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Influence of the water jet system vs cavitron ultrasonic surgical aspirator for liver resection on the remnant liver

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World Journal of Clinical Cases 2022年第20期10卷 6855-6864页

作者： Takehiko Hanaki Ayumi Tsuda Teppei Sunaguchi Keisuke Goto Masaki Morimoto Yuki Murakami Kyoichi Kihara Tomoyuki Matsunaga Manabu Yamamoto Naruo Tokuyasu Teruhisa Sakamoto Toshimichi Hasegawa Yoshiyuki Fujiwara Division of Gastrointestinal and Pediatric Surgery Department of SurgeryTottori University Faculty of MedicineYonago 683-8504TottoriJapan

BACKGROUND Several methods,such as finger fracture,Pean crush,cavitron ultrasonic surgical aspirator(CUSA),and water jet(WJ),are used for hepatic parenchymal dissection in liver *** is the conventional method in *** is a relatively novel method for parenchymal *** it has several advantages,such as lower volume of blood loss and shorter operative time,the effect of the WJ system for hepatic dissection on the remnant liver has not yet been *** To investigate and compare the effect of the WJ method vs CUSA on the remnant liver cut *** This observational study compared the two types of parenchymal transection methods(WJ vs CUSA)in liver *** total,24 and 40 patients who underwent hepatectomy using the WJ method and CUSA,respectively,were included in the ***,the clinicopathological characteristics and clinical outcomes of 24 and 40 patients were ***,postoperative contrast-enhanced computed tomography(CT)scan was performed to assess the cut surface length of the remnant liver and the degenerative thickness of the areas with a reduced contrast effect in the dissected ***,the two groups were *** On CT scan,the median areas of denaturation in the liver dissection planes were 522(range:109.5-1242)mm^(2) in the CUSA group and 324(range:93.6-1529)mm^(2) in the WJ *** area did not significantly differ between the two groups;however,the denaturation thickness of the WJ group was significantly lower than that of the CUSA group[5.8(range:0.7-11.1)mm vs 3.3(range:1.7-10.4)mm,P<0.001].CONCLUSION The WJ group had significantly thinner contrast-enhanced areas in the post hepatectomy detached section than the CUSA group.

关键词： water jet Cavitron ultrasonic surgical aspirator Energy device Hepatic parenchymal dissection Liver resection

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NUMERICAL SIMULATION OF ROCK BREAKING MECHANISM WITH HIGH-PRESSURE water jet

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Journal of Hydrodynamics 2004年第1期16卷 109-110页

作者： NIHong-jian WangRui-he ShenZhong-hou OuXin-yi GeHong-kui HanZhi-yong GuanZhi-chuan LiuTing-cheng YuWen-ping CollegeofPetroleumEngineering UniversityofPetroleum（EastChina）Dongying257061China UniversityofPetroleum（EastChina） UniversityofPetroleum（EastChina） Chairman DrillingTechnologyResearchInstitute ShenliOilfield UniversityofPetroleum（EastChina） BeijingUniversityofScienceandTechnology ChinaPetroleumandChemicalCorporation

Based on the analysis of experimental results, the rock damage model and thedamage coupling model suitable for the whole rock breaking process with water jet were establishedwith continuous damage mechanics and micro damage mechanics, and the numerical method was developedwith continuum mechanics and the FEM theory. The rock breaking mechanism with water jet was studiedsystematically with numerical simulation for the first time in the field of water-jet rock *** numerical results agree with the experimental ones which shows that the presented method isreasonable and can reflect the reality of water-jet rock breaking. The conclusion can be applied inpractice.

关键词： water jet rock fragment rock damage model FEM experimental study

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Experimental Study on Reaction Thrust Characteristics of water jet for Conical Nozzle

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China Ocean Engineering 2009年第4期23卷 669-678页

作者：黄国勤李晓辉朱玉泉聂松林 State Key Laboratory of Mechanical Transmission College of Mechanical EngineeringChongqing University School of Mechanical Science and Engineering Huazhong University of Science and Technology College of Mechanical Engineering and Applied Electronics Technology Beijing University of Technology

water jet thruster, which is a marine system that creates a jet of water for propulsion, has several advantages such as low noise, good anti-cavitation characteristics and maneuvering characteristics. The reaction thrust characteristics of water jet for conical nozzles directly determine the speed of autonomous underwater vehicles （AUV）. Theoretical, numerical and experimental studies have been, carried out to investigate the effects of the nozzle geometries as well as inlet conditions on the reaction thrust of water jet in this paper. The experimental results show that： 1） the reaction thrust is proportional to inlet pressure, the square of flow rate and 2/3 power exponent of input power; 2） the diameter of cylinder column for conical nozzle has great influence on the reaction thrust characteristics; 3） the best values of the half cone angle and the cylinder column length exist to make the reaction thrust coefficient to reach the maximum under the same inlet conditions. Those provide a basis for nozzles design and have significant value, especially for developing high performance and efficiency water jet propulsion unit.

