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Numerical and experimental modelling of Gas Flow and Heat Transfer in the Air Gap of an Electric Machine. Part II: Grooved Surfaces

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Journal of Thermal Science 2005年第1期14卷 48-55页

作者： Maunu KUOSA Petri SALLINEN Arttu REUNANEN Jari BACKMAN Jaakko LARJOLA Lasse KOSKELAINEN Lappeenranta University of Technology Department of Energy and Environmental Technology P.O.Box 2053851 LappeenrantaFinland

The study deals with the cooling of a high-speed electric machine through an air gap with numerical and experimental *** rotation speed of the test machine is between 5000-4000 r/rain and the machine is cooled by a forced gas flow through the air *** the previous part of the research the friction coefficient was measured for smooth and grooved stator cases with a smooth *** heat transfer coefficient was recently calculated by a numerical method and measured for a smooth stator-rotor *** this report the cases with axial groove slots at the stator and/or rotor surfaces are *** flow simulations and measurements have been done for the test machine dimensions at a large velocity *** constant mass flow rate the heat transfer coefficients by the numerical method attain bigger values with groove slots on the stator or rotor *** results by the numerical method have been confirmed with *** RdF-sensor was glued to the stator and rotor surfaces to measure the heat flux through the surface,as well as the temperature.

关键词： electric machine air gap groove slot heat transfer computational fluid dynamics experimental modelling high-speed technology.

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Using experimental designs for modelling of intermittent air filtration process

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Frontiers of Electrical and Electronic Engineering in China 2008年第2期3卷 218-222页

作者： A.TILMATINE M.BRAHAMI F.MILOUA R.GOURI L.DASCALESCU Electrostatics and High Voltage Research Unit IRECOM Labora-toryUniversity of Sidi-Bel-AbbesFaculty of EngineeringAlgeria University Institute of Technology AngouleˆmeUniversity of PoitiersFrance

Identification of the optimal operating conditions and evaluation of their robustness are critical issues for industrial processes.A standard procedure,for modelling a laboratory-scale wire-to-cylinder electrostatic precipitator and for guiding the research of the set point,is *** procedure consists of formulating a set of recommendations regarding the choice of parameter values for electrostatic *** experiments were carried out on a laboratory cylindrical precipitator,built by one of the authors,with samples of wood *** parameters considered are the applied high voltage U,the air flow F,and the quantity of dust in air ***"one-factor-at-a-time"followed by factorial composite design experiments were performed,based on the following three-step strategy:1)Identify the domain of variation of the variables;2)Determine the mathematical model of the process outcome;3)Validation of the math-ematical model and optimisation of the process.

关键词： design of experiments electrostatic precip-itator experimental modelling high voltage

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experimental and numerical analysis of multi-chamber oscillating water column devices

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Journal of Hydrodynamics 2024年第3期36卷 492-503页

作者： Jorge Gadelho Kourosh Rezanejad C.Guedes Soares Centre for Marine Technology and Ocean Engineering(CENTEC) Instituto Superior TécnicoUniversidade de LisboaAvenida Rovisco PaisLisboaPortugal

A review of multi-chamber oscillating water column(OWC)device designs is *** significant variations of these devices are discussed,onshore OWC(OOWC)and a floating OWC(FOWC).The efficiency results of several theoretical studies based on low-and high-fidelity numerical models are presented and compared with the model scale ***,low-fidelity numerical models are very fast to run,but their accuracy is limited compared with high-fidelity numerical *** model experiments usually give results much more accurate than numerical models,but they need adequate facilities and are very *** the case of the OOWC,all models show a similar trend of total efficiency,but while the analytical model shows a maximum value of around 90%efficiency,the CFD model shows 60%,and the experiments only go up to 40%.The main reason is connected with the mathematical simplifications and assumptions that do not represent all the hydrodynamic and aerodynamic processes between the water,air,and *** the case of the FOWC,interestingly,the experimental results show a maximum efficiency of almost 100%,while the analytical model only predicts a maximum of 80%.The efficiency seems highly dependent on the heave motion resonance of the entire device,where the analytical model fails to predict this natural frequency.

关键词： Wave energy converters oscillating water column(OWC) multi-chambers experimental modelling numerical modelling

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Zn metabolism of monogastric species and consequences for the definition of feeding requirements and the estimation of feed Zn bioavailability

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2019年第8期20卷 617-627页

作者： Daniel BRUGGER Wilhelm M.WINDISCH Chair of Animal Nutrition TUM School of Life Sciences Weihenstephan Technical University of Munich

A major goal of mineral nutrition research is to provide information of feed zinc (Zn) utilization efficiency and gross Zn requirements as affected by changing rearing conditions. This can be achieved only by applying precise experimental models that acknowledge the basic principles of Zn metabolism. This review article summarizes the most important aspects of Zn homeostasis in monogastric species, including molecular aspects of Zn acquisition and excretion. Special emphasis is given to the role of the skeleton as well as the exocrine pancreas for animal Zn metabolism. Finally, we discuss consequences arising from these physiological principles for the experimental design of trials which aim to address questions of Zn requirements and bioavailability.

关键词： Monogastric species Zinc metabolism Requirement Bioavailability experimental modelling

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