الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 150 |  |  |
| | | from | 150 | | |
Abstract
Introduction:Studying control valves especially, butterfly valve performance coefficients and related phenomena are very important in industrial applications.The research problem : Experimental and numerical investigations of butterfly valve performance coefficients in normal and cavitated conditions are presented at valve disk angles 30°,40°,50°,60°,70°, and 90°.The research aims: Developing single and two phase numerical models and validate them by using experimental data, as well as investigating numerically and experimentally the effect of cavitation on performance coefficients.Steps of study : The thesis presents an introduction about the ISA test rig for control valve capacity curve and a literature review of numerical and experimental calculations for control valve performance. Numerical single and two phase models with different algorithms using FLUENT 6.3 are presented to investigate the most accurate and efficient model results that agree with experimental. Experimental test has been introduced at valve disk angles 30°, 40°, 50°, 60°, 70°, and 90° by using ISA test rig. A series of experimental and numerical runs for different operating disk angles for non- cavitated and cavitated conditions are compared and the effect of cavitation presence is also performed.The study concludes: The two phase numerical results concord with the experimental data at all disk angles. However single phase numerical results agree with the experimental result only at large disk angles. The cavitation causes the flow and torque coefficients to decrease while the loss coefficient to increase.