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A novel experimental setup with sand trunk for heat extraction of geothermal heat exchanger

Journal of Harbin Institute of Technology(New Series) 2008年第6期15卷 809-813页

作者：姜益强姚杨陈益明马最良 School of Municipal and Environmental Engineering Harbin Institute of Technology Dept.of Building Service Engineering Hong Kong Polytechnic University

A novel experimental setup was developed to study the heat extraction of geothermal heat exchanger(GHE)in different operational modes under adiabatic and isothermal *** experimental setup consists of a sand trunk,a tailored water chiller,a natural cold source unit,two water boxes containing hot water and cool water,and a data acquisition *** experimental results indicate that the volume flow rate of the entering water is a main factor affecting the heat extraction;furthermore,the heat extraction value per meter pipe decreases gradually along the heat extraction pipe and increases with the increase of the incoming water volume flow ***,this novel experimental setup may be helpful to further study the operation performance of GHE in different types of soil.

关键词： heat extraction GHE experimental setup sand trunk

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Physical modeling into outflow hydrographs and breach characteristics of homogeneous earthfill dams failure due to overtopping

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Journal of Mountain Science 2021年第2期18卷 462-481页

作者： KOUZEHGAR Kamran HASSANZADEH Yousef ESLAMIAN Saeid YOUSEFZADEH FARD Mikaeil BABAEIAN AMINI Alireza Department of Civil Engineering Najafabad BranchIslamic Azad UniversityNajafabad ***Iran Department of Water Engineering Center of Excellence in HydroinformaticsFaculty of Civil EngineeringUniversity of TabrizTabriz ***Iran Department of Water Engineering Isfahan University of TechnologyIsfahan ***Iran Faculty of Civil Engineering University of TabrizTabriz ***Iran Faculty of Civil Engineering University of BonabBonab ***Iran

The main objective of the present study is to introduce new empirical equations for the determination of breach geometrical dimensions and peak outflow discharge(Q_(p)).Therefore,a historic failure database of 109 embankments was collected and *** most important factors that affect the breach evolution,including grading size,hydraulic,and outflow characteristics are also *** of the parameters used for the determination of Q_(p) and average breach width(Bave)have a significant effect on the erosion process,but they are less reflected in the technical *** study the behavior of noncohesive soils during overtopping,15 physical tests were performed at the laboratory,and the effects of interfering parameters were *** experimental output hydrograph was used to simulate the hydrographs resulting from the failure of real dams,and recent artificial intelligence techniques along with linear and nonlinear regression models were *** area-time analysis of the laboratory hydrographs shows that the soil particle size and the characteristics of reservoir-basin significantly affect the rate of breach formation and outflow *** relationships are introduced,based on the breach characteristics,by a combination of historical and experimental data,as well as case studies conducted on the hypothetical failure of 10 operational *** mathematical model is also used to simulate the process of breach *** on statistical indices,comparison of the results,and sensitivity analysis,the developed equations can better express the susceptibility of materials to erosion and their application can minimize downstream vulnerabilities.

关键词： Dam breach Peak outflow Output hydrograph Modeling Soft computing experimental setup

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UV Emission of Excimer XeCl Excited in Dielectric Barrier Discharge by using Pulse Power Supply

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Plasma Science and Technology 2001年第5期3卷 933-940页

作者：徐金州梁荣庆任兆杏 Institute of Plasma Physics the Chinese Academy of Sciences Hefei 230031 China

A dielectric barrier discharge experimental setup, which is convenient to vary the gas parameters of the mixture of xenon and chlorine, has been established and used to generate UV emission (308 nm). The influences of the partial pressure of chlorine and the total gas pressure on the UV emission under different electric parameters of pulse power supply have been studied preliminarily.

关键词： Pulse Power Supply dielectric barrier discharge UV emission pulse power supply experimental setup gas parameters gas pressure

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