Slow-mode induced pulsing in trickle beds at elevated temperature for (non-)Newtonian liquids

Aydin, Bora; Fries, Dan; Lange, Rüdiger; Larachi, Faı̈çal

doi:10.1016/j.ces.2006.11.054

Cited by 9 publications

(3 citation statements)

References 8 publications

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“…There is a tendency for the transition liquid holdup to decrease especially in the higher temperatures region for both systems and regardless of superficial gas velocity and pressure. This liquid holdup tendency is similar to the one reported for the corresponding coalescing systems by Aydin et al [24]. The transition pressure drops monotonically decrease with temperature over the whole range of temperatures.…”

Section: Temperature and Pressure Evolution Of The Transition Betweensupporting

confidence: 79%

Trickle bed hydrodynamics for (non-)Newtonian foaming liquids in non-ambient conditions

Aydin

Larachi

2008

Chemical Engineering Journal

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Section: Temperature and Pressure Evolution Of The Transition Betweensupporting

confidence: 79%

Trickle bed hydrodynamics for (non-)Newtonian foaming liquids in non-ambient conditions

Aydin

Larachi

2008

Chemical Engineering Journal

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“…Among the various options for transient operation, liquid flow rate modulation is the mode the literature generally scrutinized whereby liquid pulse-base and basepulse, respectively, reminiscent of drainage and imbibition, are prompted in a periodic manner. [4][5][6][7][8][9][10] Application of flow modulation demonstrated how dry spots and partial wetting can be prevented in trickle beds when liquid pulses wet and rewet the catalyst surface in a perpetual transient state. 3 Under such deliberate unsteady-state operation, the dynamic behavior of trickle bed turns into a complex object of study.…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional simulations of gas‐liquid cocurrent downflow in vertical, inclined, and oscillating packed beds

Iliuta

Larachi

2015

AIChE Journal

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The hydrodynamic behavior of gas-liquid downflow in vertical, inclined, and oscillating packed beds related to offshore floating applications was analyzed by means of three-dimensional unsteady-state two-fluid simulations. Angular oscillations of the column between two angled symmetrical positions and between vertical and inclined position were considered while bed non-uniformity was described using radial porosity distributions. For vertical and slightly inclined columns, two-phase flow was concentrated in the core area of the bed. However, the two-phase flow was predicted to deviate significantly from axial symmetry at higher inclinations with prominent liquid accumulation in the bottommost reactor cross-sectional area. Oscillating packed beds unveiled complex reverse secondary flows radially and circumferentially resulting in oscillatory patterns of liquid holdup and pressure drop whose amplitude and propagation frequency were affected by column inclination angle and travel time between vertical and angled positions. V C 2015 American Institute of Chemical Engineers AIChE J, 62: 916-927, 2016

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“…The first detailed investigations were by Boelhouwer et al11 where liquid holdup characteristics (shock wave velocity, frequency, and morphology) were measured in slow and fast liquid flow modulation. Dependences of liquid pulse morphology were then thoroughly addressed with regard to particle size, feed frequency, temperature and pressure, in particular in the studies of Boelhouwer et al11, Giakoumakis et al12, Aydin et al13, 14 and Aydin and Larachi 15…”

Section: Introductionmentioning

confidence: 99%

Nonequilibrium thermomechanical modeling of liquid drainage/imbibition in trickle beds

2011

Self Cite

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We extend the macroscopic nonequilibrium thermomechanical multiphase flow theory proposed by Hassanizadeh and Gray for porous media to analyze a set of drainage and imbibition experiments in trickle beds. The nonequilibrium model rests on inclusion of mass and momentum conservations for the gas‐liquid interface, nonequilibrium capillary pressure, Helmholtz free energy gradients in the body supply of momentum for fluid bulk phases and gas‐liquid interface, and mass exchange rates between interface and fluid bulks accounting for production and destruction of gas‐liquid interfacial area. To solve the nonequilibrium model, entropy‐consistent constitutive relationships are derived and calibrated using liquid holdup and bed pressure drop measurements in drainage and imbibition. The model captures very well the decay (drainage), and breakthrough (imbibition) curvatures of liquid holdup and pressure drop kinetics, while model closer inspection allows assessing the role of nonequilibrium capillary pressure and of dynamic interfacial mass exchanges for the production/destruction of interfacial area. © 2011 American Institute of Chemical Engineers AIChE J, 58: 3123–3134, 2012

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Slow-mode induced pulsing in trickle beds at elevated temperature for (non-)Newtonian liquids

Cited by 9 publications

References 8 publications

Trickle bed hydrodynamics for (non-)Newtonian foaming liquids in non-ambient conditions

Trickle bed hydrodynamics for (non-)Newtonian foaming liquids in non-ambient conditions

Three‐dimensional simulations of gas‐liquid cocurrent downflow in vertical, inclined, and oscillating packed beds

Nonequilibrium thermomechanical modeling of liquid drainage/imbibition in trickle beds

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