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High reynolds gas-liquid two phase flow around a triangular body 12

ASME 2014 12th Biennial Conference on Engineering systems design and Analysis, ESDA 2014

作者： Hanafizadeh, Pedram Hojati, S. Alireza Eslami, Hamid Latifian, Navid Center of Excellence in Design and Optimization of Energy Systems College of Engineering University of Tehran Tehran Iran

ISBN: (纸本)9780791845844

In many industrial applications, some measurement instruments must be placed in a pipe in which fluid flows. Two phase cross flows around a body have seldom been studied until now and considering these flows can play a significant role in long-term reliability and safety of industrial systems. In this paper drag coefficient, pressure coefficient and void fraction around triangular bodies with different leading edge angles were considered. Also effect of Reynolds number and inlet void fraction on drag coefficient and pressure coefficient has been investigated and flow treatment behind the triangular obstacle has been examined. To achieve this aim, main equations of flow have been developed for investigation of drag coefficient in air-water two phase. Our numerical analyses were performed by a designed and written CFD package which is based on Eulerian-Eulerian approach. Geometries, which have been studied in this article, are triangle, with different leading edge angle. Other parameters such as two phase Reynolds number, free stream void fraction and bubble size were considered, too. Drag coefficient is closely relates to the turbulence and the bubble motion. Since these mechanisms vary over time, we used final value of drag coefficient after convergence. The results showed that drag coefficient is strongly depended of Reynolds number. In this simulation it can be seen that both the drag coefficient and pressure drag coefficient decrease whit increase in two phase Reynolds number and increase with decrease in inlet void fraction. Copyright © 2014 by ASME.

关键词： Void fraction

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Effect of inclination pipe angle on oil-water two phase flow patterns and pressure loss 12

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ASME 2014 12th Biennial Conference on Engineering systems design and Analysis, ESDA 2014

作者： Hojati, S.Alireza Hanafizadeh, Pedram Center of Excellence in Design and Optimization of Energy Systems College of Engineering University of Tehran Tehran Iran

ISBN: (纸本)9780791845844

The flow patterns in two phase and multi-phase flows is a significant factor which influences many other parameters such as drag force, drag coefficient and pressure drop in pipe lines. One of the major streams in the gas and oil industries is oilwater two phase flow. The main flow patterns in oil-water flows are bubbly, slug, dual continuous, stratified and annular. In the present work flow patterns in two phase oil-water flow were investigated in a 0.5in diameter pipe with length of 2m. 3D simulation was used for this pipe and six types of mesh grid were used to investigate mesh independency of the simulation. The proposed numerical analyses were performed by a CFD package which is based both on volume of fluid (VOF) and Eulerian-Eulerian methods. The results showed that some flow patterns can be simulated better with VOF method and some other maybe in Eulerian-Eulerian method, so these two methods were compared with together for all flow patterns. The flow patterns may be a function of many parameters in flow. One of the important parameter which may affect flow patterns in pipe line is pipe inclination angle;therefore flow patterns in the different pipe inclination angles were investigated in two phase oil-water flow. The range of inclinations has been varied between -45 to +45 degree about the horizon. In the presented simulation oil is mixed with water via a circular hole at center of the pipe, the ratio of oil surface to water surface at entrance is 2/3 so water phase was considered as the main phase. Flow patterns were investigated for every angle of pipe and numerical results were compared with available experimental data for verification. Also the flow patterns simulated by numerical approaches were compared with available flow regime maps in the previous literatures. Finally, effect of pipe inclination angle and flow patterns on the pressure loss were investigated comprehensively. Copyright © 2014 by ASME.

关键词： Flow patterns

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Publisher Correction: The Scales Project, a cross-national dataset on the interpretation of thermal perception scales

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Scientific data 2020年第1期7卷 11页

