Relevant bibliographies by topics / Capacitive flow

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  3. Books
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Academic literature on the topic 'Capacitive flow'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Capacitive flow"

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Liao, Jingsheng, John K.-J. Li, Xiaoming Guan, and Joseph Kedem. "Epicardial Coronary Capacitive Blood Flow." Cardiovascular Engineering 5, no. 3 (September 2005): 119–25. http://dx.doi.org/10.1007/s10558-005-7672-2.

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Wissman, James P., Kaushik Sampath, Simon E. Freeman, and Charles A. Rohde. "Capacitive Bio-Inspired Flow Sensing Cupula." Sensors 19, no. 11 (June 11, 2019): 2639. http://dx.doi.org/10.3390/s19112639.

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Submersible robotics have improved in efficiency and versatility by incorporating features found in aquatic life, ranging from thunniform kinematics to shark skin textures. To fully realize these benefits, sensor systems must be incorporated to aid in object detection and navigation through complex flows. Again, inspiration can be taken from biology, drawing on the lateral line sensor systems and neuromast structures found on fish. To maintain a truly soft-bodied robot, a man-made flow sensor must be developed that is entirely complaint, introducing no rigidity to the artificial “skin.” We present a capacitive cupula inspired by superficial neuromasts. Fabricated via lost wax methods and vacuum injection, our 5 mm tall device exhibits a sensitivity of 0.5 pF/mm (capacitance versus tip deflection) and consists of room temperature liquid metal plates embedded in a soft silicone body. In contrast to existing capacitive examples, our sensor incorporates the transducers into the cupula itself rather than at its base. We present a kinematic theory and energy-based approach to approximate capacitance versus flow, resulting in equations that are verified with a combination of experiments and COMSOL simulations.
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Wang, Miao, Shujin Hou, Yong Liu, Xingtao Xu, Ting Lu, Ran Zhao, and Likun Pan. "Capacitive neutralization deionization with flow electrodes." Electrochimica Acta 216 (October 2016): 211–18. http://dx.doi.org/10.1016/j.electacta.2016.09.026.

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Suss, Matthew E., Theodore F. Baumann, William L. Bourcier, Christopher M. Spadaccini, Klint A. Rose, Juan G. Santiago, and Michael Stadermann. "Capacitive desalination with flow-through electrodes." Energy & Environmental Science 5, no. 11 (2012): 9511. http://dx.doi.org/10.1039/c2ee21498a.

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Bonilla Riaño, Adriana, Antonio Carlos Bannwart, and Oscar M. H. Rodriguez. "Film thickness planar sensor in oil-water flow: prospective study." Sensor Review 35, no. 2 (March 16, 2015): 200–209. http://dx.doi.org/10.1108/sr-09-2014-702.

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Purpose – The purpose of this paper is to study a multiphase-flow instrumentation for film thickness measurement, especially impedance-based, not only for gas–liquid flow but also for mixtures of immiscible and more viscous substances such as oil and water. Conductance and capacitive planar sensors were compared to select the most suitable option for oil – water dispersed flow. Design/methodology/approach – A study of techniques for measurement of film thickness in oil – water pipe flow is presented. In the first part, some measurement techniques used for the investigation of multiphase flows are described, with their advantages and disadvantages. Next, examinations of conductive and capacitive techniques with planar sensors are presented. Findings – Film thickness measurement techniques for oil–water flow are scanty in the literature. Some techniques have been used in studies of annular flow (gas–liquid and liquid–liquid flows), but applications in other flow patterns were not encountered. The methods based on conductive or capacitive measurements and planar sensor are promising solutions for measuring time-averaged film thicknesses in oil–water flows. A capacitive system may be more appropriate for oil–water flows. Originality/value – This paper provides a review of film thickness measurements in pipes. There are many reviews on gas – liquid flow measurement but not many about liquid – liquid flow.
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Folaranmi, Gbenro, Mikhael Bechelany, Philippe Sistat, Marc Cretin, and Francois Zaviska. "Towards Electrochemical Water Desalination Techniques: A Review on Capacitive Deionization, Membrane Capacitive Deionization and Flow Capacitive Deionization." Membranes 10, no. 5 (May 12, 2020): 96. http://dx.doi.org/10.3390/membranes10050096.

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Electrochemical water desalination has been a major research area since the 1960s with the development of capacitive deionization technique. For the latter, its modus operandi lies in temporary salt ion adsorption when a simple potential difference (1.0–1.4 V) of about 1.2 V is supplied to the system to temporarily create an electric field that drives the ions to their different polarized poles and subsequently desorb these solvated ions when potential is switched off. Capacitive deionization targets/extracts the solutes instead of the solvent and thus consumes less energy and is highly effective for brackish water. This paper reviews Capacitive Deionization (mechanism of operation, sustainability, optimization processes, and shortcomings) with extension to its counterparts (Membrane Capacitive Deionization and Flow Capacitive Deionization).
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Porada, S., D. Weingarth, H. V. M. Hamelers, M. Bryjak, V. Presser, and P. M. Biesheuvel. "Carbon flow electrodes for continuous operation of capacitive deionization and capacitive mixing energy generation." Journal of Materials Chemistry A 2, no. 24 (2014): 9313. http://dx.doi.org/10.1039/c4ta01783h.

