Download or read book AN EXPERIMENTAL INVESTIGATION OF THE EFFECTS OF SURFACE CONDITIONS ON POOL BOILING HEAT TRANSFER FOR VARIOUS MATERIALS written by Shikha Ebrahim and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this research, minimum film boiling temperature (Tmin) is quantitatively determined as a function of the initial substrate temperature, liquid subcooling, surface thermophysical properties and surface conditions. Since Tmin defines the boundary between the film and transition boiling regimes, its value is significant for the design of an emergency core cooling system following a hypothetical loss-of-coolant accident (LOCA) in a nuclear power plant. When a sufficiently heated surface is plunged in a water pool, a vapor blanket is generated around the test section acting as a heat transfer insulator due to the poor thermal conductivity of the vapor. At temperatures lower than Tmin, the heat transfer is dramatically enhanced owing the collapse of the vapor film allowing direct physical contact between the water and the heated surface. Therefore, it is very important to explore methods and techniques that increase this temperature in order to improve the safety of nuclear reactors. A test facility was designed and constructed to conduct quenching experiments using vertical rods. Seven cylindrical test samples were fabricated with embedded thermocouples inside the cladding material. The thermocouples were connected to a data acquisition system in order to measure the temperature history during the experiments. The temperature and heat flux at the surface were calculated using an inverse heat conduction code along with an advance image processing technique to quantitatively characterize the liquid-vapor interfacial waves, vapor layer thickness, Tmin, quenching temperature, quenching time, and quench front velocity in the film boiling heat transfer regime. Visualization of the boiling behavior was captured by a high-speed camera at a frame rate of 750 frames per second (fps). The thermocouple data and the captured videos were synchronized to couple the behavior of the vapor layer with the thermal behavior of the heated sample. Various characterization techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM) associated with Energy-dispersive X-ray spectroscopy (EDS), and field emission scanning electron were employed to identify the phases, chemical composition, and surface microstructure of the Inconel-600 before and after being used in a 7 x 7 rod bundle facility. Micro- and nanoparticles composed of nickel, chromium, and iron oxides were observed at the surface of the oxidized Inconel samples. It was found that the porous microstructure coupled with the increase in liquid spreading played a significant role in the enhancement of the film boiling heat transfer. Finally, the heat transfer behavior in the film boiling regime was investigated by calculating the heat transfer coefficient and Nusselt number for various cases. The novelty of this research is the coupling between the results of the quenching experiments and the surface characterization analyses that prompted the development of a new correlation for Tmin. This correlation adequately captures the effects of liquid subcooling, porosity of the oxide layer, and system pressure.
Download or read book Experimental Investigation on Effect of Heterogeneous Wettable Surfaces on Pool Boiling Heat Transfer Performance of Cylindrical Copper Surface written by 張耀文 and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Abstracts of Dissertations Theses and Research Papers Submitted by Candidates for Degrees written by Naval Postgraduate School (U.S.) and published by . This book was released on 1963 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1975 with total page 808 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Natural Convection Heat Transfer in Boiling of Metals written by V. I. Subbotin and published by . This book was released on 1971 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental Study of Sodium Pool Boiling Heat Transfer written by R. C. Noyes and published by . This book was released on 1962 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book VDI Heat Atlas written by VDI Gesellschaft and published by Springer Science & Business Media. This book was released on 2010-07-21 with total page 1608 pages. Available in PDF, EPUB and Kindle. Book excerpt: For more than 50 years, the Springer VDI Heat Atlas has been an indispensable working means for engineers dealing with questions of heat transfer. Featuring 50% more content, this new edition covers most fields of heat transfer in industrial and engineering applications. It presents the interrelationships between basic scientific methods, experimental techniques, model-based analysis and their transfer to technical applications.
Download or read book NASA Technical Translation written by and published by . This book was released on 1971 with total page 1168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Heat Transfer written by and published by Elsevier. This book was released on 2023-09-13 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Heat Transfer, Volume 56, presents the latest in a serial that highlights new advances in the field, with this updated volume presenting interesting chapters written by an international board of authors. - Provides the authority and expertise of leading contributors from an international board of authors - Presents the latest release in Advances in Heat Transfer serials
Download or read book Hydrodynamic Aspects of Boiling Heat Transfer written by N. Zuber and published by . This book was released on 1959 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of Heat Transfer written by and published by . This book was released on 1981 with total page 852 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Investigation of Pool Boiling Heat Transfer Augmentation in R 123 Using the Electrohydrodynamic Technique and Its Long Term Effects written by Alok Kumar and published by . This book was released on 1994 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Sixteenth International Cryogenic Engineering Conference International Cryogenic Materials Conference written by T. Haruyama and published by Elsevier. This book was released on 1997-04-01 with total page 766 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the proceedings of the 16th ICEC/ICMC Conference, held in Kitakyushu, Japan, on 20th-24th May 1996. The Proceedings are presented in three volumes containing a total of 476 papers from 1484 authors. The proceedings covers the main areas of: Large Scale Refrigeration. Cryocoolers. Cryogenic Engineering. Space Cryogenics. Application of Superconductivity. Oxide Superconductors. Metallic Superconductors. Metallic Materials. Non Metallic Materials.In addition there are seven Plenary Lectures covering such diverse topics as commercialization of high-Tc superconductors, the continuing development of the Maglev system in Japan, and the Large Hadron Collider project. The Proceedings comprise an excellent and up-to-date summary of research and development in the fields of Cryogenics and Superconductivity.
Download or read book Enhancement of Pool Boiling Critical Heat Flux in Dielectric Liquids written by Mehmet Arik and published by . This book was released on 2001 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Scientific and Technical Reports written by United States. National Aeronautics and Space Administration Scientific and Technical Information Division and published by . This book was released on 1964 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermal Energy written by Yatish T. Shah and published by CRC Press. This book was released on 2018-01-12 with total page 1112 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book details sources of thermal energy, methods of capture, and applications. It describes the basics of thermal energy, including measuring thermal energy, laws of thermodynamics that govern its use and transformation, modes of thermal energy, conventional processes, devices and materials, and the methods by which it is transferred. It covers 8 sources of thermal energy: combustion, fusion (solar) fission (nuclear), geothermal, microwave, plasma, waste heat, and thermal energy storage. In each case, the methods of production and capture and its uses are described in detail. It also discusses novel processes and devices used to improve transfer and transformation processes.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1979 with total page 1696 pages. Available in PDF, EPUB and Kindle. Book excerpt:
