A TWO-PHASE CFD ANALYSIS OF GEYSERING WITH APPLICATIONS TO THERMOSYPHONS AND LOW PRESSURE POOL BOILING
Ciccotosto, Bruce Edward
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https://hdl.handle.net/2142/121550
Description
Title
A TWO-PHASE CFD ANALYSIS OF GEYSERING WITH APPLICATIONS TO THERMOSYPHONS AND LOW PRESSURE POOL BOILING
Author(s)
Ciccotosto, Bruce Edward
Issue Date
2023-07-21
Director of Research (if dissertation) or Advisor (if thesis)
Brooks, Caleb S
Committee Member(s)
Grunloh, Timothy P
Uddin, Rizwan
Department of Study
Nuclear, Plasma, & Rad Engr
Discipline
Nuclear, Plasma, Radiolgc Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Cfd
Multiphase
Fluid Dynamics
Heat Transfer
Thermosyphons
Heat Pipes
Language
eng
Abstract
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.
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