Solid-Liquid Mass Transfer and Wetting Factors in Trickle Bed Reactors: Effect of the Type of Solid Phase and the Presence of Chemical Reaction

González-Mendizabal, Dosinda; Aguilera, María Eugenia; Pironti, F. F.

doi:10.1080/00986449808912720

Cited by 12 publications

(12 citation statements)

References 29 publications

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“…In macroscale gas–liquid flows in packed beds, it is recognized that particle wetting depends strongly on liquid velocity and weakly on gas velocity. 18 , 50 Even though capillary forces are expected to alter this behavior in the microscale, to what extent wetting effects are influential in the microscale packed bed used in this work is difficult to ascertain. For this reason, in our analysis, we use an appropriately defined Sherwood number, accounting for potentially incomplete utilization of the copper surface area: where a 2phase is the specific copper surface area active during the two-phase mass transfer experiments (which is not known but measured together with k s ′ ).…”

Section: Resultsmentioning

confidence: 99%

“…Other investigators who studied L-S mass transfer in similar or larger scale reactors reported similar insignificant or weak positive effects of gas velocity on mass transfer. [13][14][15]18,49,56 In particular, Hirose et al, 15 Satterfield et al, 16 and Rao and Drikenburg 19 observed that the L-S mass transfer coefficient was not affected (or weakly affected) by gas velocity, except during transition from a gas continuous flow (low interaction regime) to pulse flow (high interaction regime), when it increased. In such macroscale systems the bubbles in the liquid phase decrease the cross-sectional area available for liquid flow, increasing the liquid velocity, whereas they can also disturb the boundary layer around the particles.…”

mentioning

confidence: 99%

“…This trend is much more significant in macroscale systems. Various investigators 13,15,18,49,56 observed a strong increase of L-S mass transfer coefficient during two-phase flow with liquid velocity, attributed to enhancement of solid wetting by the liquid and a decrease in the thickness of the liquid film surrounding the particles. It is worth mentioning that a fixed value of the liquid holdup of 0.75 was employed in the calculation of the L-S mass transfer coefficients.…”

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confidence: 99%

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Study of Liquid–Solid Mass Transfer and Hydrodynamics in Micropacked Bed with Gas–Liquid Flow

Cao

Radhakrishnan

Hasanudin

et al. 2021

Ind. Eng. Chem. Res.

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The volumetric liquid–solid (L-S) mass transfer coefficient under gas–liquid (G-L) two-phase flow in a silicon-chip-based micropacked bed reactor (MPBR) was studied using the copper dissolution method and was related to the reactor hydrodynamic behavior. Using a high-speed camera and a robust computational image analysis method that selectively analyzed the bed voidage around the copper particles, the observed hydrodynamics were directly related to the L-S mass transfer rates in the MPBR. This hydrodynamic study revealed different pulsing structures inside the packed copper bed depending on the flow patterns established preceding the packed bed upon increasing gas velocity. A “liquid-dominated slug” flow regime was associated with an upstream slug flow feed. A “sparse slug” flow regime developed with an upstream slug-annular flow feed. At higher gas velocity, a “gas continuous with pulsing” regime developed with an annular flow feed, which had similar features to the pulsing flow in macroscale packed beds, but it was sensitive and easily destabilized by disturbances from upstream or downstream pressure fluctuations. The volumetric L-S mass transfer coefficient decreased with increasing gas velocity under the liquid-dominated slug flow regime and became rather less affected under the sparse slug flow regime. By resolving the transition from the liquid-dominated slug flow to the sparse slug flow and capturing the onset of the gas-continuous with pulsing regime, we gained new insights into the hydrodynamic effects of G-L flows on the L-S mass transfer rates in a MPBR.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Study of Liquid–Solid Mass Transfer and Hydrodynamics in Micropacked Bed with Gas–Liquid Flow

Cao

Radhakrishnan

Hasanudin

et al. 2021

Ind. Eng. Chem. Res.

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“…In particular, trickle-bed reactors get special attention due to the effect of wetting fraction on the overall reactor performance and reactor safety. The phenomena are mainly described by correlating equations reflecting experimental data [6,16,20,29,39,40]. This work shows, however, that available correlations are not applicable to predict the wetting fraction of solid foam packing.…”

Section: Wetting Fraction Correlation and Comparison With Random Packingmentioning

confidence: 97%

“…The figure shows good agreement between the experimental and predicted wetting fraction; the average error (R 2 ) was less than 10%. Additionally, the figure shows data derived from trickle-bed reactors from References [6,29,39,40].…”

Section: Wetting Fraction Correlation and Comparison With Random Packingmentioning

confidence: 99%

Wetting Fraction in a Tubular Reactor with Solid Foam Packing and Gas/Liquid Co-Current Downflow

Mohammed

Hampel

2018

Catalysts

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The performance of fixed-bed reactors with structured catalysts depends heavily on the gas–liquid–solid contacting pattern. For a broad range of flow conditions, the liquid phase does not cover the solid surface of the packing homogeneously; this is known as partial wetting. The wetting fraction in solid foams was obtained using a modified electrochemical measurement method with adaption of the limiting-current technique in different pre-wetting scenarios. The external wetting fraction, which is defined as fraction of the external solid-foam area covered by the liquid phase to the total external solid-foam area, is directly linked to the overall rate of reaction through the overall liquid mass transfer rate. The wetting fraction decreased with an increase in foam density, a process which was related to decreasing the strut thickness, increasing foam surface area, and consequently, decreasing the wetted area. Additionally, the results indicate that a better distribution of liquid and an increased wetting fraction occurred when a spray nozzle distributor was applied. A new wetting correlation for solid foams is proposed to estimate the wetting fraction with consideration of foam morphology and flow regime.

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Numerical evaluation of the gas–liquid interfacial heat transfer in the trickle flow regime of packed beds at the micro and meso-scale

Heidari

Hashemabadi

2013

Chemical Engineering Science

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Solid-Liquid Mass Transfer and Wetting Factors in Trickle Bed Reactors: Effect of the Type of Solid Phase and the Presence of Chemical Reaction

Cited by 12 publications

References 29 publications

Study of Liquid–Solid Mass Transfer and Hydrodynamics in Micropacked Bed with Gas–Liquid Flow

Study of Liquid–Solid Mass Transfer and Hydrodynamics in Micropacked Bed with Gas–Liquid Flow

Wetting Fraction in a Tubular Reactor with Solid Foam Packing and Gas/Liquid Co-Current Downflow

Numerical evaluation of the gas–liquid interfacial heat transfer in the trickle flow regime of packed beds at the micro and meso-scale

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