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Remillard, E. Marielle, Amit N. Shocron, John Rahill, Matthew E. Suss, and Chad D. Vecitis. "A direct comparison of flow-by and flow-through capacitive deionization." Desalination 444 (October 2018): 169–77. http://dx.doi.org/10.1016/j.desal.2018.01.018.

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Tasnim, Rumana, Sheroz Khan, Atika Arshad, and Molla Rashied Hussein. "Non-Contact Capacitive Technique for Biomass Flow Sensing." Indonesian Journal of Electrical Engineering and Computer Science 11, no. 2 (August 1, 2018): 531. http://dx.doi.org/10.11591/ijeecs.v11.i2.pp531-541.

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To facilitate real-time flow measurement, this paper aims to realize biomass flow sensing through electronic non-contact capacitive means. Hardware implementation has been carried out using a modified OP-AMP-based bridge circuit, with one arm made of a standard capacitance while the other arm is made from two specifically designed capacitive electrodes fitted on a piping system sensing biomass flow. The experimental results are targeted to obtain data for given biomass types through a custom-developed biomass flow piping system. Several flow affecting parameters namely: electrodes’ shapes, the location of electrodes on the piping system, biomass material type, and particle size have been considered in obtaining experimental data. Also, the circuit has been simulated to analyze flow sensing behavior for the proposed technique by evaluating the measurement data and assessing conformity between experimentally obtained and simulated data.
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Tang, Kexin, Sotira Yiacoumi, Yuping Li, Jorge Gabitto, and Costas Tsouris. "Optimal conditions for efficient flow-electrode capacitive deionization." Separation and Purification Technology 240 (June 2020): 116626. http://dx.doi.org/10.1016/j.seppur.2020.116626.

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Dissertations / Theses on the topic "Capacitive flow"

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Rommerskirchen, Alexandra Klara Elisabeth [Verfasser], Matthias [Akademischer Betreuer] Wessling, and Matthias [Akademischer Betreuer] Franzreb. "Continuous flow-electrode capacitive deionization / Alexandra Klara Elisabeth Rommerskirchen ; Matthias Wessling, Matthias Franzreb." Aachen : Universitätsbibliothek der RWTH Aachen, 2020. http://d-nb.info/1231911719/34.

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McLean, Jeffrey John. "Interdigital Capacitive Micromachined Ultrasonic Transducers for Microfluidic Applications." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/7625.

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The goal of this research was to develop acoustic sensors and actuators for microfluidic applications. To this end, capacitive micromachined ultrasonic transducers (cMUTs) were developed which generate guided acoustic waves in fluid half-spaces and microchannels. An interdigital transducer structure and a phased excitation scheme were used to selectively excite guided acoustic modes which propagate in a single lateral direction. Analytical models were developed to predict the geometric dispersion of the acoustic modes and to determine the sensitivity of the modes to changes in material and geometric parameters. Coupled field finite element models were also developed to predict the effect of membrane spacing and phasing on mode generation and directionality. After designing the transducers, a surface micromachining process was developed which has a low processing temperature of 250C and has the potential for monolithically integrating cMUTs with CMOS electronics. The fabrication process makes extensive use of PECVD silicon nitride depositions for membrane formation and sealing. The fabricated interdigital cMUTs were placed in microfluidic channels and demonstrated to sense changes in fluid sound speed and flow rate using Scholte waves and other guided acoustic modes. The minimum detectable change in sound speed was 0.25m/s, and the minimum detectable change in flow rate was 1mL/min. The unique nature of the Scholte wave allowed for the measurement of fluid properties of a semi-infinite fluid using two transducers on a single substrate. Changes in water temperature, and thus sound speed, were measured and the minimum detectable change in temperature was found to be 0.1C. For fluid pumping, interdigital cMUTs were integrated into microchannels and excited with phase-shifted, continuous wave signals. Highly directional guided waves were generated which in turn generated acoustic streaming forces in the fluid. The acoustic streaming forces caused the fluid to be pumped in a single, electronically-controlled direction. For a power consumption of 43mW, a flow rate of 410nL/min was generated against a pressure of 3.4Pa; the thermodynamic efficiency was approximately 5x10-8%. Although the efficiency and pressure head are low, these transducers can be useful for precisely manipulating small amounts of fluid around microfluidic networks.
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Almeida, Israel Frank dos Santos. "Estudo prospectivo de sonda capacitiva não intrusiva duplo-sensor para medir fração volumétrica in situ em escoamentos contendo água, óleo e ar." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/18/18135/tde-13022007-155630/.

