Fluid‐dynamic and mass‐transfer behavior of static mixers and regular packings

Cavatorta, O. N.; Böhm, Ursula; Giorgio, A. M. Chiappori De Del

doi:10.1002/aic.690450504

Cited by 30 publications

(22 citation statements)

References 17 publications

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“…1, together with the mass transfer coefficients obtained with the same electrolytic solution and the active plates under tricklebed conditions (TB), i.e., with gas-liquid co-current downflow. Forced convection results were in excellent agreement with previous investigations [18,19]. As can be seen from Fig.…”

Section: Mass Transfersupporting

confidence: 92%

Mass Transfer In Trickle‐Bed Reactors With Structured Packing

Battista

Böhm²

2003

Chem Eng & Technol

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An experimental investigation was carried out to examine the fluid dynamic and mass transfer behavior of structured packing, with the liquid and gas phase flowing co-currently downwards in the column. Liquid to packing mass transfer coefficients for three positions within the pack were measured by an electrochemical method, varying both the liquid and gas loads as well as the physical properties of the liquid phase. Due to the high void fraction of structured packing, much higher liquid flow rates can be used than in traditional particle trickle-beds. It was found that in the range studied, the gas superficial velocity has no effect on the mass transfer rate and thus, a general mass transfer correlation in terms of liquid Reynolds number only, was developed. Wetted areas and the radial distribution of liquid through the packing element were determined by a colorimetric method. Within the range of liquid flow rates investigated, complete wetting is not achieved, even with the low viscosity solutions. The measured ratios of hydraulic to geometric area, agree reasonably well with values predicted by existing relationships.

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Section: Mass Transfersupporting

confidence: 92%

Mass Transfer In Trickle‐Bed Reactors With Structured Packing

Battista

Böhm²

2003

Chem Eng & Technol

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“…Nevertheless, when placed on the column bottom, static mixers can be used as a gas sparger instead of perforated plates, achieving lower pressure drop and less sensitivity to fouling as with the orifice distributors. [12,13,19] With no net liquid circulation, the gas holdup obtained in the packed bubble column is altered only slightly by addition of suspended particles, depending on the solids concentration and physical characteristics, differences being always smaller than 20 %.…”

Section: Gas-liquid Systems Bubble Columnsmentioning

confidence: 99%

“…The pressure drop is almost the same because the friction generated inside the packing element is predominant over the pressure loss due to the inlet and outlet flow in case of the static mixer. [5,13,19] All experimental results obtained with regular packing and with static mixers may be represented by a single equation of the type of the well-known empirical relationship of Richardson and Zaki. In the case of fluidized beds with high Galileo number, the system geometry has no effect on the nature of fluidization; the expansion behaves within the packing in the same way as in an empty tube.…”

Section: Introductionmentioning

confidence: 99%

“…For low Galileo numbers higher particle loads can be used in the presence of the regular packing than in empty columns and higher flow rates can be achieved without producing entrainment. [9,12,18,19,23] The presence of structured packing enhances the gas holdup in comparison to empty column values. The shear forces in the channel intersection points split the gas phase into small bubbles, thus reducing the rising velocity.…”

Section: Introductionmentioning

confidence: 99%

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Systems with Structured Packing: Fluid-Dynamics and Liquid-Solid Mass Transfer

Cavatorta

Böhm

2000

Chem. Eng. Technol.

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“…(Blomerius et al, 1999;Cavatorta et al, 1999;Focke and Knibbe, 1986). Examples are plate heat exchangers, static mixers, regenerators, adsorbers, and catalyststo name a few.…”

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confidence: 99%

Flow Regimes of Air-Water Counterflow Through Cross Corrugated Parallel Plates

Almeida

Riahi-Nezhad

2001

Separation Science and Technology

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Heretofore unknown flow regimes of air-water counterflow through a pair of transparent vertical parallel cross corrugated plates were observed via high-speed video. Air flows upward driven by pressure gradient and water, downward driven by gravity. The crimp geometry of the corrugations was drawn from typical corrugated sheets used as filling material in modern structured packed towers. Four regimes were featured, namely, rivulet, bicontinuous, flooding fronts, and flooding waves. It is conceivable that the regimes observed might constitute the basis for understanding how gas and liquid phases contend for available space in the interstices of structured packings in packed towers. Flow regime transitions were expressed in terms of liquid load (liquid superficial velocity) and gas flow factor parameters commonly used in pressure drop and capacity curves. We have carefully examined the range of parameters equivalent to the ill-understood high-liquid-flow operation in packed towers. More importantly, our findings should prove valuable in validating improved first-principles modeling of gas-liquid flows in these industrially important devices.

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Fluid‐dynamic and mass‐transfer behavior of static mixers and regular packings

Cited by 30 publications

References 17 publications

Mass Transfer In Trickle‐Bed Reactors With Structured Packing

Mass Transfer In Trickle‐Bed Reactors With Structured Packing

Systems with Structured Packing: Fluid-Dynamics and Liquid-Solid Mass Transfer

Flow Regimes of Air-Water Counterflow Through Cross Corrugated Parallel Plates

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