2026 · Conference
Goa, India, 7–10 December 2026. Four oral presentations and two posters from the project, on the flow regimes and the gas holdup of bubble columns, their CFD simulation, the shape of single bubbles and the absorption of CO₂ in ionic liquids. The abstracts can be downloaded below.
Poster
GLS-17, Goa.
An overview of the AURIGA project: a theoretical framework that links the local and the global flow properties and gives an analytical form of the bubble column operating curve, and the experimental facilities built to support it, from single bubbles to the full reactor.
Oral presentation
GLS-17, Goa.
Predictive models for the end of the homogeneous regime are tested against an extensive database of gas holdup and drift flux curves, in which every transition point was identified with the same criteria. Empirical correlations, semi-empirical formulations and a linear stability analysis are compared, to establish how far the transition can be predicted a priori.
Poster
GLS-17, Goa.
Twenty-one gas holdup correlations from the literature are evaluated against a database of 216 experimental curves and more than 6000 data points, covering a wide range of column geometries, fluids, spargers and operating modes. The error of each correlation is broken down by operating condition, to give a practical guide to which correlation to use where.
Oral presentation
GLS-17, Goa. Work carried out with IFP Energies Nouvelles.
A two-fluid CFD model, built on the multiphase solver developed at HZDR, is validated against the global gas holdup and the radial profiles of void fraction and liquid velocity in air–water columns of 0.4 m and 1 m diameter, and then tested on a nitrogen–heptane system.
Oral presentation
GLS-17, Goa. Work carried out with the Complex Fluids and Flows Unit, Okinawa Institute of Science and Technology.
Direct numerical simulations with the volume-of-fluid method, combined with experimental data on single bubbles, give a new correlation for the bubble aspect ratio as a function of the Reynolds and Eötvös numbers. The correlation is then used to predict how the concentration of [Bmim][BF4] in water changes the shape of the bubbles.
Oral presentation
GLS-17, Goa. Work carried out with the Hamburg University of Technology.
CO₂ absorption in aqueous mixtures of two hydrophilic ionic liquids, [EMIM][OAc] and [BMIM][BF4]. Density, viscosity and surface tension are measured over the full composition range at three temperatures, the CO₂ solubility is measured gravimetrically, and the liquid-side mass transfer coefficient is obtained from a stationary Taylor bubble.