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Sensores capacitivos são amplamente utilizados em vários sistemas de medida, tanto na indústria como em laboratórios de pesquisa. Estes dispositivos medem variadas grandezas físicas, como deslocamento, força, pressão, densidade e concentração de substâncias em escoamentos bifásicos, entre outros. Sua aplicação vêm sendo utilizada há algum tempo de forma relativamente elementar, necessitando ainda de estudos específicos para entender a fundo o fenômeno de transferência de carga. A sonda proposta neste trabalho visa melhorar a aquisição do sinal capacitivo e obter uma medida precisa de fração volumétrica em condições bifásicas e trifásicas. Portanto, é necessário um circuito transdutor que transmita de forma precisa a capacitância registrada entre os eletrodos dos sensores até uma central de aquisição. Neste trabalho buscamos desenvolver um modelo de sonda para medir frações volumétricas in situ. Para tanto, apresentamos as etapas de calibração dos sensores, através de válvulas de fechamento rápido, e validamos a técnica sob determinadas condições e variados padrões de escoamento. Dois sensores de geometrias distintas (anéis e hélices) foram utilizados na composição da sonda capacitiva não intrusiva. Propõe-se a solução do sistema linear para medição direta de fração volumétrica em escoamento trifásico.
Capacitive sensors are widely employed in many measurement systems in both industry and laboratory activities. These devices measure several physical quantities such as displacement, forces, pressure, density and concentration of substances in two-phase flows. Their application in industry is still insipient, in part because specific studies are still necessary to properly understand the phenomenon of charge transfer. The goal of this research is the development of a non-intrusive double-sensor probe to on-line measurement of in-situ volumetric fractions in two and three-phase flows. Therefore, we present the calibration work, through quick-closing valves, and validation techniques under certain conditions and for different flows patterns. A transducer circuit to transmit the capacitance sign accurately from the sensors to the central acquisition was developed. Two sensors with different geometries (rings and helix) comprise the double-sensor capacitive probe. Finally, we propose the solution of a linear system for the direct measurement of in-situ volumetric fraction in three-phase flow.
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Bonilla, Riaño Adriana 1980. "Film thickness measurement with high spatial and temporal resolution planar capacitive sensing in oil-water pipe flow = Medida da espessura de filme usando sensor capacitivo de alta resolução espacial e temporal para escoamentos óleo-água em tubos." [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265764.

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Orientadores: Antonio Carlos Bannwart, Oscar Mauricio Hernandez Rodriguez
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica e Instituto de Geociências
Made available in DSpace on 2018-08-28T09:34:02Z (GMT). No. of bitstreams: 1 BonillaRiano_Adriana_D.pdf: 7155927 bytes, checksum: 63be57b0a5136f5e783cfb4f870b0189 (MD5) Previous issue date: 2015
Resumo: Neste trabalho, é apresentado o desenvolvimento de uma nova técnica para a medição da espessura do filme de água com alta resolução espacial e temporal em escoamento óleo-água. É proposto o uso de um sistema de medição de capacitância elétrica para medir filmes finos de água na proximidade da parede do tubo. O sistema conta com um sensor planar e foi necessário determinar a melhor geometria via simulações baseadas no Método de Elementos Finitos (FEM) para o caso de escoamento óleo-água. As características comparadas foram a profundidade de penetração do campo elétrico no filme de água, a sensibilidade, a resolução espacial mínima e a resposta quase-linear. Padrões de escoamento óleo-água disperso e anular instável foram estudados numa tubulação vertical de 12 m de comprimento, feita de vidro, com 50,8 milímetros de diâmetro interno. Os fluidos usados foram óleo mineral (com densidade 828 kg/m3 e viscosidade 220 mPas) e água da torneira. O trabalho experimental foi realizado nas instalações de escoamento multifásico do Laboratório de Engenharia Térmica e Fluidos (NETeF) da EESC-USP. Foi medida a espessura média do filme de água usando o sistema capacitivo e uma câmera de vídeo de alta velocidade. Para obter a espessura do filme de água a partir das imagens, foi proposto um algoritmo de pré-processamento e um algoritmo de segmentação que combina vários métodos disponíveis na literatura. Os resultados experimentais do sensor capacitivo mostraram que o sistema pode medir espessuras entre 400 µm e 2200 µm. O escoamento anular instável é caracterizado por grandes flutuações na no sentido do escoamento e na direção do perímetro, e estruturas interfaciais grandes (gotas). Por sua vez, o escoamento disperso tem flutuações menores no sentido do escoamento e na direção do perímetro, e estruturas interfaciais menores (gotículas). Uma estrutura interfacial média no espaço e no tempo é proposta para modelar a interface entre a região próxima à parede do tubo e a região do núcleo, e sua análise foi feita no domínio do tempo e da frequência. Foram estudadas a amplitude, velocidade e o comprimento da estrutura interfacial em cada par transmissor-receptor do sensor. Foi possível estabelecer correlações para a velocidade das estruturas em escoamento de óleo em água
Abstract: The development of a new technique for high spatial and temporal resolution film thickness measurement in oil-water flow is presented. A capacitance measurement system is proposed to measure thin water films near to the wall pipe. A planar sensor was chosen for sensing and some geometries were compared using finite elements method (FEM). The penetration depth, the sensitivity, the minimum spatial resolution (high spatial resolution) and the quasi-linear curve were the analyzed characteristics. Dispersed and unstable-annular oil-water flows patterns were studied in a 12-m long vertical glass pipe, with 50.8 mm of internal diameter, using mineral oil (828 kg/m3 of density and 220 mPa s of viscosity) and tap water. The experimental work was carried out in the multiphase-flow facilities of The Thermal-Fluids Engineering Laboratory (NETeF) of EESC-USP. Experiments with a high-speed video camera and the proposed capacitance system were performed to obtain images of the oil-water flow near the pipe wall. A pre-processing enhancement algorithm and a combined segmentation algorithm are proposed and allowed the measurement of characteristic space and time averaged water film thickness. Experimental results of the capacitive technique showed that the system could measure thickness between 400 µm and 2200 µm. It was possible to recognize and characterize typical behaviors of the two different flow patterns studied. Unstable-annular flow can be described by huge fluctuations on the flow direction and perimeter direction, and big interfacial structures (drops). On the other hand, dispersed flow has tiny fluctuations on the flow direction and perimeter direction, and smaller interfacial structures (droplets). An interfacial structure is suggested in order to model the interface between wall and core regions and it was analyzed in time and frequency domains; amplitude, velocity and wavelength at each pair transmitter-receiver of the sensor were studied. Correlations for the interfacial structure velocity were found for dispersed oil-in-water flow and unstable-annular flow
Doutorado
Explotação
Doutora em Ciências e Engenharia de Petróleo
CAPES
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Glockner, Gregory D. "Dynamic network flow with uncertain arc capacities." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/30734.

