Time-dependent hydrodynamics of bubble columns

0580754 - ÚCHP 2024 US eng A - Abstract
Obligado, M. - Orvalho, Sandra - Terentyak, Mark - Davelman, A. - Růžička, Marek - Cartellier, A.
Time-dependent hydrodynamics of bubble columns.
Session R41, Bubbly Flows II. American Physical Society, 2023, č. článku R41.00004. ISBN N.
[Annual Meeting of the Division of Fluid Dynamics /76./. 19.11.2023-21.11.2023, Washington, DC]
Institutional support: RVO:67985858
Keywords : bubble column * hydrodynamic * optical probe
OECD category: Chemical process engineering

We present experimental results for bubble columns with different diameters in both the homogenous and heterogeneous regime. We cover two different time-dependent situations. First, the startup of the bubble column is considered. This unsteady regime consists on injecting a fixed gas flowrate starting from zero. The time that bubbles require to reach the free surface and the duration of the unsteady regime are then analyzed. Later, we focus on the fluctuations of several quantities (void fraction, bubble velocity…) within stable operating conditions. Our results show that even within steady gas injection conditions, all studied parameters present significant fluctuations.
Permanent Link: https://hdl.handle.net/11104/0349516