Experimental measurements versus linear stability analysis for primary instability of stratified two-phase flows in a square rectangular duct. (August 2022)

• Record Type: Journal Article
• Authors: Nezihovski, Yakov; Gelfgat, Alexander; Ullmann, Amos; Brauner, Neima
• Is Part Of: International journal of multiphase flow. Volume 153(2022)
• Publication Date: 2022-08
• Subjects: Two-phase flow -- Non-intrusive measurement -- Stability -- Interfacial waves -- Stability map; Multiphase flow -- Periodicals; Écoulement polyphasique -- Périodiques; Multiphase flow; Periodicals; 620.1064
• DOI: 10.1016/j.ijmultiphaseflow.2022.104061
• Languages: English
• ISSNs: 0301-9322

Abstract

Highlights: Stability of stratified two-phase pressure driven flow in a square pipes is experimentally studied. The results are obtained by a partially novel non-intrusive technique. A wide range of the two superficial velocities is explored. The experimental results are successfully compared with numerical predictions. Abstract: The onset of the primary instability of two-phase stratified flow in a square duct was studied experimentally. Measurements were carried out by a specially designed fully non-intrusive technique. Critical values of the two superficial velocities corresponding to the primary instability of air-water stratified flows in a square duct were measured and successfully compared with the computationally predicted stability diagram. Along with the good quantitative agreement between the experimentally measured and numerically predicted critical superficial velocities, a qualitative agreement was obtained between predicted and measured frequencies of the critical perturbations.