作者： Marcel Schweiker Amar Abdul-Zahra Maíra André Farah Al-Atrash Hanan Al-Khatri Rea Risky Alprianti Hayder Alsaad Rucha Amin Eleni Ampatzi Alpha Yacob Arsano Montazami Azadeh Elie Azar Bannazadeh Bahareh Amina Batagarawa Susanne Becker Carolina Buonocore Bin Cao Joon-Ho Choi Chungyoon Chun Hein Daanen Siti Aisyah Damiati Lyrian Daniel Renata De Vecchi Shivraj Dhaka Samuel Domínguez-Amarillo Edyta Dudkiewicz Lakshmi Prabha Edappilly Jesica Fernández-Agüera Mireille Folkerts Arjan Frijns Gabriel Gaona Vishal Garg Stephanie Gauthier Shahla Ghaffari Jabbari Djamila Harimi Runa T Hellwig Gesche M Huebner Quan Jin Mina Jowkar Renate Kania Jungsoo Kim Nelson King Boris Kingma M Donny Koerniawan Jakub Kolarik Shailendra Kumar Alison Kwok Roberto Lamberts Marta Laska M C Jeffrey Lee Yoonhee Lee Vanessa Lindermayr Mohammadbagher Mahaki Udochukwu Marcel-Okafor Laura Marín-Restrepo Anna Marquardsen Francesco Martellotta Jyotirmay Mathur Gráinne McGill Isabel Mino-Rodriguez Di Mou Bassam Moujalled Mia Nakajima Edward Ng Marcellinus Okafor Mark Olweny Wanlu Ouyang Ana Ligia Papst de Abreu Alexis Pérez-Fargallo Indrika Rajapaksha Greici Ramos Saif Rashid Christoph F Reinhart Ma Isabel Rivera Mazyar Salmanzadeh Karin Schakib-Ekbatan Stefano Schiavon Salman Shooshtarian Masanori Shukuya Veronica Soebarto Mohammad Tahsildoost Federico Tartarini Despoina Teli Priyam Tewari Samar Thapa Maureen Trebilcock Jörg Trojan Ruqayyatu B Tukur Conrad Voelker Yeung Yam Liu Yang Gabriela Zapata-Lancaster Yongchao Zhai Yingxin Zhu Zahra Sadat Zomorodian Building Science Group Karlsruhe Institute of Technology Englerstr. 7 76131 Karlsruhe Germany. marcel.schweiker@kit.edu. WIN-Kolleg Thermal comfort and pain Heidelberg Academy of Sciences and Humanities Karlstr. 4 69117 Heidelberg Germany. marcel.schweiker@kit.edu. Mechanical Engineering Department University of Technology Iraq Al sinaea 10066 Baghdad Iraq. CTC/Department of Civil Engineering Federal University of Santa Catarina Rua João Pio Duarte Silva s/n. Córrego Grande 88.040-901 Florianópolis SC Brazil. School of Architecture and Built Environment German Jordanian University Darat Othman Bdeir 11180 Amman Jordan. Civil and Architectural Engineering Department Sultan Qaboos University Al-Khod P.O. Box: 33 PC: 123 Muscat Oman. Laboratory of Building Technology Department of Architecture Institut Teknologi Bandung Ganesha 10 40132 Bandung Indonesia. Department of Building Physics Bauhaus-University Weimar Coudraystr. 11A 99423 Weimar Germany. Energy & Climate Change Group Faculty of Engineering & Physical Sciences University of Southampton University Road SO17 1BJ Southampton United Kingdom. Welsh School of Architecture Cardiff University King Edward VII Avenue CF10 3NB Cardiff United Kingdom. Department of Architecture Massachusetts Institute of Technology Massachusetts Ave 02139 Cambridge United States of America. Faculty of Engineering Environment and Computing BNE Research Centre Coventry University Gulson road CV1 2JH Coventry United Kingdom. Industrial and Systems Engineering Khalifa University Masdar Campus Building 1B 54224 Abu Dhabi United Arab Emirates. Architecture University of Tehran Kish International Campus Niyayesh St. Mirmohanna Blvd 79416-55665 Kish Iran. Department of Architecture Ahmadu Bello University Zaria Nigeria Samaru Zaria Nigeria. WIN-Kolleg Thermal comfort and pain Heidelberg Academy of Sciences and Humanities Karlstr. 4 69117 Heidelberg Germany. Department of Cognitive and Clinical Neurosci

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

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Void fraction and wake analysis of a gas-liquid two-phase cross-flow

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Multiphase Science and Technology 2014年第4期26卷 261-286页

作者： Hanafizadeh, P. Momenifar, M. Geimassi, A. Nouri Ghanbarzadeh, S. Center of Excellence in Design and Optimization of Energy Systems School of Mechanical Engineering College of Engineering University of Tehran Iran Department of Mechanical Engineering and Material Science University of Pittsburgh PittsburghPA15261 United States Department of Petroleum and Geosystems Engineering University of Texas at Austin AustinTX78712 United States