关键词： conical nozzle reaction thrust thrust coefficient water jet

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Research and application of water jet technology in well completion and stimulation in China

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Petroleum Science 2010年第2期7卷 239-244页

作者： Li Gensheng Huang Zhongwei Tian Shouceng Shen Zhonghou State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing 102249 China

In recent years, rapid progress in the use of high pressure water jets （HPWJ） has been made in oil and gas well drilling, completion, and stimulation; and good results have been achieved in field applications. Advances in technologies and developments of well completion and stimulation with hydrajet are reviewed in this paper. Experiments were conducted to study the characteristics of abrasive water jetting and to optimize jet parameters, which can provide methods for the well completion and hydrajet fracturing. Deep-penetrating hydrajet perforating can create a 2-3 m clean hole with a diameter of 20-35 mm. Multilayer hydrajet fracturing is a process whereby multiple layers are stimulated in a single run without using mechanical packers, thereby reducing operation procedure and risk. Multilateral radial wells can be drilled using hydraulic jetting up to 100 m in length. The technique to remove sand particles and plugs with rotating self-resonating cavitating water jets in horizontal wellbores has been developed and oilfield-tested, which shows promising, cost effective prospects.

关键词： water jet abrasive jet well completion perforation stimulation horizontal drilling with hydrajet

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NUMERICAL SIMULATION STUDY ON ROCK BREAKING MECHANISM AND PROCESS UNDER HIGH PRESSURE water jet

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Applied Mathematics and Mechanics(English Edition) 2005年第12期26卷 1595-1604页

作者：倪红坚王瑞和张延庆 College of Petroleum Engineering China University of Petroleum (East China) College of Building Engineering Beijing University of Technology

The numerical simulation method to study rock breaking process and mechanism under high pressure water jet was developed with the continuous mechanics and the FEM theory. The rock damage model and the damage-coupling model suited to analyze the whole process of water jet breaking rock were established with continuum damage mechanics and micro damage mechanics. The numerical results show the dynamic response of rock under water jet and the evolvement of hydrodynamic characteristic of jet during rock breaking is close to reality, and indicates that the body of rock damage and breakage under the general continual jet occurs within several milliseconds, the main damage form is tensile damage caused by rock unload and jet impact, and the evolvement of rock damage shows a step-change trend. On the whole, the numerical results can agree with experimental conclusions, which manifest that the analytical method is feasible and can be applied to guide the research and application of jet breaking rock theory.

关键词： water jet rock breakage rock damage model fluid-wall interaction finite element method

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water jet Quenching Machine Slit Flow Field Simulation and Structure Optimization

Water Jet Quenching Machine Slit Flow Field Simulation and S...

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第十届中国钢铁年会暨第六届宝钢学术年会

作者： Wang Xuemin He Xiaoming Fan Qun Baoshan Iron & Steel Co. Ltd.

Heat treatment quenching machine is one of the key equipments for steel quenching and tempering treatment, whereas water spraying system is an important part of the quenching machine. High pressure outlet is designed to be a slit nozzle, also known as water jet. The water flow distribution uniformity for plate flatness is very critical. In this paper, by simulating analysis based on FLUENT software, the internal flow field distribution was obtained inside the quenching machine. By changing the internal structure of the slit jet, including the exit slit gap, outlet spray angle, flow hole quantity, nozzle length and web, the impact on outlet flow distribution was obtained. Results shows that slit gap, outlet spray angle and nozzle length don’t affect the outlet water flow distribution uniformity significantly, however, flow hole quantity have some degree of impact, whereas web has significant effect. The analysis of the result provides the theoretical reference for the design and optimization of the structure of the water jet.

