Numerical study of choked two-phase flow of hydrocarbons fluids through orifices |
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| Institution: | 1. Dipartimento di Ingegneria Industriale e Scienze Matematiche, Università Politecnica delle Marche, Via Brecce Bianche 12, Ancona, Italy;2. Facoltà di Ingegneria, Università degli Studi eCampus, Novedrate, Italy;3. Saipem S.p.A., Fano, Italy;1. School of Nuclear Engineering, Purdue University, West Lafayette, IN 47907, United States;2. Division of Advanced Nuclear Engineering, POSTECH, Pohang 790-784, Republic of Korea;3. Canadian Nuclear Safety Commission, Ottawa, Ontario, Canada;1. School of Mechanical Engineering, Yonsei University, Seoul 03722, Republic of Korea;2. Climate Change Research Division, Korea Institute of Energy Research, Daejeon 34129, Republic of Korea;3. School of Mechanical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea;1. University of Pisa (UNIPI), GRNSPG\\DESTEC, Italy;2. Scientific Consultant, France;3. Commissariat à l’énergie atomique et aux énergies alternatives (CEA) – Saclay, France;4. Framatome, France;5. Korea Atomic Energy Research Institute (KAERI), Republic of Korea;6. VTT Technical Research Centre of Finland (VTT), Finland;7. State Power Investment Corporation Research Institute (SPICRI), PR China;8. Électricité de France (EDF), DIPNN – DT, France;9. Canadian Nuclear Laboratories (CNL), Canada;1. Department of Nuclear Engineering, Chosun University, 309 Pilmun-daero, Dong-gu, Gwangju, Republic of Korea;2. Thermal Hydraulics and Severe Accident Research Division, Korea Atomic Energy Research Institute, 111 Daedeok-daero, 989 Beon-gil, Yuseoung-gu, Daejeon, Republic of Korea;1. Tianjin Key Laboratory of Process Measurement and Control, Tianjin 300072, China;2. Chengdu Verification Branch for Natural Gas Flow Meter of National Crude Oil Large Flow Measurement Station, Chengdu 610213, China;3. PetroChina Planning & Engineering Institute, Beijing 100083, China;4. School of Electrical Engineering & Automation, Tianjin University, Tianjin 300072, China;1. DIISM, Università Politecnica delle Marche, Via Brecce Bianche 12, 60131, Ancona, Italy;2. Scuola di Architettura e Design, Università di Camerino, Piazza Cavour 19/f 62032 Camerino, Italy;3. Tecnoconsult Engineering Construction Srl, Via Einaudi, 22, 61032 Fano, Italy;4. ENI SpA, Via Emilia, 1, 20097 San Donato Milanese, MI, Italy;5. Faculty of Engineering, Università degli Studi eCampus, 22060, Novedrate, Italy |
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| Abstract: | Valves and orifices are the most widely devices of flow control used in oil and gas industry. In particular, they are installed in relief piping system in order to control the discharge flow during potential plant overpressuring scenarios, thus ensuring plant safety. It is a common practice to flow liquid and gas mixtures through such restriction devices.Rigorous models are available to precisely size pressure relief devices operating in single phase flow; however for two-phase flow, no models are considered sufficiently reliable for predicting the relevant flow conditions.In the present paper, two-phase flow of hydrocarbons fluids through an orifice under critical conditions has been numerically investigated.The existing literature has been analyzed and data on two-phase flow of highly volatile mixtures of hydrocarbons through openings have been collected. A comparison has been carried out with numerical simulations carried out by the multiphase flow simulation tool OLGA by SPT.The Henry–Fauske model has been used as orifice choke model and the orifice discharge flow coefficient, required as input by OLGA, has been calculated by Chisholm's model.Comparison between OLGA's results and experimental data shows that Henry–Fauske model markedly underestimates the mass flow rate through the orifice, if Chisholm's model is used to calculate discharge coefficient. It was found that the error of the model could be minimized using different values of orifice discharge coefficient (Cd).A new discharge flow coefficient model, suitable for choked two-phase flow across orifices, is proposed in this study and it has been determined to match the above mentioned experimental measurements. |
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| Keywords: | Two-phase flow Hydrocarbons Orifices Discharge coefficient |
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