Hold-up of mellapak structured packings

Suess, P.; Spiegel, Lothar

doi:10.1016/0255-2701(92)85005-m

Cited by 158 publications

(136 citation statements)

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“…34,48 High-capacity packings have been introduced to counteract this problem. 49,50 The idea is to bend the sheets near the joint from the standard 45 inclination to a vertical (90 ) orientation to facilitate a smoother flow transition.…”

Section: Effect Of Corrugation Angle (M250y/m250x) and Element Interfmentioning

confidence: 99%

A dimensionless model for predicting the mass‐transfer area of structured packing

et al. 2011

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The mass-transfer area of nine structured packings was measured in a 0.427 m ID column via absorption of CO 2 from air into 0.1 kmol/m 3 NaOH. The mass-transfer area was most strongly related to the specific area (125-500 m Áh). Surface tension (30-72 mN/m) had a weaker but significant effect. Gas velocity (0.6-2.3 m/s), liquid viscosity (1-15 mPaÁs), and flow channel configuration had essentially no impact on the mass-transfer area. Surface texture (embossing) increased the effective area by 10% at most. The ratio of mass-transfer area to specific area (a e /a p ) was correlated within the limits of AE13% for the entire experimental database a e a p ¼ 1:34

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Section: Effect Of Corrugation Angle (M250y/m250x) and Element Interfmentioning

confidence: 99%

A dimensionless model for predicting the mass‐transfer area of structured packing

et al. 2011

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“…[6] and Suess et al [8]. The liquid used in these tests is Genosorb 300, which displays a surface tension of 3 8 .…”

Section: Experimental Datamentioning

confidence: 99%

Interfacial area of mellapak packing: Absorption of 1,1,1‐trichloroethane by Genosorb 300

et al. 1995

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In this work a Sulzer structured packing, Mellapak 250Y, was studied for applications in the field of absorption. A new model was proposed which makes it possible to estimate the packing surface that actually takes part in the process. In the course of these studies, new experimental data were obtained relating to the absorption of 1,t, t -trichloroethane using Genosorb 300, a mixture of polyethylene glycol dimethyl ethers produced by Hoechst S.p.A., as absorption liquid. The results obtained with the proposed model are in agreement both with the experimental measurements made in the course of the work and with experimental absorption measurements reported by other authors on water systems.

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“…For instance, in structured packings used for separation processes, a thin liquid film is strongly sheared by a countercurrent gas phase and often displays surface instabilities. The fact that both phases flow countercurrently (K wa U a = 0) combined with the development of instabilities (larger values of K wa ) may greatly increase the impact of cross terms, potentially leading to strong liquid retention [57]. Our results then suggest that the quantitative analysis of the retention phenomenon requires an accurate estimation of the coupling terms, something often overlooked in the literature.…”

Section: B Imbibition: Air-water Flow In Highly Permeable Mediamentioning

confidence: 81%

Modeling two-phase flow of immiscible fluids in porous media: Buckley-Leverett theory with explicit coupling terms

2017

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 18578 Continuum models that describe two-phase flow of immiscible fluids in porous media often treat momentum exchange between the two phases by simply generalizing the single-phase Darcy law and introducing saturation-dependent permeabilities. Here we study models of creeping flows that include an explicit coupling between both phases via the addition of cross terms in the generalized Darcy law. Using an extension of the Buckley-Leverett theory, we analyze the impact of these cross terms on saturation profiles and pressure drops for different couples of fluids and closure relations of the effective parameters. We show that these cross terms in the macroscale models may significantly impact the flow compared to results obtained with the generalized Darcy laws without cross terms. Analytical solutions, validated against experimental data, suggest that the effect of this coupling on the dynamics of saturation fronts and the steady-state profiles is very sensitive to gravitational effects, the ratio of viscosity between the two phases, and the permeability. Our results indicate that the effects of momentum exchange on two-phase flow may increase with the permeability of the porous medium when the influence of the fluid-fluid interfaces become similar to that of the solid-fluid interfaces.

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Hold-up of mellapak structured packings

Cited by 158 publications

References 1 publication

A dimensionless model for predicting the mass‐transfer area of structured packing

A dimensionless model for predicting the mass‐transfer area of structured packing

Interfacial area of mellapak packing: Absorption of 1,1,1‐trichloroethane by Genosorb 300

Modeling two-phase flow of immiscible fluids in porous media: Buckley-Leverett theory with explicit coupling terms

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