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A macroscopic model for the description of two-phase flow in structured packings using the concept of effective surface

Pasquier, Sylvain and Davit, Yohan and Quintard, Michel A macroscopic model for the description of two-phase flow in structured packings using the concept of effective surface. (2015) In: 2015 AICHE Annual Meeting, 8 November 2015 - 13 November 2015 (Salt Lake City, United States).

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Official URL: https://aiche.confex.com/aiche/2015/webprogram/Paper414859.html

Abstract

Columns containing structured packings play an important role in chemical engineering processes involving distillation and gas-liquid separation, such as air distillation or CO2 absorption. The packings often consist of corrugated plates that significantly increase the exchange surface between gas and liquid phases in the column. The columns are generally operated in a counter-current flow mode: a thin liquid film is driven by gravity and is sheared by the upward gas flow. The structure of the packings may be seen as a porous medium with a large porosity and multi-scale features, with a locally repeating elementary pattern. A pore-scale, associated to the elementary pattern, and a macro-scale assimilated to the packing scale, define the two-scale description. An upscaling approach was used previously to develop a macro-scale law for the gas-phase flow at relatively large Reynolds numbers [?]. At this scale the flow is governed by averaged equations, and information concerning the dynamic of the phase as well as its interactions with the solid structure are embedded in effective parameters. In this model, it was assumed, as a first approximation, that the liquid film is sufficiently thin so that its impact on the flow and the average gas pressure drop can be neglected. In this work, we propose to analyze the potential effect of the film wave instabilities on the macroscale flow and pressure drop.

Item Type:Conference or Workshop Item (UNSPECIFIED)
Additional Information:Thanks to American Institut of Chemical Engineering (AIChE). The definitive version is available at http://www3.aiche.org/proceedings/Abstract.aspx?PaperID=414859
HAL Id:hal-01274015
Audience (conference):International conference proceedings
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Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Deposited On:15 Feb 2016 10:20

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