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Multiphase flow separators are integral parts of petroleum, chemical and nuclear facilities. The subject of this PhD thesis is the computational and experimental investigation of the flow behavior of multiphase flows in energy partial phase separation systems. In this thesis, an alternative and partial mixture separation technique of air-water flow, with a new cavity separator is presented. The operating principle of the separating mechanism is based on the street canyon effect, where air vortex recirculation within a vertical cavity to the flow happens, without requiring additional energy loss. The proposed separator was examined with ANSYS Fluent and experimentally at a new laboratory facility. Τhe compared results showed very good agreement.During the initial sets of simulations and experiments, a pipe with rectangular cross section and hydraulic diameter Dh: 34 mm, was used. The position of the separator outlet hole is located on the upper surface of the cavity, to exploit the dens ...
Multiphase flow separators are integral parts of petroleum, chemical and nuclear facilities. The subject of this PhD thesis is the computational and experimental investigation of the flow behavior of multiphase flows in energy partial phase separation systems. In this thesis, an alternative and partial mixture separation technique of air-water flow, with a new cavity separator is presented. The operating principle of the separating mechanism is based on the street canyon effect, where air vortex recirculation within a vertical cavity to the flow happens, without requiring additional energy loss. The proposed separator was examined with ANSYS Fluent and experimentally at a new laboratory facility. Τhe compared results showed very good agreement.During the initial sets of simulations and experiments, a pipe with rectangular cross section and hydraulic diameter Dh: 34 mm, was used. The position of the separator outlet hole is located on the upper surface of the cavity, to exploit the density difference between the fluids. Subsequently, computational and experimental investigation was performed on separators with different aspect ratios AR (0.6, 1.1 and 2.2). The next investigation, examines the rotated pipe 90° towards the flow, with three applied symmetrical separators AR: 1. The separation performance η (%) was improved at low gaseous and liquid phases. The next study, examines the behavior of individual separator, located at five positions (5, 10, 15, 20 and 25Dh) as well as combinations of two, three and five in – row separators. The optimal performance was achieved with a separator fitted 10Dh from the mixture input. In addition, the case of a flap application at the separator region was examined and yielded high separation values.New flow maps of air – water two – phase vertical flow were designed during the experimental sets, with one or two separators (AR: 1 and 2.2). The combination of the two regular (AR: 1) separators in a row, achieved higher separation efficiency values. Moreover, pressure drop comparison among the homogenous, the dispersed flow and the Fluent pressure values was performed. Finally, the cavity separator was applied to complex horizontal – vertical pipes. Also, methane–oil efficiency comparison was performed with satisfactory, but lower separation values compared to the relative ones of the air–water mixture. Additional data, such as Tables with the experimental operating conditions, the methodology for the calculation of the first cell y height and CAD designs, are presented in the Appendix.
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