Experimental Analysis of Multi-phase flows in orifice
Master thesis
Permanent lenke
https://hdl.handle.net/11250/3027386Utgivelsesdato
2022Metadata
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Sammendrag
In order to understand the behavior of multi-phase flow through orifices in horizontal pipes,an experimental approach is applied that utilizes the available flow rig in the multi-phase flowlaboratory at the University of Stavanger. A test pipe of 0.7m was created that would alloweasy changing of orifices. Several different geometries were used in the pipe to compare flowmechanisms at different flow rates. Superficial velocities for water ranged from 0.35 to 0.75 m/sand from 0.04 m/s to 0.1 m/s for air. Pressure drop across the orifice was measured, and a videosystem was used in order to obtain images of flow under selected conditions.Orifice meters have been widely used in single-phase metering. However, a simplistic approachto understanding multi-phase flow has been applied. Therefore, in addition to understandingfluid dynamics in a single-hole orifice, a multi-hole orifice is also used. It is observed that to someextent pressure fluctuations are reduced when using a multi-hole orifice plate. Therefore, a hypothesisinvolving multiple jets that reduce the overall disturbance is made.The recorded pressure drop signals give insights into the flow behavior, and results indicatedthat at higher pressure drops, a significant amount of air flows through orifice. Hence,the results of this study have demonstrated an ability to visualize flow disturbances across orificeplates with cheaper materials and replicate the industrial process in the multi-phase flow lab.