2026-09-26T07:25:37Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/121550 2023-12-13 col_2142_5131 col_2142_14837 com_2142_5130 com_2142_14836 com_2142_234

Brooks, Caleb S Grunloh, Timothy P Uddin, Rizwan 2023-08 application/pdf en text Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms The student, Bruce Ciccotosto, accepted the attached license on 2023-07-20 at 11:49. The student, Bruce Ciccotosto, submitted this Thesis for approval on 2023-07-20 at 12:19. This Thesis was approved for publication on 2023-07-21 at 07:20. DSpace SAF Submission Ingestion Package generated from Vireo submission #19739 on 2023-12-04 at 17:03:23 A TWO-PHASE CFD ANALYSIS OF GEYSERING WITH APPLICATIONS TO THERMOSYPHONS AND LOW PRESSURE POOL BOILING Ciccotosto, Bruce Edward 2023-07-21 Cfd Multiphase Fluid Dynamics Heat Transfer Thermosyphons Heat Pipes Under certain operating conditions, thermosyphons can experience a sharp periodic increase in pressure of 30% or more known as geysering. This can lead to fatigue or bursting of the pressure vessel giving an immediate loss in cooling capability and a safety concern. The current work presents a computational model for studying the fluid dynamics of geysering within a two phase closed thermosyphon. Phase change is modeled via source terms in the governing equations and the resulting phase motion is compared to experimental data from literature. The model can resolve the fluid motion of both phases during the slug growth, bursting and draining stages with good qualitative agreement. The model also correctly predicts the pressure rising rate during the growth stage, the peak pressure and timescale of peak pressure compared to ensemble average empirical data. The simulation setup, parameter sensitivity, and current limitations of the model are discussed in detail. Future work is needed to resolve the pressure decay after bursting and various recommendations are given. Text eng https://hdl.handle.net/2142/121550 Copyright 2023 Bruce Ciccotosto M.S. Thesis Nuclear, Plasma, Radiolgc Engr University of Illinois at Urbana-Champaign Nuclear, Plasma, & Rad Engr