The analysis of a two-phase slug flow is of immense importance due to its vast applications inmany industrial problems. A number of experimental and analytical studies have been carried out to studythis complex and unwanted phenomenon. Mostly, these studies were limited to the liquid phase and to thestatistical parameters and formation mechanism. So far, no attempt has been made to study the phaseinteraction and coupling effects of both phases simultaneously, which is more important in understandingthis complex flow behavior. This kind of study requires the instantaneous velocity fields of both phasessimultaneously. Therefore, in this study a PIV-LIF technique has been applied to study two-phase (liquid-gas) slug flow in a laboratory facility. Water and gas were considered as working fluids, and slug flow wasgenerated in a nearly horizontal pipe with an inclination of 1.16 to consider the terrain slugging mechanism.Liquid and gas phases were seeded simultaneously with fluorescent and titanium dioxide tracerparticles, respectively. Two CCD cameras installed with low pass and band pass filters were used to captureimages for separate phases. Instantaneous velocity field for both liquid and gas phases was measuredsimultaneously. To extract the coherent structures and for the analysis of turbulence in liquid and gas phase,the proper orthogonal decomposition (POD) analysis technique was applied to the velocity fields. Largeenergy containing modes were successfully revealed by POD. The energy distribution of spatial modes forboth phases was also measured and compared.
Bibliographical noteThe final publication is available at Springer via http://dx.doi.org/10.1007/s12650-015-0302-1
- simultaneous velocity
- pipe flow
- slug flow