Investigation And Mitigation Of Condensation Induced Water Hammer By Stratified Flow Experiments
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Investigation And Mitigation Of Condensation Induced Water Hammer By Stratified Flow Experiments
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Author : Hiral J. Kadakia
language : en
Publisher:
Release Date : 2011
Investigation And Mitigation Of Condensation Induced Water Hammer By Stratified Flow Experiments written by Hiral J. Kadakia and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Using Stratified Flow To Mitigate Condensation Induced Water Hammer
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Author : Richard Raphael Schultz
language : en
Publisher:
Release Date : 2010
Using Stratified Flow To Mitigate Condensation Induced Water Hammer written by Richard Raphael Schultz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Dissertations, Academic categories.
Research accomplished to determine whether stratified flow may be used to prevent the occurrence of condensation-induced water hammer (CIWH) in a horizontal pipe partially-filled with subcooled flowing water in the presence of saturated steam is described. Earlier researchers have shown that CIWH will readily occur in a horizontal pipe under such conditions when the void fraction is greater than 0.2 and the water is subcooled in excess of 20 °C. Such conditions have been shown to occur in advanced reactor systems when using passive emergency core cooling systems designed to ensure the core remains covered. Flow rates from passive emergency core cooling systems, which do not use pumps, are dictated by buoyancy-driven flows that are governed by liquid density-gradients. Research completed at the Idaho State University Thermal-Fluids Laboratory using a steam-water loop and an air-water test apparatus has shown that CIWH may be avoided even with highly subcooled water flowing in the presence of saturated steam if the subcooled flow water is segregated from the saturated steam using a saturated water stratified layer. This research report summarizes: (a) the theory and data that underlie the occurrence of CIWH, (b) an approach for preventing CIWH at flow conditions where CIWH would normally occur, (c) the theory that support the approach, (d) the experiments performed to produce data that support the approach, and (e) how to define the operational envelope where operation is allowed within a horizontal pipe partially-filled with highly-subcooled water in the presence of saturated steam. Because passively-cooled systems in light water reactors are generally configured to provide emergency core cooling flow to a reactor system via horizontal pipes with length-to-diameter (L/D) ratios ranging from 6 to 70, where the pipes are plumbed normal to the reactor vessel downcomer region, the experimental configuration consisted of a horizontal pipe with appropriate LID ranges plumbed to a reservoir that simulated the reactor vessel downcomer. Research indicates that the subcooled water flow rate must be designed to ensure the flow rate is laminar and the steam velocities, moving in the counter-current direction to the subcooled water flow, must be less than a critical value.
Energy Research Abstracts
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Author :
language : en
Publisher:
Release Date : 1986
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 1986 with Power resources categories.
Stability Of Steam Water Countercurrent Stratified Flow
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Author :
language : en
Publisher:
Release Date : 1985
Stability Of Steam Water Countercurrent Stratified Flow written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with categories.
Two flow instabilities which limit the normal condensation processes in countercurrent stratified steam-water flow have been identified experimentally: flooding and condensation-induced waterhammer. In order to initiate condensation-induced waterhammer in nearly horizontal or moderately-inclined steam/subcooled-water flow, two conditions, the appearance of a wavy interface and complete condensation of the incoming steam, are necessary. Analyses of these conditions are performed on a basis of flow stability and heat transfer considerations. Flooding data for several inclinations and channel heights are collected. Effects of condensation, inclination angle and channel height on the flooding characteristics are discussed. An envelope theory for the onset of flooding in inclined stratified flow is developed, which agrees well with the experimental data. Some empirical information on basic flow parameters, such as mean film thickness and interfacial friction factor required for this theory are measured. The previous viewpoints on flooding appear not to conflict with the present experimental data in nearly horizontal flow but the flooding phenomena in nearly vertical flow appear to be more complicated than those described by these viewpoints because of liquid droplet entrainment.
Steam Condensation Induced Water Hammer In A Vertical Up Fill Configuration Within An Integral Test Facility Experiments And Computational Simulations
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Author : Stefan Dirndorfer
language : en
Publisher:
Release Date : 2017
Steam Condensation Induced Water Hammer In A Vertical Up Fill Configuration Within An Integral Test Facility Experiments And Computational Simulations written by Stefan Dirndorfer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Proceedings Of The Asme Jsme Joint Fluids Engineering Conference
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Author :
language : en
Publisher:
Release Date : 2003
Proceedings Of The Asme Jsme Joint Fluids Engineering Conference written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Fluid dynamics categories.
Natural Circulation Phenomena And Modelling For Advanced Water Cooled Reactors
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Author : International Atomic Energy Agency
language : en
Publisher:
Release Date : 2012
Natural Circulation Phenomena And Modelling For Advanced Water Cooled Reactors written by International Atomic Energy Agency and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Science categories.
Based on an IAEA coordinated research project focused on the use of passive safety systems and natural circulation to help meet the safety and economic goals of advanced nuclear power plants, this publication includes the identification and definition of the thermo-hydraulic phenomena that affect the reliability of passive safety systems, characterization of each phenomenon, integral tests to examine the passive systems and natural circulation, and a methodology for examining passive system reliability.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1994
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 1994 with Aeronautics categories.
Ignalina Rbmk 1500 A Source Book
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Author : Kazys Almenas
language : en
Publisher:
Release Date : 1998
Ignalina Rbmk 1500 A Source Book written by Kazys Almenas and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Nuclear power plants categories.
Nuclear Safety In Light Water Reactors
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Author : Bal Raj Sehgal
language : en
Publisher: Academic Press
Release Date : 2012-01-05
Nuclear Safety In Light Water Reactors written by Bal Raj Sehgal and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-01-05 with Technology & Engineering categories.
La 4e de couverture indique : Organizes and presents all the latest thought on LWR nuclear safety in one consolidated volume, provided by the top experts in the field, ensuring high-quality, credible and easily accessible information.