NDLI: A Numerical Simulation of Rapid Depressurization in Pressure Vessels Incorporating Nucleate Boiling of Hydrocarbon Mixture

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Park, Ahmin Ko, Yoonae Lim, Youngsub
Copyright Year	2017
Abstract	In offshore operations, overpressure of pressure vessels can arise in case of emergencies like fire or malfunction of valves. This situation can cause physical damages of the vessel and, operation break. Thus, managing overpressure is important in terms of safety of offshore facilities. To handle the overpressure problems, the rapid depressurization, so-called ‘Blowdown’, is used. During depressurization, temperature of internal fluids in a vessel get decreases by the expansion of the fluids. Predicting decrease of the temperature is critical to choose the material of a pressure vessel. Overdesign without the prediction leads to the rapidly decreasing profit margins. For these reasons, the analyzing dynamic behavior of thermodynamics properties like temperature is required for material selection and design verification during depressurization. In this study, a dynamic model for depressurization was developed to simulate thermodynamics behavior in a vessel during depressurization including low temperature phenomena. The model contains non-equilibrium zone between phases, heat transfer between walls and fluids in the vessels. The heat transfer coefficient between internal vapor and wall was calculated from a combined convection that includes the both natural and forced convection. This study includes the calculation of liquid/wall heat transfer coefficient. During depressurization, liquid in the vessel becomes boiling closed to surface of the wall because the temperature of the wall is higher than the boiling point of the liquid. This phenomenon can be described as ‘nucleate boiling’, causes decreasing convective heat transfer coefficient from inner wall to the liquid in the vessel. Using the proper correlations about this phenomenon, the calculated coefficient made this study get closer to reality. The results were compared to experimental and simulation data from literature and it shows this model can properly estimate the thermodynamic property change in a vessel.
Sponsorship	Ocean, Offshore and Arctic Engineering Division
File Format	PDF
ISBN	9780791857632
DOI	10.1115/OMAE2017-61609
Volume Number	Volume 1: Offshore Technology
Conference Proceedings	ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering
Language	English
Publisher Date	2017-06-25
Publisher Place	Trondheim, Norway
Access Restriction	Subscribed
Subject Keyword	Temperature Vapors Valves Convection Design Thermodynamics Fluids Pressure vessels Nucleate boiling Dynamic models Safety Damage Low temperature Computer simulation Vessels Equilibrium (physics) Emergencies Boiling Phase transition temperature Simulation Fire Ocean engineering Mixed convection Heat transfer coefficients Heat transfer
Content Type	Text
Resource Type	Article

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