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Mohorko, Martin. "Návrh optimalizace technologických pracovišť v malém strojírenském podniku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318758.

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This master´s thesis is focused on technological designing in a small company ENGITEC Motosport s.r.o. In first theoretical part of the thesis is this subject described in detail and analyzed in terms of economic and technical aspect. Next part describes the current state of the company and the production hall as well with keep on its current layout. In the following chapters is chosen piston-shaped component, which is manufactured by the company and three different variants of the piston production. Then one of them is selected, to which all related capacities calculations are made. In the final part of the thesis is proposed the relevant final layout of the hall and there is also the technical-economic evaluation of the most relevant variant included. Key words
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Mitana, Petr. "Posouzení možnosti revitalizace vodního toku Osoblaha – úsek I." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227691.

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Diploma thesis deal with the issue revitalization of water stream. Assessment and design of revitalization is done for watercourse Osoblaha, situated in the cadastral territory Osoblaha nad Studnice by Osoblaha. In diploma thesis were designed several of revitalization measures such as stone backfill, willow fence, groyne, casting willow cuttings to supplement the vegetation on river‘s banks, fish shelter and wirestone baskets (gabions). In the given section was designed pool and also was there designed boulder slip, which will replace present downflow step. After designing was made hydrotechnical calculations to demostrate preservation runoff conditions of present stream condition.
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Santos, Greg José dos. "Sensor capacitivo inteligente para monitoramento de escoamentos bifásicos." Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/1304.

