Slow-mode gas/liquid-induced periodic hydrodynamics in trickling packed beds derived from direct measurement of cross-sectional distributed local capacitances

Schubert, Markus; Kryk, Holger; Hampel, Uwe

doi:10.1016/j.cep.2010.08.004

Cited by 27 publications

(13 citation statements)

References 41 publications

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“…As shown earlier in Figure , liquid waves were attenuated along the column for all cyclic operations. It is worthy of notice that operating conditions and cyclic frequencies influence the wave attenuation as reported in other studies . To assess those effects, a dimensionless liquid wave intensity parameter defined by Eq.…”

Section: Resultsmentioning

confidence: 97%

“…Such measuring technique gave access to images (100 Hz) of liquid volumetric distributions in the interrogated bed cross‐sections using as a contrasting property the difference between gas and liquid electrical permittivity values nearby the WMS cross‐point voxels. Details about the WMS principle, calculation procedure, and applications can be found elsewhere …”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

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Cyclic operation strategies in inclined and moving packed beds—Potential marine applications for floating systems

Dashliborun

Larachi

Hamidipour³

2016

AIChE Journal

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The hydrodynamics of a periodically operated packed bed subjected to column oscillations and obliquity was studied. Electrical capacitance tomography (ECT) and capacitance wire mesh sensors were employed to measure the local instantaneous liquid saturation in stationary slanted and moving packed beds, respectively. A swell simulator with sixdegree-of-freedom motions was applied to emulate the behavior of floating packed beds. The results revealed that column inclination from the vertical position considerably decayed liquid waves excited by different cyclic operation strategies. However, ON-OFF liquid and gas/liquid alternating cyclic operations showed an attempt to conserve wave identity in the slanted bed and to decrease phase maldistribution resulting from bed inclination. It was also found that symmetric and non-symmetric split ratios of ON-OFF liquid cyclic mode were able to noticeably decrease fluid maldistribution in the oscillating packed bed. This study opens up possible prospects for process intensification of floating packed bed reactors and contactors.

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Section: Resultsmentioning

confidence: 97%

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

Cyclic operation strategies in inclined and moving packed beds—Potential marine applications for floating systems

Dashliborun

Larachi

Hamidipour³

2016

AIChE Journal

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“…The aptitude of the sensor for the investigation of several multiphase flow phenomena has been proven for (i) gas-liquid flow in pipes [16,17], (ii) multiphase flow in TBR [9,18,19], and (iii) the hydrodynamic characterization of open-cell foams in tubular reactors [20].…”

Section: Wire-mesh Sensor and Parameter Extraction From Pulse Experimmentioning

confidence: 99%

“…Several studies revealed the benefits of periodic flow rate modulation like an increase in the time-averaged reaction rates [5], which is mainly attributed to higher mass transfer rates [6] and the potential to decelerate catalyst deactivation by reducing its overheating [7]. A drawback of this operation strategy is the intensity decay of the liquid pulses downstream the reactor [8,9], especially at elevated temperature and pressure to which most industrial applications are subjected [10]. Thus, the beneficial impact of this approach in large scale reactors might be reduced.…”

Section: Introductionmentioning

confidence: 97%

Liquid backmixing in an inclined rotating tubular fixed bed reactor – Augmenting liquid residence time via flow regime adjustment

Härting¹,

Berger²,

Lange³

et al. 2015

Chemical Engineering and Processing - Process Intensification

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“…Wire mesh sensors can produce images of bubbles in real time through signal measurement at a higher frequency than the timescale of flow dynamics [9][10][11]. They have also proven useful for characterization of trickling flows in packed beds [12,13]. Comparisons to capacitance tomography applied to the cross section of 6.7 and 10 cm pipes [13,14] have demonstrated an advantage in spatial resolution with the wire mesh, for which the resolution corresponds to the electrode pitch.…”

Section: Introductionmentioning

confidence: 99%

Void Detection in Dielectric Films Using a Floating Network of Substrate-Embedded Electrodes

Taylor

Garimella

2014

Journal of Electronic Packaging

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A sensor is developed for simple, in situ characterization of dielectric thermal interface materials (TIMs) at bond line thicknesses less than 100 lm. The working principle is based on the detection of regions of contrasting electric permittivity. An array of long, parallel electrodes is flush-mounted into each opposing substrate face of a narrow gap interface, and exposed to the gap formed between the two surfaces. Electrodes are oriented such that their lengthwise dimension in one substrate runs perpendicular to those in the other. A capacitance measurement taken between opposing electrodes is used to characterize the interface region in the vicinity of their crossing point (junction). The electric field associated with each electrode junction is numerically simulated and analyzed. Criteria are developed for the design of electrode junction geometries that localize the electric fields. The capacitances between floating-ground electrodes in the electrode sensor configuration employed give rise to a nontrivial network of interacting capacitances which strongly influence the measured response at any junction. A generalized solution for analyzing the floating network response is presented. The technique is used to experimentally detect thermal grease spots of 0.2 mm to 1.8 mm diameter within a 25 lm interface gap. It is necessary to use the generalized solution to the capacitance network developed in this work to properly delineate regions of contrasting permittivity in the interface gap region using capacitance measurements.

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Slow-mode gas/liquid-induced periodic hydrodynamics in trickling packed beds derived from direct measurement of cross-sectional distributed local capacitances

Cited by 27 publications

References 41 publications

Cyclic operation strategies in inclined and moving packed beds—Potential marine applications for floating systems

Cyclic operation strategies in inclined and moving packed beds—Potential marine applications for floating systems

Liquid backmixing in an inclined rotating tubular fixed bed reactor – Augmenting liquid residence time via flow regime adjustment

Void Detection in Dielectric Films Using a Floating Network of Substrate-Embedded Electrodes

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