Experimental investigation of liquid distribution over structured packing

Алексеенко, С. В.; Маркович, Д. М.; Evseev, A. R.; Бобылев, А. В.; Tarasov, B. V.; Karsten, V. M.

doi:10.1002/aic.11498

Cited by 22 publications

(19 citation statements)

References 17 publications

(15 reference statements)

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“…Actually, at the macroscale, the capillary pressure translates the local curvilinear gas–liquid interface dynamic. The effect of capillary dispersion is, therefore, consistent with Alekseenko et al experiments that showed the presence of a meniscus at the sheet's contact points. They also showed that, at this very spot, the liquid is redistributed over the corrugated surface.…”

Section: Mathematical Modelsupporting

confidence: 89%

“…These phases are not (except perhaps at very low saturation) completely independent, since adjacent sheets are in contact and the wetting liquid can flow from one sheet to the other. This latter point is confirmed in the experimental study done by Alekseenko et al who measured by fiber‐optic sensors the thickness of the liquid film in the space confined by two adjacent corrugated sheets. They have shown that, in the vicinity of the contact points between corrugated sheets, menisci form is at the origin of local liquid flow redistribution over the corrugated surfaces.…”

Section: Introductionsupporting

confidence: 65%

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Gas–liquid flow modeling in columns equipped with structured packing

et al. 2014

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International audienceThis paper deals with the modeling of gas-liquid flow in distillation columns equipped with structured packing. The devices are seen as bi-structured porous media and a macro-scale model is proposed taking into account this specific geometry. In this model, the two liquid films, one-per-sheet, are treated separately and are allowed to exchange matter at the vicinity of the contact points between corrugated sheets. The model emphasizes mechanisms that lead to the liquid radial dispersion effects: a main part comes from the geometry itself, another part is due to the capillary effects. A particular attention is paid to model these phenomena from a macro-scale point of view. Finally, the simulation results are confronted to tomography imaging within a lab-scale column and show a qualitative good agreement of the liquid distribution

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Section: Mathematical Modelsupporting

confidence: 89%

Section: Introductionsupporting

confidence: 65%

Gas–liquid flow modeling in columns equipped with structured packing

et al. 2014

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“…The main limitation of this method is possible hysteresis during the contact between the needle and the film surface. However, this method was retained (i) because the rear side of the reactor was made of stainless steel, and so techniques based on light absorption or capacitance (or resistance) were inapplicable [24][25][26][27][28], and (ii) because the technique had to be mobile to measure the film thickness over the entire tilted surface; techniques requiring highly accurate alignments, such as optical fibers [29][30][31] or fluorescent techniques [25,32,33] were therefore difficult to apply. For each condition, 15 measurements were made over the whole tilted surface to analyze film evenness.…”

Section: Hydrodynamics and Gas-liquid Mass Transfer 321 Liquid Filmentioning

confidence: 99%

Development of a thin-film solar photobioreactor with high biomass volumetric productivity (AlgoFilm©) based on process intensification principles

Pruvost

Borgne²,

Artu

et al. 2017

Algal Research

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This work presents the rational development up to its final characterization and validation of an intensified solar photobioreactor (PBR) for microalgal production, AlgoFilm©. Our aim was to achieve very high volumetric performance for phototrophic conditions, in the range of that found in fermentation processes. The overall design procedure was underpinned by robust engineering rules derived from knowledge models developed for PBR in-depth modeling. This approach was used to pinpoint the main engineering parameters governing PBR kinetic performance. It introduces generic principles of PBR performance enhancement for the setting-up of culture systems combining high volumetric and areal productivities. These principles were then applied to the design of a solar culture system, integrating the attendant constraints. The result was the AlgoFilm© PBR, based on the falling-film principle, which enables very thin culture depth (around 1.5-2 mm) and provides a high specific illuminated surface area (around 500 m 2 •m −3 , corresponding to 2.1 L/m 2 illuminated surface). A complete experimental characterization was then conducted to (i) determine operating conditions for the setting of optimal parameters governing AlgoFilm© PBR performance, such as depth of the falling film, and (ii) ensure that no limitation other than light occurred, a mandatory condition to control the system and ensure high biomass productivities. AlgoFilm© PBR performance was characterized by Chlorella vulgaris culture. Batch, continuous and semicontinuous cultures were run, and typical irradiation conditions of a year's operation in Nantes (France) were applied using a LED panel to simulate constant, and then fully-controlled day/night cycles. Our results demonstrate the high performance of the AlgoFilm© PBR, with volumetric productivities very close to those expected from the prior theoretical design. The best measured productivity was 5.7 kg•m −3 •day −1 (7.07 kg•m −3 •day −1 in constant light). This value was significantly higher than those reported in the literature, and similar to those generally found for microalgal production in heterotrophic processes.

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“…However, studying the effects of different dumped and structured packing types, column internals and distributor designs on liquid distribution, spreading and emerging flow patterns requires time-consuming measurements and, thus, provides only time-averaged data that do not take flow dynamics and local flow patterns into account. To counterbalance the low temporal and spatial resolution such collector devices are often complemented by fast optical and electrical probes installed at few selected locations [13,14]. But the permissible number of such probes is rather small with respect to the possible spatial flow variations and also such instruments are invasive and, therefore, may have a considerable impact on the flow.…”

Section: Liquid Distribution Measurement Techniquesmentioning

confidence: 99%

Advanced Tomographic Techniques for Flow Imaging in Columns with Flow Distribution Packings

Schubert

Bieberle

Barthel

et al. 2011

Chemie Ingenieur Technik

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Design and optimization of separation units, e.g., distillation and absorption columns with flow distribution packings, require detailed knowledge about the internal flow conditions and their impact on the process behavior. This in turn calls for suitable measuring techniques, which can give a detailed insight into such devices, especially for studies on a laboratory and pilot scale. Traditional instrumentation, such as compartment-type liquid collectors installed below packings, or distributed temperature, pressure and conductivity probes, often falls too short if detailed knowledge on flow conditions is required. This concerns especially local liquid holdup, liquid maldistribution, liquid films thickness, wetting of the packing surface, or bubble size and droplet distribution at trays. Advanced imaging techniques, such as tomography, have found only marginal attention in investigations of separation columns with structured and modern dumped flow distribution packings, mostly due to limited spatial and temporal resolution but also due to prevailing technological problems encountered in such applications. In this study, the potentials and limits of some of the most recently emerged tomographic imaging modalities for multiphase flows have been investigated and reviewed, i.e., ultra-fast X-ray tomography, high-resolution gamma-ray tomography, wire-mesh sensor techniques, and X-ray microtomography with respect to a possible application in separation columns with flow distribution packings.

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Experimental investigation of liquid distribution over structured packing

Cited by 22 publications

References 17 publications

Gas–liquid flow modeling in columns equipped with structured packing

Gas–liquid flow modeling in columns equipped with structured packing

Development of a thin-film solar photobioreactor with high biomass volumetric productivity (AlgoFilm©) based on process intensification principles

Advanced Tomographic Techniques for Flow Imaging in Columns with Flow Distribution Packings

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