Thesis supervisor: Csaba Hős
Location of studies (in Hungarian): Department of Hydrodynamic Systems Abbreviation of location of studies: HDR
Description of the research topic:
a.) Antecedents: Vessels, fittings and equipment in the chemical and process industry as well as in the oil and gas sector are processing mixtures of multiple compounds. During an emergency relief of pressurized systems through safety valves, part of the liquid mixture may flash (evaporate) and the pressure of the multiphase, multi-component flow may reach the critical pressure that needs to be vented to protect the facility. Standard approaches of analyzing both pipeline dynamics and valve dynamics usually focus on single-component flow. Following the need of the industry, novel techniques are to be developed to cope with the multicomponent nature of real-life systems both in terms of wave phenomena in complex looped pipelines and valve motion (fluid forces, stability, etc.). The supervisor has a considerable background on valve and pipeline dynamics analysis.
b.) Aim of research: The aim of this research is to develop analytical and numerical techniques that allow the prediction of fluid dynamics and valve stability in multicomponent systems.
c.) Tasks, main items, necessary time:
• Literature survey, 1 semester.
• Thermodynamic model of multicomponent flow (equilibrium and non-equilibrium), 1 semester.
• Multicomponent flow through valve (analytical and CFD model), 1 semester.
• Reduced valve model, pipeline dynamics, initial computations, 1 semester.
• Validation of the simulation framework, 2 semester.
• (Continuous) publication activity, thesis writing, additional 2 semester.
d.) Required equipment: personal computer, laboratory.
e.) Expected scientific results: The research is expected to provide design tools (analytical and/or computer simulation framework) for valve chatter prediction in multicomponent systems.
f.) References:
• CJ Hős, AR Champneys, Kenneth Paul, M McNeely: Dynamic behavior of direct spring loaded pressure relief valves in gas service: Model development, measurements and instability mechanisms, Journal of Loss Prevention in the Process Industries, Vol. 31, pp. 70-81, 2014
• C Bazsó, CJ Hős: An experimental study on the stability of a direct spring loaded poppet relief valve, Journal of Fluids and Structures, Volume 42, pp. 456-465
Required language skills: english Number of students who can be accepted: 1
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