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oai:www.ideals.illinois.edu:2142/83925 2023-07-11 col_2142_5131 col_2142_14787 com_2142_5130 com_2142_9630 com_2142_234

Predrag Hrnjak Bowers, Chad D. 2015-09-25T21:12:44Z 2015-09-25T21:12:44Z 10000-01-01 2009 2009 In order to understand the characteristics of the adiabatic development of two-phase flow this study was performed using H2FC-CF 3 - 1,1,1,2-Tetrafluoroethane (R134A) as a working fluid in three different transparent tubes. The flow was visualized using a high speed camera. To better (faster and more objectively) analyze the flow, a technique was developed to determine the separation distance using a statistical method known as Change Point Analysis. The distance at which the phases become separated can be an important parameter in design of inlet tubes to evaporators. A method for determining the void fraction from the visualization results was developed and presented. This method allows for a local, instantaneous or time averaged, void fraction determination in Stratified, Intermittent, and Annular flows and could conceivably be implemented into an online void fraction determination. Qualitative examination of these images allowed for the determination of the distinct regions of flow development: Well-Mixed, Separating, Separated but Developing, and Developed regions. Dynamic examples of transitions between flow regimes in the process of flow development were also presented; specifically, transitions from Stratified to Intermittent flow. Made available in DSpace on 2015-09-25T21:12:44Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3362735.pdf: 7142086 bytes, checksum: 5068e2c05350938500ff7b75e2e20f29 (MD5) Previous issue date: 2009 Embargo set by: Seth Robbins for item 85206 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 216 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2009. http://hdl.handle.net/2142/83925 (MiAaPQ)AAI3362735 eng Engineering, Mechanical Developing Adiabatic Two-Phase Flow text Mechanical Engineering Mechanical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.