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CAPES; ANP; FINEP; MCT; PETROBRAS
Escoamentos bifásicos são encontrados com frequência, em atividades industriais, como por exemplo, em reatores químicos e nas operações de produção e transporte de petróleo, onde escoamentos do tipo gás-liquido são os mais comuns. Esses são caracterizados pela passagem simultânea de dois fluidos imiscíveis em um duto, podendo tomar diversas formas ao longo da tubulação, chamado de padrão ou regime de escoamento. Em muitos casos, o tipo de escoamento determina a eficiência e segurança dos processos ou plantas onde tais ocorrem. Desta forma, a monitoração em tempo real de escoamentos bifásicos é de grande importância. O objetivo deste trabalho é desenvolver um sensor inteligente para monitoramento de escoamento bifásico. Foram selecionados dois parâmetros importantes de monitoração, o primeiro deles é a fração de gás e o segundo a velocidade de translação de bolhas. Para isso foi desenvolvido uma sonda capacitiva que explora a diferença da permissividade elétrica das fases para diferenciá-las. Além disso, uma eletrônica anteriormente desenvolvida foi aprimorada para tornar possível a medição de dois canais simultaneamente e o firmware modificado para realização do cálculo de fração de vazio e velocidades de forma embarcada. A resposta da sonda capacitiva desenvolvida não depende apenas da proporção volumétrica das fases, mas também da forma que estão distribuídas em seu interior, portanto simulações de campo elétrico pelo método de elementos finitos foram realizadas para o levantamento da resposta do mesmo. A resposta do sensor foi validada através de testes estáticos e em escoamentos em plantas controladas, onde os resultados foram comparados com os obtidos, em medidas simultâneas com o sensor wire-mesh, adotado como referência neste trabalho. Os resultados obtidos mostram que o sensor capacitivo é capaz de medir os parâmetros de forma satisfatória. Assim, este sensor pode ser empregado em trabalhos futuros como ferramenta simples para monitoração de escoamentos bifásicos.
Two-phase flow is frequently found in industrial activities, for instance in chemical reactors or during oil production and transport, where gas-liquid flow type is the most common. Such flow is characterized by the simultaneous passage of two immiscible fluids in a pipe. The fluids may assume various spatial distributions in a pipe, which are classified into flow regimes. In many cases, the type of flow determines the efficiency and safety of the processes or plants in which they occur. The objective of this work is to develop a smart sensor for real-time monitoring of two-phase flows. Here two important monitoring parameters were selected; the first is the gas void fraction and the second translational bubble velocities. To this aim, a capacitive probe was developed that exploits the difference in electrical permittivity of the phases. In addition, a previously developed electronics have been further developed to make it possible to measure two channels simultaneously and the firmware has been modified for performing the calculation of the two parameters directly in the embedded microcontroller. The response of the capacitive probe depends not only on the volume fraction of the phases, but it also depends on the way they are distributed inside the pipe. In order to account for this, electric field simulations by finite element method were performed to survey the sensor responses. The overall sensor response was validated by static tests and controlled flow experiments in a pilot plant. The measurement results were compared with those obtained by simultaneous measurements with a wire-mesh sensor which was adopted as reference in this study. The results show that the capacitive sensor is able of measuring the parameters satisfactorily. Hence, the sensor can be applied in future work as a simple tool for two-phase flows monitoring.
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Henzl, David. "Technologický projekt výroby nerotačních (deskových) součástí." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229084.

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The aim of the thesis is to elaborate the technological project for non-rotary (plate) parts production based on requirements of TOS KUŘIM – OS, a.s. The literary studies from the area of machining technology and technological designing are in the first part of the thesis. The evaluation of the contemporary state of production and dividing of products into groups is made in the next part. The following part of the thesis is dealing with the design and analysis of designed variants of disposition, choosing the most suitable variant, its optimalization and evaluation by the help of capacitive calculation. The drawing documentation (material flow included) and technoeconomic evaluation is elaborated in the final part of the thesis.
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Wrasse, Aluísio do Nascimento. "Sensor capacitivo para imageamento direto de escoamentos bifásicos." Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/1152.

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ANP; FINEP; MCT
Os escoamentos bifásicos são encontrados em diversas aplicações industriais, dentre elas na indústria do petróleo como escoamentos gás-líquido em tubulações. O conhecimento da distribuição das fases no escoamento é importante para garantir a operação eficiente e segura de plantas e equipamentos. Na área acadêmica o conhecimento dessa distribuição de fases permite o estudo de fenômenos físicos, além de permitir o desenvolvimento, refinamento e validação de modelos de escoamento. Neste trabalho, foi desenvolvido e investigado o uso de um novo sensor de múltiplas medidas de capacitância para o imageamento direto de escoamentos bifásicos. As medidas são baseadas na diferença na permissividade elétrica entre as fases, ou seja, o sensor pode ser aplicado para investigação de substâncias não-condutivas como óleos e líquidos orgânicos. Com o intuito de aprimorar a geometria do sensor e prever seu comportamento foram realizadas simulações do comportamento elétrico do sensor pelo método dos elementos finitos. O sensor é composto por dois anéis de eletrodos, um anel é o transmissor e o outro anel é o receptor, o qual é segmentado onde cada segmento é individualmente interrogado por uma eletrônica de forma rápida e multiplexada. Desta forma as imagens são geradas e formadas pelos sinais dos eletrodos distribuídos de uma maneira a representar a geometria investigada, o que elimina a necessidade do uso de técnicas de reconstrução de imagens. O sensor é construído em uma placa de circuito impresso flexível que é acoplada na parede interna de uma seção do duto. Uma eletrônica associada é responsável por detectar as variações de capacitância. O sensor desenvolvido, em conjunto com a eletrônica utilizada, foi testado em escoamentos bifásicos estáticos e dinâmicos, horizontais e verticais. As imagens diretas foram geradas para estas diferentes situações, apresentando resultados satisfatórios quando comparado com um sensor de referência. A principal contribuição deste trabalho é a apresentação de uma nova ferramenta capaz de gerar imagens diretas de escoamentos compostos por líquidos não-condutivos sem a necessidade do uso de técnicas de reconstrução de imagens.
Two-phase flow is present in many industrial applications, among them in petroleum industry as gas-liquid flow in pipelines. The knowledge of the phase distribution in the pipe flow is important for the efficiency and safety of the plants. In the academia, the knowledge of this phase distribution allows the understanding of physical phenomena, as well as gives support for the development, refinement and validation of physical models. In this work, a novel capacitive array sensor has been developed and its use was investigated to image two-phase flow. The measuring principle is based on the difference between electrical permittivity of the phases. Therefore the sensor can be applied to electrically non-conductive substances such as oil and organic liquids. Several simulations based on Finite Element Method have been performed to improve the sensor geometry and predict its electrical behavior. The sensor consists of two copper rings being one emitter and one receiver ring. Receiver ring is divided into segments which are individually interrogated by the measuring electronics in a fast and multiplexed manner. In this way, images are directly generated from acquired signals of electrodes, in a way that visually represents the investigated geometry avoiding the use of some image reconstruction technique. The sensor is fabricated in a flexible printed-circuit board which is flush- mounted inside the pipe wall. A measuring electronics is responsible to detect the capacitance changes in the electrodes. The introduced sensor along with the associated electronics has been tested in static and dynamic two-phase flow, both horizontally and vertically. Direct images were generated in these different situations showing satisfactory results when compared to a reference sensor. Main contribution of this work is the introduction of a new measuring tool which is able to image flow (also containing electrically non-conducting fluids) with no need to apply image reconstruction techniques.
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Books on the topic "Capacitive flow"

