Micro Scale Mass Transfer Enhancement At Electrode Surfaces
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Micro Scale Mass Transfer Enhancement At Electrode Surfaces
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Author : Davor Peter Sutija
language : en
Publisher:
Release Date : 1991
Micro Scale Mass Transfer Enhancement At Electrode Surfaces written by Davor Peter Sutija and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.
Micro Scale Mass Transfer Variations During Electrodeposition
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Author :
language : en
Publisher:
Release Date : 1991
Micro Scale Mass Transfer Variations During Electrodeposition written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.
Results of two studies on micro-scale mass-transfer enhancement are reported: (1) Profiled cross-sections of striated zinc surfaces deposited in laminar channel flow were analyzed with fast-fourier transforms (FFT) to determine preferred striation wavelengths. Striation frequency increases with current density until a minimum separation between striae of 150 [mu]m is reached. Beyond this point, independent of substrate used, striae meld together and form a relatively smooth, nodular deposit. Substrates equipped with artificial micron-sized protrusions result in significantly different macro-morphology in zinc deposits. Micro-patterned electrodes (MPE) with hemispherical protrusions 5 [mu]m in diameter yield thin zinc striae at current densities that ordinarily produce random nodular deposits. MPEs with artificial hemi-cylinders, 2.5 [mu]m in height and spaced 250 [mu]m apart, form striae with a period which matches the spacing of micron-sized ridges. (2) A novel, corrosion-resistant micromosaic electrode was fabricated on a silicon wafer. Measurements of mass-transport enhancement to a vertical micromosaic electrode caused by parallel bubble streams rising inside of the diffusion boundary-layer demonstrated the presence of two co-temporal enhancement mechanisms: surface-renewal increases the limiting current within five bubble diameters of the rising column, while bubble-induced laminar flows cause weaker enhancement over a much broader swath. The enhancement caused by bubble curtains is predicted accurately by linear superposition of single-column enhancements. Two columns of smaller H2 bubbles generated at the same volumetric rate as a single column of larger bubbles cause higher peak and far-field enhancements. 168 refs., 96 figs., 6 tabs.
Microscale Resolution Of Interfacial Mass Transfer Rates In Electrode Processes
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Author : Gina Marie Whitney
language : en
Publisher:
Release Date : 1987
Microscale Resolution Of Interfacial Mass Transfer Rates In Electrode Processes written by Gina Marie Whitney and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with categories.
Recent Progress Of Enhanced Bubble Separation In Alkaline Water Electrolyzer
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Author : Lin Yang
language : en
Publisher: OAE Publishing Inc.
Release Date : 2023-09-27
Recent Progress Of Enhanced Bubble Separation In Alkaline Water Electrolyzer written by Lin Yang and has been published by OAE Publishing Inc. this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-09-27 with Science categories.
Alkaline water electrolysis has a large industrial application and development potential in hydrogen energy owing to its high maturity and low cost. However, its moderate energy efficiency, especially caused by bubble effects, inhibits its use for large-scale hydrogen production. To overcome this shortcoming, this review first analyzes the bubble effect and summarizes the external operation methods, such as external field intensification, flow operation, fluctuation operation, and surfactant addition to the electrolyte, to enhance bubble separation in the electrolyzer. Then, electrode and flow channel structure optimization, particularly superhydrophilic and superaerophobic electrodes, and flow channels with varying heights, square column arrangements, and inlet/outlet numbers are highlighted. Finally, future research directions in alkaline water electrolysis technology are suggested to advance the industrial application of large-scale alkaline water electrolysis.
Energy Research Abstracts
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Author :
language : en
Publisher:
Release Date : 1992
Energy Research Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Power resources categories.
Advances In Energy Science And Equipment Engineering
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Author : Shiquan Zhou
language : en
Publisher: CRC Press
Release Date : 2015-11-05
Advances In Energy Science And Equipment Engineering written by Shiquan Zhou and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-11-05 with Science categories.
Advances in Energy Equipment Science and Engineering contains selected papers from the 2015 International Conference on Energy Equipment Science and Engineering (ICEESE 2015, Guangzhou, China, 30-31 May 2015). The topics covered include:- Advanced design technology- Energy and chemical engineering- Energy and environmental engineering- Energy scien
Microscale Heat Transfer Fundamentals And Applications
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Author : S. Kakaç
language : en
Publisher: Springer Science & Business Media
Release Date : 2005-05-02
Microscale Heat Transfer Fundamentals And Applications written by S. Kakaç and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-05-02 with Science categories.
This volume provides a comprehensive state-of-the art assessment of the fundamentals of the Microscale heat transfer and transport phenomena and heat transfer and applications in Microsystems. The modern trend toward miniaturization of devices requires a better understanding of heat mass transfer phenomena in small dimensions. Devices having dimensions of order of microns are being developed for use of cooling of integrated circuits, and in biochemicals-biomedical applications and cryogenics. Microelectromechanical systems (MEMS) have an important impact in medicine, bioengineering, information technologies and other industries.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1992
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Aeronautics categories.
History Of Mechanical Technology And Mechanical Design
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Author : Bo Zhao
language : en
Publisher: Trans Tech Publications Ltd
Release Date : 2010-11-11
History Of Mechanical Technology And Mechanical Design written by Bo Zhao and has been published by Trans Tech Publications Ltd this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-11-11 with Technology & Engineering categories.
Volume is indexed by Thomson Reuters CPCI-S (WoS). This collection of 110 peer-reviewed papers covers the topics of the History of Mechanical Technology, Mechanical Design and Mechanical Manufacture.
Microelectrodes Theory And Applications
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Author : I. Montenegro
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Microelectrodes Theory And Applications written by I. Montenegro and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
The importance of microelectrodes is widely recognised and interest in their application in diverse areas of research has been increasing over the past ten years. In fact, several meetings organized by the International Society of Electrochemistry, The American Chemical Society and The U. S. Electrochemical Society have analysed various aspects of their theory and applications. For this reason it seemed that the time had arrived when scientists from around the world, actively concerned with research in the area of microelectrodes, should meet, exchange ideas and assess the direction of future developments. Furthermore, it seemed appropriate that this meeting should be held as a NATO Advanced Study Institute, so that students and young scientists with research interests in microelectrodes would have the opportunity to interact with experts in the field, establish future collaboration and, hopefully, catalyse new developments in the area. The meeting was held in Alvor, Portugal, in May 1990. This book compiles the lectures delivered in the Institute. It reviews the most important aspects of microelectrodes and points out directions for future research in this field. Several contributions discuss recent developments in theoretical aspects such as the properties of various geometries and computational procedures for solving the equations describing the coupling of mass transport to microelectrodes with heterogeneous electron tranfer and homogeneous chemistry. The materials and methods available for microelectrodes manufacture are presented in some detail. Both steady state and transient techniques are covered and the interaction of theory with experiment is discussed.