סמינר מחלקה של - יעקב נז'יובסקי - חקירה ניסיונית של אי-יציבות של זרימה דו-פזית רבודה בצינורות מלבניות.
School of Mechanical Engineering Seminar
Wednesday, August 4 2021 at 14.00
EXPERIMENTAL INVESTIGATION OF INSTABILITY OF STRATIFIED TWO-PHASE FLOW IN RECTANGULAR DUCTS
Under supervision of Prof. Alexander Gelfgat
This work is devoted to an experimental investigation of the onset of instability in two-phase flows in a rectangular duct. The onset of instability inside the duct is characterized by a change from stratified to wavy flow. Experiments were made in a rectangular duct, in which air and water are flowing at the atmospheric pressure. The superficial velocities at which an unstable wavy flow regime sets in were found. The waves frequency at the critical superficial velocities were measured by a digital analysis of a laser beam spot created after the laser beam crosses both liquids and the interface. Measurements were made at various holdups ranging from 0.2 to 0.6. To maintain a constant holdup, a superficial velocities ratio was kept unchanged by a specially designed mechanical system.
Results of these experiments were compared with the recent numerical predictions. It was found that the experimental and numerical results are close, which validates the previously published computationally obtained stability diagrams.
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