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Mazo, Aleksandr, and Konstantin Potashev. The superelements. Modeling of oil fields development. ru: INFRA-M Academic Publishing LLC., 2020. http://dx.doi.org/10.12737/1043236.

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This monograph presents the basics of super-element modeling method of two-phase fluid flows occurring during the development of oil reservoir. The simulation is performed in two stages to reduce the spatial and temporal scales of the studied processes. In the first stage of modeling of development of oil deposits built long-term (for decades) the model of the global dynamics of the flooding on the super-element computational grid with a step equal to the average distance between wells (200-500 m). Local filtration flow, caused by the action of geological and technical methods of stimulation, are modeled in the second stage using a special mathematical models using computational grids with high resolution detail for the space of from 0.1 to 10 m and time — from 102 to 105 C. The results of application of the presented models to the solution of practical tasks of development of oil reservoir. Special attention is paid to the issue of value transfer in filtration-capacitive properties of the reservoir, with a detailed grid of the geological model on the larger grid reservoir models. Designed for professionals in the field of mathematical and numerical modeling of fluid flows occurring during the development of oil fields and using traditional commercial software packages, as well as developing their own software. May be of interest to undergraduate and graduate students studying in areas such as "Mechanics and mathematical modeling", "Applied mathematics", "Oil and gas".
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Semmens, Marie C. ARCADY2: An enhanced program to model capacities, queues and delays at roundabouts. Crowthorne, Berkshire: Traffic Systems Division, Traffic Engineering and Control Department, Transport and Road Research Laboratory, 1985.

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Semmens, Marie C. ARCADY 2: An enhanced program to model capacities, queues and delays at roundabouts. Crowthorne: Transport and Road Research Laboratory, 1985.

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Semmens, Marie C. PICADY2: An enhanced program to model capacities, queues and delays at major/minor priority junctions. Crowthorne, Berks: Transport and Road Research Laboratory, Traffic Engineering and Control Dept., Traffic Systems Division, 1985.

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Semmens, Marie C. PICADY2: An enhanced program to model capacities, queues and delays at major/minor priority junctions. Crowthorne, Berkshire: Traffic Systems Division, Traffic Engineering and Control Department, Transport and Road Research Laboratory, 1985.

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Semmens, Marie C. PICADY 2: An enhanced program to model capacities, queues and delays at major/minor priority junctions. Crowthorne: Transport and Road Research Laboratory, 1985.

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Choi, Wonjoon. Network flow models of building evacuation problems with flow- dependent arc capacities. 1987.

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Nakamura, Jeanne, and Scott Roberts. The Hypo-egoic Component of Flow. Edited by Kirk Warren Brown and Mark R. Leary. Oxford University Press, 2016. http://dx.doi.org/10.1093/oxfordhb/9780199328079.013.9.

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Flow is a state of deep absorption that may be experienced when engaged in activities that stretch one’s capacities. A defining feature of the flow state is a reduction in self-awareness, which has been described in the flow literature as loss of self-consciousness. This chapter specifies the senses in which awareness of the self is, and is not, lost when one is in flow. It reviews the phenomenological, psychometric, and neurophysiological literatures addressing hypo-egoism in flow, suggesting that flow activities are characterized by hypo-egoic complexity or a dialectical interplay of directed and effortless attention. Flow is seen to be both hypo-egoic and egoic, with a loss of self-awareness and yet ultimately a growth of the self. The chapter considers whether the hypo-egoism in flow extends beyond loss of self-awareness to a focus on domains larger than the individual self, and calls for more research on the hypo-egoic component of flow.
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Martin, Graham R. What Drives Bird Senses? Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780199694532.003.0008.

