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Numerical modeling and parametric sensitivity analysis of heat transfer and two-phase oil and water flow characteristics in horizontal and inclined flowlines using OpenFOAM

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Petroleum Science 2023年第2期20卷 1183-1199页

作者： Nsidibe Sunday Abdelhakim Settar khaled chetehouna Nicolas Gascoin INSA Centre Val de Loire UniversitéOrléansPRISME EA 4229F-18020BourgesFrance

Estimating the oil-water temperatures in flowlines is challenging especially in deepwater and ultra-deepwater offshore applications where issues of flow assurance and dramatic heat transfer are likely to occur due to the temperature difference between the fluids and the surroundings. Heat transfer analysis is very important for the prediction and prevention of deposits in oil and water flowlines, which could impede the flow and give rise to huge financial losses. Therefore, a 3D mathematical model of oil-water Newtonian flow under non-isothermal conditions is established to explore the complex mechanisms of the two-phase oil-water transportation and heat transfer in different flowline inclinations. In this work, a non-isothermal two-phase flow model is first modified and then implemented in the InterFoam solver by introducing the energy equation using OpenFOAM® code. The Low Reynolds Number (LRN) k-ε turbulence model is utilized to resolve the turbulence phenomena within the oil and water mixtures. The flow patterns and the local heat transfer coefficients (HTC) for two-phase oil-water flow at different flowlines inclinations (0°, +4°, +7°) are validated by the experimental literature results and the relative errors are also compared. Global sensitivity analysis is then conducted to determine the effect of the different parameters on the performance of the produced two-phase hydrocarbon systems for effective subsea fluid transportation. Thereafter, HTC and flow patterns for oil-water flows at downward inclinations of 4°, and 7° can be predicted by the models. The velocity distribution, pressure gradient, liquid holdup, and temperature variation at the flowline cross-sections are simulated and analyzed in detail. Consequently, the numerical model can be generally applied to compute the global properties of the fluid and other operating parameters that are beneficial in the management of two-phase oil-water transportation.

关键词： Flow assurance Flow pattern Heat transfer Flowlines Two-phase flow Global sensitivity analysis

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Thermal behavior of an isolator with mode transition inducing back-pressure of a dual-mode scramjet

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Chinese Journal of Aeronautics 2017年第2期30卷 595-601页

作者： Yang Qingchun Bao Wen chetehouna khaled Zhang Silong Gascoin Nicolas School of Astronautics Beihang University 100083 China School of Energy Science and Engineering Harbin Institute of Technology 150001 Harbin China INSA Centre Val de Loir 88 Boulevard Lahitolle 18000 Bourges France

Combustion mode transition is a valuable and challenging research area in dual-mode scramjet *** thermal behavior of an isolator with mode transition inducing backpressure is investigated by direct-connect dual-mode scramjet experiments and theoretical *** experiments are conducted under the incoming airflow conditions of total temperature1270 K and Mach 2.A small increment of the fuel equivalence ratio is scheduled to trigger mode ***,the variation of the coolant flow rate is very *** on the measured wall pressures,the heat-transfer model can quantify the thermal state variation of the engine with active *** with the combustor,mode transition has a greater effect on the isolator thermal behavior,and it significantly changes the isolator heat-flux and wall *** further study the isolator thermal behavior from flight Mach 4 to Mach 7,a theoretical analysis is carried *** the critical point of combustion mode transition,sudden changes of the isolator flowfield and thermal state are discussed.

关键词： Combustion mode Dual-mode scramjet Isolator Mode transition Thermal behavior

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