Gas holdup and flow regime transition in spider-sparger bubble column: effect of liquid phase properties

34th UIT Heat Transfer Conference 2016

Besagni, G.^1 ; Inzoli, F.^1 ; De Guido, G.^2 ; Pellegrini, L.A.^2

Politecnico di Milano, Department of Energy, Via Lambruschini 4a, Milano

20156, Italy^1

Politecnico di Milano, Dipartimento di Chimica, Materiali e Ingegneria Chimica G. Natta, Piazza Leonardo da Vinci 32, Milano

20133, Italy^2

关键词: Flow regime transition;    Gas superficial velocity;    Homogeneous flow;    Liquid phase properties;    Liquid velocities;    Monoethylene glycol;    Superficial velocity;    Transition flow regime;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/796/1/012041/pdf
DOI  :  10.1088/1742-6596/796/1/012041

来源: IOP

【 摘 要 】

This paper discusses the effects of the liquid velocity and the liquid phase properties on the gas holdup and the flow regime transition in a large-diameter and large-scale counter-current two-phase bubble column. In particular, we compared and analysed the experimental data obtained in our previous experimental studies. The bubble column is 5.3 m in height, has an inner diameter of 0.24 m, it was operated with gas superficial velocities in the range of 0.004-0.20 m/s and, in the counter-current mode, the liquid was recirculated up to a superficial velocity of -0.09 m/s. Air was used as the dispersed phase and various fluids (tap water, aqueous solutions of sodium chloride, ethanol and monoethylene glycol) were employed as liquid phases. The experimental dataset consist in gas holdup measurements and was used to investigate the global fluid dynamics and the flow regime transition between the homogeneous flow regime and the transition flow regime. We found that the liquid velocity and the liquid phase properties significantly affect the gas holdup and the flow regime transition. In this respect, a possible relationship (based on the lift force) between the flow regime transition and the gas holdup was proposed.