Download or read book An Experimental and Numerical Study of Droplet Motion and Enhanced Condensation Due to Mechanical Vibrations written by Ryan Andrew Huber and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Energy-Water nexus is devoted to studying how to reduce the amount of water consumption needed to produce power. In 2010, the U.S. energy production accounted for 40% of freshwater withdrawals and 3% of freshwater consumption [1]. This research focuses on reducing the amount of drift loss from evaporative cooling towers at power plants by condensing the drift loss while it is inside the cooling tower, so it may be collected and reused or recycled in the area. Ghosh et al. [2] used a simple mesh screen in order to collect 40% of the drift loss. This research studies the impacts of vibrations on droplet shedding during condensation; the sooner droplets depart from the condensing surface, the higher the rate of heat transfer [3, 4]. This research focuses on understanding the fundamentals of the droplets motion on a vertical hydrophobic surface in order to determine how to best utilize vibrational forces in order to shed the droplets as fast as possible. Visualization studies examined the droplet modes of 3-μL water droplets at three different vibration settings (i.e., 30 Hz, 70 Hz, and 100 Hz). The resulting modes that were observed were rocking (i.e., no droplet slip), ratchet (i.e., droplet slipping), and ejection (i.e., detaching from the surface). In addition to filtered and de-ionized (DI) water, three other water samples (e.g., simulated salt, flue gas desulfurization, and cooling tower blowdown) were tested in this manner in order to determine how the water properties affected the droplet modes. Numerical studies using the lattice Boltzmann method were validated against experimental results. Numerical studies of the de-ionized water droplets allowed for uncoupling of the vibrational directions, showing that vibrational forces in the direction of gravity played the most important role in droplet shedding. The numerical studies also allowed for test cases that were difficult to accomplish with the experimental apparatus to be conducted. Visual condensation tests showed that the vibrations allowed for droplets to begin shedding earlier (i.e., 20 minutes on vibrating compared to 110 minutes on stationary surfaces) and at smaller diameters (e.g., 1 mm vs 5 mm). Experiments were conducted in an environmental chamber at 40 °C and 60% RH. Inside this chamber, condensation heat transfer experiments were conducted on stationary and vibrating hydrophobic surfaces. The condensation heat transfer coefficients of moist air measured in these experiments ranged from 100 to 150 W/m2K, with the average stationary heat transfer coefficient of 120 W/m2K and the average vibrating heat transfer coefficient of 130 W/m2K. Although the measured difference is modest, it shows that there is a possibility of this being a viable method to enhance condensation heat transfer. Further work is needed to improve the condensation rate of the apparatus in order to better understand the impacts and improvements vibrations have on the heat transfer coefficient.

Download or read book An Experimental and Numerical Study of Droplet Condensation in the Presence of a Non condensable Gas written by Albert Francis Tenbusch and published by . This book was released on 1995 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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Download or read book 21st Century Surface Science written by Phuong Pham and published by BoD – Books on Demand. This book was released on 2020-11-26 with total page 295 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface sciences elucidate the physical and chemical aspects of the surfaces and interfaces of materials. Of great interest in this field are nanomaterials, which have recently experienced breakthroughs in synthesis and application. As such, this book presents some recent representative achievements in the field of surface science, including synthesis techniques, surface modifications, nanoparticle-based smart coatings, wettability of different surfaces, physics/chemistry characterizations, and growth kinetics of thin films. In addition, the book illustrates some of the important applications related to silicon, CVD graphene, graphene oxide, transition metal dichalcogenides, carbon nanotubes, carbon nanoparticles, transparent conducting oxide, and metal oxides.

Download or read book Physics Briefs written by and published by . This book was released on 1992 with total page 864 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bulletin of the Atomic Scientists written by and published by . This book was released on 1970-12 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Bulletin of the Atomic Scientists is the premier public resource on scientific and technological developments that impact global security. Founded by Manhattan Project Scientists, the Bulletin's iconic "Doomsday Clock" stimulates solutions for a safer world.