关键词： quenching machine water jet structure design plate shape

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Experimental Study on the Effect of the Inclination Angle on the Scouring Efficiency of Submerged water jets

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Fluid Dynamics & Materials Processing 2022年第5期18卷 1363-1371页

作者： Zhibin Zhang Yongjun Gong Liping Zhang Min Xv Gaofeng Shang Dalian Maritime University Naval Architecture and Ocean Engineering CollegeDalian116026China Guangzhou Maritime University Guangzhou510725China Key Laboratory of Road Construction&Equipment of MOE Chang’an UniversityXi’an710064China Huiyong Holding Group Co. Ltd.Beijing100093China

The effects of oblique submerged scouring jets on sand beds with various particle sizes have been studied *** particular,a total of 25 experiments have been carried out to explore the influences of the jet angle and application time on the considered submerged sand *** results conducted with a specially-designed device have shown that the scouring efficiency attains a maximum when the inclination angle is in the range between 15°and 20°and then it decreases when the inclination angle becomes higher.

关键词： water jet scour angle of inclination scouring efficiency experimental study

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Progress in numerical simulation of cavitating water jets

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Journal of Hydrodynamics 2013年第4期25卷 502-509页

作者： PENG Guoyi SHIMIZU Seiji College of Engineering Nihon University

This paper reviews recent progress made toward modeling of cavitation and numerical simulation of cavitating water jets. Properties of existing cavitation models are discussed and a compressible mixture flow method for the numerical simulation of high- speed water jets accompanied by intensive cavitation is introduced. Two-phase fluids media of cavitating flow are treated as a homo- geneous bubbly mixture and the mean flow is computed by solving Reynolds-Averaged Navier-Stokes （RANS） equations for com- pressible fluid. The intensity of cavitation is evaluated by the gas volume fraction, which is governed by the compressibility of bubble-liquid mixture corresponding to the status of mean flow field. Numerical results of cavitating water jet issuing from an orifice nozzle are presented and its applicability to intensively cavitating jets is demonstrated. However, the effect of impact pressure caused by collapsing of bubbles is neglected, and effectively coupling of the present compressible mixture flow method with the dynamics of bubbles remains to be a challenge.

关键词： cavitation water jet multi-phase flow numerical simulation

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Mechanism and numerical simulation of pressure stagnation during water jetting perforation

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Petroleum Science 2008年第1期5卷 52-55页

作者： Huang Zhongwei Li Gensheng Tian Shouceng Shen Zhonghou Luo Hongbin Key Laboratory of Petroleum Engineering Ministry of Education China University of Petroleum Beijing 102249 China

When perforating with an abrasive water jet, it is possible that the pressure in the hole （perforation） will be higher than that in the annulus because of water jet blasting against the hole wall, which also is the theoretical basis for the technology of hydro-jet fracturing. This paper analyzes the mechanism of generating pressure stagnation in water jet hole, and puts forward a new concept of hydroseal. Then, the distribution of pressure in the hole was simulated with the finite element method. The simulation results showed that the pressure in the hole was higher than that in the annulus. Also, the lower the annular pressure （confining pressure） and the higher the blasting pressure, the greater the pressure difference. An experiment indicated that the cement sample was lifted up under the pressure stagnation in the hole, which proved the finite element simulation results obviously.

关键词： water jet perforation pressure stagnation hydro-seal mechanism

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Flow field simulation of supercritical carbon dioxide jet: Comparison and sensitivity analysis

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Journal of Hydrodynamics 2015年第2期27卷 210-215页

作者：王海柱李根生田守嶒程宇雄贺振国于水杰 State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum (Beijing) Sinopec International Petroleum Exploration and Production Corporation

As a new jet technology developed in recent years, the supercritical carbon dioxide（SC-CO2） jet technology enjoys many advantages when applied in oil and gas explorations. In order to study the properties and parametric influences of the SC-CO2 jet, the flow fields of the SC-CO2 jet are simulated using the computational fluid dynamics method. The flow field of the SC-CO2 is compared with that of the water jet. The influences of several parameters on the flow field of the SC-CO2 jet are studied. It is indicated that like the water jet, the velocity and the pressure of the SC-CO2 jet could be converted to each other, and the SC-CO2 jet can generate a significant impact pressure on the wall, the SC-CO2 jet has a stronger impact pressure and a higher velocity than those of the water jet under the same conditions, the maximum velocity and the impact pressure of the SC-CO2 jet increase with the increase of the nozzle pressure drop, under the stimulation condition of this study, the influence of the SC-CO2 temperature on the impact pressure can be neglected in engineering applications, while the maximum velocity of the SC-CO2 jet increases with the increase of the fluid temperature. This paper theoretically explores the properties of the SC-CO2 jet flow field, and the results might provide a theoretical basis for the application of the SC-CO2 jet in oil and gas well drillings and fracturing stimulations.

关键词： supercritical carbon dioxide water jet confining pressure flow field drilling

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