parise (1998) described a linear relation between particle-to-annulus diameter ratio and N, however, non-linear behavior is rather expected at wider parameter range.
CFD modelling of mass and heat dispersion in sphere fixed bed with porosity-dependent segmented-continuum approaches
2019, Chemical Engineering Research and Design