Two-phase cross-flow takes place in a wide range of industrial equipment, including heat exchangers and measurement devices. The aim of this paper is to establish a numerical model and experimental methodology for comprehensive study and visualization of void fraction and wake region in gas-liquid cross-flow over immersed bodies with various cross-section geometries. Conservation of mass and momentum for both-phase free streams, along with constitutive relationships, were used for modeling turbulence. The input parameters for the numerical simulations were two-phase Reynolds number, free-stream void fraction, bubble size in the inlet, and cross-section geometry of prisms inserted in the two-phase flow path. Because the wake region and phase distribution around an immersed object are time-dependent, we report time average values of drag, lift, and pressure coefficients. The results show that drag and lift coefficients are strongly dependent on the two-phase Reynolds number;this dependency is a more moderate function of void fraction. The results are in good agreement with available empirical correlations and experimental work. Furthermore, experiments were conducted to visualize phase distribution and wake region in two-phase cross-flow. Comparison of the experimental and numerical results verifies the developed numerical model. © 2014 by Begell House, Inc.

关键词： Void fraction

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Corrigendum to “Identification of two-phase water–air flow patterns in a vertical pipe using fuzzy logic and genetic algorithm” [Appl Thermal Eng 85 (2015) 195–206]

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Applied Thermal Engineering 2015年 90卷 683-683页

作者： Pedram Hanafizadeh S.M. Pouryoussefi Milad Fathpour Yuwen Zhang Center of Excellence in Design and Optimization of Energy Systems (CEDOES) School of Mechanical Engineering College of Engineering University of Tehran P.O. Box: 11155-4563 Tehran Iran Department of Mechanical and Aerospace Engineering University of Missouri Columbia MO 65211 USA

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Modeling and electrical optimization of a designed Piezoelectric-based vibration energy Harvesting System

Modeling and electrical optimization of a designed Piezoelec...

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RSI/ISM International Conference on Robotics and Mechatronics (ICROM)

作者： Navid Mohajer M.J. Mahjoob Center of Excellence in Design and Optimization of Energy Systems (CEDOES) School of Mechanical Engineering College of Engineering University of Tehran Iran

Among various strategies for energy harvesting in micro and meso-scale, Piezoelectric energy Harvesting System (PEHS) brought about an ideal prospect of green source of energy to power electrical devices at low driving voltage. As it is expected, Micro Electro-Mechanical systems (MEMS) and Wireless Sensor Nodes (WSN) are considered as substantial applications of PEHS in diverse fields such as biomedical, vehicles and security system. However like most of mechatronics systems a PEHS can be optimized mechanically and electrically to achieve more electrical power besides adaptive performance regardless of ambient vibration variation. Considering electrical standpoint instead of mechanical concern, in this paper after a glance at analysis and modeling of a designed PEHS an electrical optimization in interface circuit will be examined and tested. Using off the shelf components and a relatively simple structure of this optimized and self-powered interface circuit substituted for Standard energy Harvesting Circuit (SEHC) are the striking features of this scheme.

关键词： Standards

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Review study on airlift pumping systems

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Multiphase Science and Technology 2012年第4期24卷 323-362页

作者： Hanafizadeh, P. Ghorbani, B. Center of Excellence in Design and Optimization of Energy Systems School of Mechanical Engineering College of Engineering University of Tehran P.O. Box: 11155-4563 Tehran Iran

Airlift systems are widely used in various fields such as in the petrochemical and oil industries. Because the main part of the flow through the pipe of these systems is formed by gas-liquid two-phase flow, analysis of such systems are accompanied with problems of two-phase flow modeling. Several effective variables are involved in airlift systems;therefore, a comprehensive method is needed when considering these parameters. This paper reviews the state of the art in the field of airlift systems. All of the related articles have been divided into two categories;namely, two-phase and three-phase systems based on the operation of the airlift systems in the fluids. Moreover, the paper describes the airlift pump operation as a kind of pumping system and evaluates developments in the modeling of these systems. In particular, the paper also concentrates on airlift history and background, structure, types, and applications. © 2012 by Begell House, Inc.

关键词： Pumps

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RF MEMS DMTL phase shifter on low-resistivity silicon for Ku band with reduced substrate loss

RF MEMS DMTL phase shifter on low-resistivity silicon for Ku...