Download or read book American Doctoral Dissertations written by and published by . This book was released on 2000 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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Download or read book Multiphase Flow Handbook Second Edition written by Efstathios Michaelides and published by CRC Press. This book was released on 2016-10-26 with total page 1559 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Multiphase Flow Handbook, Second Edition is a thoroughly updated and reorganized revision of the late Clayton Crowe’s work, and provides a detailed look at the basic concepts and the wide range of applications in this important area of thermal/fluids engineering. Revised by the new editors, Efstathios E. (Stathis) Michaelides and John D. Schwarzkopf, the new Second Edition begins with two chapters covering fundamental concepts and methods that pertain to all the types and applications of multiphase flow. The remaining chapters cover the applications and engineering systems that are relevant to all the types of multiphase flow and heat transfer. The twenty-one chapters and several sections of the book include the basic science as well as the contemporary engineering and technological applications of multiphase flow in a comprehensive way that is easy to follow and be understood. The editors created a common set of nomenclature that is used throughout the book, allowing readers to easily compare fundamental theory with currently developing concepts and applications. With contributed chapters from sixty-two leading experts around the world, the Multiphase Flow Handbook, Second Edition is an essential reference for all researchers, academics and engineers working with complex thermal and fluid systems.

Download or read book Peterson s Guide to Graduate Programs in Engineering and Applied Sciences written by and published by . This book was released on 1985 with total page 896 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Engineering Index Annual written by and published by . This book was released on 1993 with total page 2264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since its creation in 1884, Engineering Index has covered virtually every major engineering innovation from around the world. It serves as the historical record of virtually every major engineering innovation of the 20th century. Recent content is a vital resource for current awareness, new production information, technological forecasting and competitive intelligence. The world?s most comprehensive interdisciplinary engineering database, Engineering Index contains over 10.7 million records. Each year, over 500,000 new abstracts are added from over 5,000 scholarly journals, trade magazines, and conference proceedings. Coverage spans over 175 engineering disciplines from over 80 countries. Updated weekly.

Download or read book Microgravity Research in Support of Technologies for the Human Exploration and Development of Space and Planetary Bodies written by Committee on Microgravity Research and published by National Academies Press. This book was released on 2000-07-17 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: The frontier represented by the near solar system confronts humanity with intriguing challenges and opportunities. With the inception of the Human Exploration and Development of Space (HEDS) enterprise in 1995, NASA has acknowledged the opportunities and has accepted the very significant challenges. Microgravity Research in Support of Technologies for the Human Exploration and Development of Space and Planetary Bodies was commissioned by NASA to assist it in coordinating the scientific information relevant to anticipating, identifying, and solving the technical problems that must be addressed throughout the HEDS program over the coming decades. This report assesses scientific and related technological issues facing NASA's Human Exploration and Development of Space endeavor, looking specifically at mission enabling and enhancing technologies which, for development, require an improved understanding of fluid and material behavior in a reduced gravity environment.

Download or read book Droplet Wetting and Evaporation written by David Brutin and published by Academic Press. This book was released on 2015-05-11 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: Droplet Wetting and Evaporation provides engineers, students, and researchers with the first comprehensive guide to the theory and applications of droplet wetting and evaporation. Beginning with a relevant theoretical background, the book moves on to consider specific aspects, including heat transfer, flow instabilities, and the drying of complex fluid droplets. Each chapter covers the principles of the subject, addressing corresponding practical issues and problems. The text is ideal for a broad range of domains, from aerospace and materials, to biomedical applications, comprehensively relaying the challenges and approaches from the different communities leading the way in droplet research and development. - Provides a broad, cross-subject coverage of theory and application that is ideal for engineers, students and researchers who need to follow all major developments in this interdisciplinary field - Includes comprehensive discussions of heat transfer, flow instabilities, and the drying of complex fluid droplets - Begins with an accessible summary of fundamental theory before moving on to specific areas such as heat transfer, flow instabilities, and the drying of complex fluid droplets

Download or read book Government wide Index to Federal Research Development Reports written by and published by . This book was released on 1966 with total page 1336 pages. Available in PDF, EPUB and Kindle. Book excerpt: