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Liquid film falling behaviour on horizontal circular cylinder

Journal of Central South University 2012年第5期19卷 1353-1358页

作者： CHUNG Han-shik K.Wusiman KIM Seong-soo B.Nasan H.Afrianto Hafizur Rehman CHOI Du-youl JEONG Hyo-min Department of Energy and Mechanical Engineering The Institute of Marine IndustryGyeongSang National UniversityTongYoungGyeongNam 650-160Korea Department of Mechanical and Precision Engineering GyeongSang National UniversityTongYoungGyeongNam 650-160Korea Fluid and Thermal Engineering Co. Ltd.GimHae-siGyungNam 621-843Korea

The flow pattern behaviour of falling liquid film over three horizontal cylinders was *** flows can take three forms:discrete droplets,individual jets,and continuous sheet,and special attention is paid to the effects of the physical properties and geometrical parameters of the first two forms(droplets and jets) because these forms are more important in heat-transfer behaviour and less research has been published for these forms,The flow modes and experimental results were successfully compared with previous experimental literatures,and also the effects of liquid flow rate,tube diameter,and tube spacing on departure site spacing,in both drop and jet modes,were evaluated in the low Galileo number and high viscosity fluid(cooking oil),to help developing criteria for determining falling film modes and their transitions,and to understand the heat transfer characteristics associated with each mode.

关键词： falling film flow mode cylinder

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Key theoretical and technical issues and countermeasures for effective development of Gulong shale oil, Daqing Oilfield, NE China

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Petroleum Exploration and Development 2023年第3期50卷 638-650页

作者： YUAN Shiyi LEI Zhengdong LI Junshi YAO Zhongwen LI Binhui WANG Rui LIU Yishan WANG Qingzhen CNPC Advisory Center Beijing 100724China PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China PetroChina Daging Oilfield Co. Ltd.Daging 163002China

Aiming at the four issues of underground storage state,exploitation mechanism,crude oil flow and efficient recovery,the key theoretical and technical issues and countermeasures for effective development of Gulong shale oil are put *** key exploration and research on fluid occurrence,fluid phase change,exploitation mechanism,oil start-up mechanism,flow regime/pattern,exploitation mode and enhanced oil recovery(EOR)of shale reservoirs with different storage spaces,multi-scale occurrence states of shale oil and phase behavior of fluid in nano confined space were provided,the multi-phase,multi-scale flow mode and production mechanism with hydraulic fracture-shale bedding fracture-matrix infiltration as the core was clarified,and a multi-scale flow mathematical model and recoverable reserves evaluation method were preliminarily *** feasibility of development mode with early energy replenishment and recovery factor of 3o%was *** on these,the researches of key theories and technologies for effective development of Gulong shale oil are proposed to focus on:(1)in-situ sampling and non-destructive testing of core and fluid;(2)high-temperature,high-pressure,nano-scale laboratory simulation experiment;(3)fusion of multi-scale multi-flow regime numerical simulation technology and large-scale application software;(4)waterless(CO_(2))fracturing technique and the fracturing technique for increasing the vertical fracture height;(5)early energy replenishment to enhance oil recovery;(6)lifecycle technical and economic ***,a series of exploitation tests should be performed on site as soon as possible to verify the theoretical understanding,optimize the exploitation mode,form supporting technologies,and provide a generalizable development model,thereby supporting and guiding the effective development and production of Gulong shale oil.

关键词： Gulong shale oil continental shale oil nano confined space production mechanism flow mode early energy replenishment enhanced oil recovery

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