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IEEE Region 10 International Conference TENCON

作者： Avra Kundu Bhaskar Gupta Hiranmay Saha Binay K. Sarkar Samir K. Lahiri IC Design and Fabrication Center Department of Electronics and Telecommunication Engineering Jadavpur University Kolkata West Bengal India Centre of Excellence for Green Energy and Sensor Systems Bengal Engineering and Science University Howrah West Bengal India Electronics & EC Engineering Indian Institute of Technology Kharagpur Kharagpur West Bengal India Advanced Technology Development Center Sponsored Research and Industrial Consultancy Indian Institute of Technology Kharagpur Kharagpur West Bengal India

Distributed MEMS transmission line (DMTL) phase shifter on low resistivity silicon for Ku band is presented. The loss relating to the conductivity of silicon and carriers at the silicon-oxide interface is solved by completely removing the silicon as well as the oxide from underneath the CPW t-line. The only silicon left is to provide anchorage to movable sections of the CPW. This also results in a two movable plate system which simultaneously improves the actuation voltage and the switching speed. A phase shifter based on the two movable plate system is designed and a phase shift of 180° is obtained at Ku band with an insertion loss of 1.16dB for low resistivity silicon (10-20 Ωcm). A fabrication technique is proposed and initial fabrication results of the design are presented.

关键词： Silicon Substrates Coplanar waveguides Biomembranes Conductivity Micromechanical devices Phase shifters

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Application of high temperature superconducting wire to magnetostrictive transducers for underwater sonar

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NAVAL ENGINEERS JOURNAL 1997年第1期109卷 31-39页

作者： Joshi, CH Lindberg, JF Clark, AE Dr. Chad H. Joshi:is president of Energen Incorporated an engineering and development firm specializing in cryogenic and electromechanical systems. The research presented here was conducted while he was employed at American Superconductor Coporation where he held both technical and program management positions. While there Dr. Joshi managed the development of several demonstration products including the sonar transducer presented here. He holds M.S. and Sc.D. degreesfrom the Massachusetts Institute of Technology and a B.S. degree from the Worcester Polytechnic Institute. He has worked in several diverse fields including solar energy fluidized bed technology and superconductivity. His work on stochastic analysis of solar insolation was recognized by the ASME and his doctoral research was accorded international recognition for its unique contribution to understanding quenching in superconducting magnets. Dr. Joshi has numerous patents and more than thirty-five technical publications to his credit. He is a registered Professional Engineer in Massachusetts and an active member of ASME and IEEE. He is a co-founder and treasurer of the New England Chapter of the Cryogenics Society of America. He will be listed in Whos Who in the East in 1997. Jan Lindberg:is a physicist in the Transducers and Arrays Division of the Naval Undersea Warfare Center in New London Connecticut. He leads NUWC'S exploratory development efforts for transduction science and currently is spearheading an effort to introduce high-energy density active materials into tactical sonar systems. With the discovery of high temperature superconductivity he saw the potential benefit of integrating several emerging technologies and enticed American Superconductor Corp. to develop a high temperature superconducting transducer which resulted in the March 1993 demonstration of the world's first integrated high temperature superconducting device. Mr. Lindberg's current interests involve design of high power ultrasonic copolymer arrays characterization of

A low-frequency underwater acoustic transducer integrating high-temperature superconducting (HTS) coils and terbium-dysprosium (TbDy) magnetostrictive material was designed, fabricated and tested. This represents a novel application for high-temperature superconductivity and is a first example of an integrated system involving HTS coils cooled by a mechanical cryocooler. It also brings HTS technology together with a novel magnetic materials technology. The I-ITS coils were fabricated using react-and-wind BiSrCaCuO-2223 HTS wires. They produce a peak field of 0.1 Tesla at 50 K. A single-stage, Stirling-cycle cryocooler was used to cool the coils and the TbDy driver to cryogenic temperatures (50-65K). The coils provide an AC magnetic field superimposed on a DC bias field, which produces oscillatory strain within the magnetostrictive rod;this motion is transmitted through a cryostat to two head masses which project sound into the surrounding environment. High power acoustic output can be obtained by operating the transducer at its resonance frequencies of 520 Hz in air and 430 Hz underwater. This development demonstrates that, unlike low temperature superconductors, HTS wires can be considered for AC applications due to the low losses in these superconductors and the higher heat capacities of materials at temperatures above liquid helium.

关键词： Underwater equipment

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