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Many tasks could drive the evolution of bird sensory systems. Key candidates are flight, foraging, predator detection, and reproduction. Comparative analysis of visual fields and retinal structures shows functionally significant differences in the vision of even closely related species. These are best explained by foraging being the primary driver of vision in birds, and this is traded-off against the demands of predator detection. The key task is the control of bill position and timing its arrival at a target. This is achieved by the extraction of information from the optic flow-field which expands symmetrically about the bill when it is travelling towards a target. The provision of such flow-fields is the prime function of binocular vision. Informational demands for flight control are met within constraints determined by those for precise bill control. Other sensory capacities also appear to be driven primarily by the informational demands of foraging.
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Lavenex, Sandra. 15. Justice and Home Affairs Institutional Change and Policy Continuity. Oxford University Press, 2017. http://dx.doi.org/10.1093/hepl/9780199689675.003.0015.

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This chapter examines the European Union’s justice and home affairs (JHA), which have evolved from a peripheral aspect into a focal point of European integration. It first considers the institutionalization of JHA cooperation, focusing on the Treaty of Lisbon which constitutes a milestone in the communitarization process, before discussing the main actors in the JHA. In particular, it looks at the organization and capacities of EU institutions, the continuity of intergovernmentalism, and the proliferation of semi-autonomous agencies and databases. It also explores the flow of policy, taking into account asylum policy and immigration policy, police and judicial cooperation in criminal matters, and the challenge of implementation. The chapter shows how cooperation among national agencies concerned with combating crime, fighting terrorism, and managing borders, immigration and asylum has gradually moved from loose intergovernmental cooperation to more supranational governance within the EU.
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Book chapters on the topic "Capacitive flow"

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Sayah, Rafik, Miloua Farid, and Ouari Abbes. "Control of Particles Flow in Pneumatic Conveying Lines by Capacitive Measurement." In Recent Advances in Environmental Science from the Euro-Mediterranean and Surrounding Regions, 1071–74. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-70548-4_309.

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Demori, M., V. Ferrari, and D. Strazza. "Capacitive Sensor System for Investigation of Two-Phase Flow in Pipes." In Lecture Notes in Electrical Engineering, 419–23. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-3606-3_85.

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Yatsiv, S. "Conductively Cooled Capacitively Coupled RF Excited CO2 Lasers." In Gas Flow and Chemical Lasers, 252–57. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-71859-5_38.

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Fleischer, Lisa. "Universally Maximum Flow with Piecewise-Constant Capacities." In Integer Programming and Combinatorial Optimization, 151–65. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/3-540-48777-8_12.

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Demgensky, I., and H. C. Wirth. "Cost Flow Improvement by Upgrading Costs and Capacities." In Operations Research Proceedings 2000, 42–48. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-56656-1_7.

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Kerner, Boris S. "Infinite Number of Highway Capacities of Free Flow at Bottleneck." In Introduction to Modern Traffic Flow Theory and Control, 73–79. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02605-8_4.

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Ji, Xiaoyu, Lixing Yang, and Zhen Shao. "Chance Constrained Maximum Flow Problem with Fuzzy Arc Capacities." In Lecture Notes in Computer Science, 11–19. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-37275-2_2.

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Karp, Richard, Till Nierhoff, and Till Tantau. "Optimal Flow Distribution Among Multiple Channels with Unknown Capacities." In Lecture Notes in Computer Science, 111–28. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11685654_4.

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Kaplan, Haim, and Yahav Nussbaum. "Maximum Flow in Directed Planar Graphs with Vertex Capacities." In Lecture Notes in Computer Science, 397–407. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-04128-0_36.

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Kindt, Andreas. "Multicommodity Network Flow Problems with Overlapping Capacities for Several Products." In Operations Research Proceedings 1993, 221. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-78910-6_78.

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Conference papers on the topic "Capacitive flow"

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Tkach, Vitaliy, Vasyl Achkevych, Viacheslav Bratishko, and Oksana Achkevych. "Milkmeter based on electric capacitive flow sensor." In 20th International Scientific Conference Engineering for Rural Development. Latvia University of Life Sciences and Technologies, Faculty of Engineering, 2021. http://dx.doi.org/10.22616/erdev.2021.20.tf108.

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Jang, Jaesung, and Steven T. Wereley. "Slip Flow Analyses of a Capacitive Pressure-Based Micro Flow Sensor." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-41142.

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We present gas flow measurements and slip flow analyses considering velocity slip at the wall in a capacitive pressure-based micro flow sensor. The sensor consists of a pair of capacitors for measuring pressure difference between the inlet and outlet and absolute pressure at the outlet, inlet/outlet reservoirs, and the main microchannel. The main microchannel is 128.0μm wide, 4.64μm deep, and 5680μm long, where the outlet Knudsen number is 0.0137. The sensor was fabricated using wet etching, ultrasonic drilling, Deep Reactive Ion Etching (RIE) and anodic bonding. The capacitance change of the sensor and the mass flow rate of nitrogen were measured as the inlet to outlet pressure ration increased up to 1.24. With the increasing pressure difference, the capacitance change of the differential pressure sensor increases. The TMAC for the channel whose sides are made of silicon dioxide and Pyrex #7740 glass was extracted for nitrogen. The friction factor was also measured and compared with a previous simulation result.
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Wei, Ze-Wen, Ming Qin, and Qing-An Huang. "A Novel 2-D Capacitive Silicon Flow Sensor." In 2007 IEEE Sensors. IEEE, 2007. http://dx.doi.org/10.1109/icsens.2007.4388544.

