Multiphase flows appear in various industrial processes, ranging from energy to process, thermal to transport systems, in biological systems from the cardiovascular to the respiratory system and in the environment from ocean waves to climate. Such flows are particularly present in key industries, including the petroleum and nuclear energy in particular, where oil, gas, steam and water are often produced and transported together. During co-current flow in a pipe the multiphase flow topology can acquire a variety of characteristic distributions called flow regimes, or flow patterns, each featuring specific hydrodynamic characteristics (e.g. bubbly, slug, annular, mist, churn) depending on the phasic volumetric flow rates. In addition, the relative volumetric fraction of the phases can change along the pipes either because of heat addition from outside, heat exchanges between the phases or flashing due to depressurization. Some of these hydrodynamic features are clearly undesirable particularly in the hydrocarbon transportation systems, for example slug flow, which may be harmful to some operations components.
Topological classifications of the multiphase flows are based on interface structures. Such classifications are often difficult to make since the interface structure changes continuously. However, they can be broadly classified into three major regimes and several sub-regimes:
• Stratified flows (film flow, annular flow, horizontal stratified and jet flow),
• Mixed or transitional flows (cap, slug, churn-turbulent flow, bubbly annular flow, droplet annular flow and bubbly-droplet annular flow, etc.),
• Dispersed flows (bubbly flow, droplet flow and flow with solid particles).
The choice of an appropriate model to simulate flows of different regimes is not always obvious. TransAT has a rich portfolio of models to cope with most of these flows. The multiphase methods available in TransAT and their applicability to different problems will be elaborated
About the Speaker
Dr. Chidambaram Narayanan
Chidu Narayanan works as a Principal Engineer in the Advanced Modelling & Simulation group in AFRY Switzerland, Zürich. Chidu is a Founding Partner at ASCOMP AG and headed the technology development and industry consulting activities since its founding. He is the chief technologist for the development of TransAT, a state-of-the-art software specialized in simulation of complex multiphase flows. He has been instrumental in developing innovative technologies such as Immersed Surface technology, compressible multiphase models, and all-regime multiphase flow model into TransAT. He has acquired and executed several challenging consulting projects for large corporations primarily in nuclear, energy, and process engineering sectors. He has published more than 70 journal and conference papers and is an expert in simulation software development, advanced turbulence modelling, multiphase modelling, and numerical methods.
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