1 edition of Fire spread in a three-dimensional pressure vessel with radiation exchange and wall heat losses found in the catalog.
Fire spread in a three-dimensional pressure vessel with radiation exchange and wall heat losses
Janet K. Raycraft
by Naval Postgraduate School, Available from National Technical Information Service in Monterey, Calif, Springfield, Va
Written in English
A three dimensional differential field model for the spread of fire and smoke, on general orthogonal coordinate systems is developed. The model, which is designed for closed spaces, also includes the physical effects of turbulence, strong buoyancy, full compressibility, pressure rise due to fire loading, surface-surface and surface-flame radiation exchange, and heat losses through the wall. It is based on a control-volume staggered-cell finite- difference approach with primitive variables. Results of numerical calculations based on the field model are compared with test data for a methanol fire in the NRL FIRE I test facility which is in the form of a closed pressure vessel. Reasonable comparisons of the resulting pressure and temperatures at several locations have been obtained. Also shown are the detailed velocity and temperature fields inside the vessel at different time instants after the commencement of the fire. (mjm)
|Statement||by J. Raycraft, M.D. Kelleher, H.Q. Yang, K.Y[i.e. T.] Yang|
|Contributions||Kelleher, Matthew D., Yang H. Q., Yang K. T., Naval Postgraduate School (U.S.). Dept. of Mechanical Engineering|
|The Physical Object|
|Pagination||iii, 54 p. :|
|Number of Pages||54|
satisfy the heat equation. For the three-dimensional cartesian coordinate system, with constant properties and no internal heat generation, the heat equation, Eq. , has the form ∂ ∂ ∂ ∂ ∂ ∂ α ∂ ∂ 22 2T 1 x T y T z T 22 2 t ++.(1) If T(x,y,z) satisfies this relation, conservation of energy . The PSI/PANDA experiments provide data on containment three-dimensional gas flow and distribution issues that are important for code prediction capability improvements, accident management and design of mitigating measures.
(1) and (2), the heat rate qx can be determined for the range of ambient temperature, ≤ T2 ≤ 38°C, with different wall thermal conductivities, k. Heat loss, qx (W) 0 10 20 30 40 Ambient air temperature, T2 (C) Wall thermal conductivity, k = W/m.K k = 1 W/m.K, concrete wall k = W/m.K For. TABLE OF CONTENTS Introduction Background 1 2 Related Planning Guides and Documents Key Properties of Chemical Substances 21 States of Matter Definitions of Temperature and Heat 23 Definition of Pressure 2 4 Vapor Pressures of Liquids and Solids 2 5 Boiling Points as a Function of Pressure 2 6 Definitions of Specific Gravity and Density.
That is hard to do because at 10, feet, heatsinks start relying on radiation as the major heat transport and radiation is the LEAST efficient heat transfer mechanism there is. The result was that heatsinks had to be much larger to work at 10, feet because conductive loss is so much less. Temperature Properties of the Inclined Fire Plume above a Circular Fire Source in Cross-Winds Tomohiko Imamura1, Yasushi Oka*2, Osami Sugawa3, Yoshio Takeishi4 and Terushige Ogawa2 1 Graduate School of Engineering, Yokohama National University, Tokiwa dai, Hodogaya-ku, Yokohama, Kanagawa Pref., , Japan.
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Mathl Comput. Modelling, Vol. 14, pp. Printed in Great Britain FIRE SPREAD IN A THREE-DIMENSIONAL PRESSURE VESSEL WITH RADIATION EXCHANGE AND WALL HEAT LOSSES J. Raycraft* and M. Kelleher Department of Mechanical Engineering Naval Postgraduate School Monterey, CA H.
Yang+ and K. Yang Department of Aerospace and Mechanical Cited by: 8. Fire spread in a three-dimensional pressure vessel with radiation exchange and wall heat losses by Raycraft, Janet K.;Kelleher, Matthew D.;Yang H. Q.;Yang K. : A three-dimensional field model for turbulent flow in an arbitrary compartment, taking into account strong buoyancy, full compressibility, turbulence, surface-surface radiation exchange, and wall heat losses is utilized to simulate a full-scale fire test in a fire room with open doorways located in a decommissioned nuclear reactor containment vessel in by: 2.