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Wissman, James P., Kaushik Sampath, and Charles A. Rohde. "Liquid metal-based bio-inspired capacitive flow sensor." In Bioinspiration, Biomimetics, and Bioreplication IX, edited by Akhlesh Lakhtakia, Raúl J. Martín-Palma, and Mato Knez. SPIE, 2019. http://dx.doi.org/10.1117/12.2514355.

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Slavik, Lubomir, and Miroslav Novak. "Magnetic circuit of electromagnetic flow meter with capacitive electrodes." In 2017 IEEE International Workshop of Electronics, Control, Measurement, Signals and their Application to Mechatronics (ECMSM). IEEE, 2017. http://dx.doi.org/10.1109/ecmsm.2017.7945903.

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Hrach, Daniel, and Anton Fuchs. "Investigation of field electrode geometries in capacitive flow measurement." In 2008 IEEE Sensors. IEEE, 2008. http://dx.doi.org/10.1109/icsens.2008.4716372.

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Haneveld, J., T. S. J. Lammerink, M. J. de Boer, and R. J. Wiegerink. "Micro Coriolis Mass Flow Sensor with Integrated Capacitive Readout." In 2009 IEEE 22nd International Conference on Micro Electro Mechanical Systems (MEMS). IEEE, 2009. http://dx.doi.org/10.1109/memsys.2009.4805419.

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Wrasse, Aluisio do N., Tiago P. Vendruscolo, Eduardo N. Santos, Fernando C. Castaldo, Rigoberto E. M. Morales, and Marco Jose da Silva. "Capacitive direct-imaging sensor for two-phase flow visualization." In 2016 IEEE SENSORS. IEEE, 2016. http://dx.doi.org/10.1109/icsens.2016.7808576.

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Canie`re, Hugo, Bruno Bauwens, Christophe T’Joen, and Michel De Paepe. "Capacitive Void Fraction Measurements and Probabilistic Flow Pattern Mapping of Horizontal Refrigerant Flow." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22576.

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A capacitive void fraction sensor was developed to study the dynamic behavior of refrigerant two-phase flows in horizontal macro-scale smooth tubes of evaporators used in air-conditioning and heat pump applications. A first prototype was successfully tested with air-water flow. The dielectric constant of liquid HFC refrigerants however is much smaller than the one of water, which results in much smaller capacitances to be measured. Therefore an improved version of the capacitance transducer was developed to make dynamic measurements of these HFC fluids possible. The sensor signal can be used for flow pattern detection and void fraction measurements of high pressure HFCs. A macro-scale test facility for two-phase flow and heat transfer studies of high pressure HFCs was designed and constructed. The adiabatic test section consists of a sight glass with high speed camera and the capacitive void fraction sensor. Two datasets of sensor signals were gathered using R410A and R134a respectively (G = 200–500kg/m2s and x from 0 to 1 in steps of 0.025 at Tsat = 15°C). To find more objectivity in flow pattern mapping, a signal analysis was performed. The average, the variance and a high frequency parameter were found suitable for flow regime classification into slug flow, intermittent flow and annular flow by using the fuzzy c-means clustering algorithm. A probabilistic flow pattern map is presented for the HFC data. These maps clearly quantify the width of the transition zones and can be applied for probabilistic heat transfer and/or pressure drop modeling.
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Wang, Baoliang, Yongfeng Fu, Zhiyao Huang, and Haiqing Li. "Volumetric flow rate measurement with capacitive electromagnetic flowmeter in oil-water two-phase flow." In 2010 IEEE Instrumentation & Measurement Technology Conference Proceedings. IEEE, 2010. http://dx.doi.org/10.1109/imtc.2010.5488001.

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Reports on the topic "Capacitive flow"

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Bhandarkar, A., M. R. Ceron, P. G. Campbell, S. Hawks, and C. Loeb. Effects of Pore Size on Na/Ca Ion Selectivity Using Flow Through Electrode Capacitive Deionization. Office of Scientific and Technical Information (OSTI), July 2019. http://dx.doi.org/10.2172/1568013.

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Bobis, J. P., K. G. A. Porges, A. C. Raptis, W. E. Brewer, and L. T. Bernovich. Particle velocity and solid volume fraction measurements with a new capacitive flowmeter at the Solid/Gas Flow Test Facility. [Glass beads]. Office of Scientific and Technical Information (OSTI), August 1986. http://dx.doi.org/10.2172/6918929.

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Sgurev, Vassil. Artificial Neural Networks as a Network Flow with Capacities. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, September 2018. http://dx.doi.org/10.7546/crabs.2018.09.12.

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