Fire Spread in a Three-Dimensional Pressure Vessel with Radiation Exchange and Wall Heat Losses, Mathematical and Computer Modeling, 14, Song, T.
Comparison of Engineering Models of Nongray Behavior of Combustion Products, International Journal of Author: K.T. Yang. Fire spread in a three-dimensional pressure vessel with radiation exchange and wall heat losses December Mathematical and Computer Modelling Janet K.
Raycraft. Stress rupture predictions of pressure vessels exposed to fully engulfing and local impingement accidental fire heat loads Article in Engineering Failure Analysis 16(4) June with. Convective heat transfer, often referred to simply as convection, is the transfer of heat from one place to another by the movement of tion is usually the dominant form of heat transfer in liquids and gases.
Although often discussed as a distinct method of heat transfer, convective heat transfer involves the combined processes of unknown conduction (heat diffusion) and advection. used as the inlet nozzles in reactor pressure vessels [2, 3]. The set-in nozzles have flange set into the vessel wall.
After receiving heat from the nuclear core, the reactor coolant leaves the vessel through the outlet nozzle of the RPV (see Fig.
1) [2, 4]. Reactor pressure vessels are complex geometries andFile Size: 1MB. Where c = speed of sound in meters or feet per second, f = frequency in Hz, and λ = wavelength in meters or feet. Sound Pressure. The vibrations associated with sound are detected as slight variations in pressure.
The range of sound pressures perceived as sound is extremely large, beginning with a very weak pressure causing faint sounds and increasing to noise so loud that it causes pain.
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The three-dimensional shell element allowed the vessel designer much greater flexibility in developing finite element models. Since a great majority of pressure vessels are relatively thin-walled, the shell element enables the designer/analyst to model a complex vessel complete with nozzles, supports and other nonaxisymmetric components.
Finally, the radiated heat is proportional to the object’s surface area, since every part of the surface radiates. If you knock apart the coals of a fire, the radiation increases noticeably due to an increase in radiating surface area. The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:Cited by: 1.
Countering Terrorism: Biological Agents, Transportation Networks, Fire spread in a three-di- mensional pressure vessel with radiation exchange and wall heat losses.
Mathematical and Computer Modeling Cox, G. Combustion Fundamentals of Fire. London: Academic Press, pp. Welch, S., and P.
Rubini. C In connexion with our basic research, which lasted some years, and development work concerning prestressed concrete pressure vessels for gas-cooled and boiling water reactors, we also paid much attention to the breaking behaviour of concrete in the two- and three-dimensional stress field.
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CFD Simulations of Urban and Wildland Fire Spread Among Discrete Fuels Under Effect of Wind. Koyu Satoh, Naian Liu Research on Heat Exchange Characteristics Between Rock and High-Pressure Fluid Through the Cranny Among Dry Hot Rocks Effect of Geometric Parameters on the Performance of a Radial Flow Pressure Exchange Ejector.
Muhammad. Means a vessel or an arrangement of vessels and interconnecting parts, wherein steam or other vapour is generated, or water or other liquid is heated at a pressure above that of the atmosphere, by the application of fire, the products of combustion, electrical power, or similar high temperature means, and - a) include superheaters, reheaters.
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In this case, the heat-up rate of the hot assembly will be much higher, leading to early fuel damage and radioactive material releases. In the absence of heat gain from the hot assemblies, the heat-up rate of the colder fuel assemblies will be lower, limiting the spread of.
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Cahill Health Effects Research Laboratory Research Triangle Park, North Carolina Health Effects Research Laboratory Office of Research and Development U.S. Environmental Protection Agency Research Triangle Park, North Carolina. SCHEMATIC: The relevant heat transfer processes associated with the double-glazed, glass fire screen are: qrad,1 Radiation from flames and cavity wall, portions of which are absorbed and transmitted by the two panes, qrad,2 Emission from inner surface of inner pane to cavity, qrad,3 Net radiation exchange between outer surface of inner pane and.
Proposers should consider structural and pressure vessel implications of the proposed concept. Target applications include liquid oxygen liquefaction system (16 g/s neon gas, 85K.2.
helical thickenings of cell wall impregnated with lignin: withstand high pressure 3. pores in outer cellulose wall: conduct water out of xylem vessel and into cell walls of adjacent leaf cells 4. Lumen of xylem vessel filled with sap: end walls, cell sap and nuceli break down.