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Combustion Of A Polymer Pmma Sphere In Microgravity
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Book Synopsis Combustion of a Polymer (PMMA) Sphere in Microgravity by : Jiann C. Yang
Download or read book Combustion of a Polymer (PMMA) Sphere in Microgravity written by Jiann C. Yang and published by . This book was released on 1999 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: The video sequences revealed a number of dynamic events including bubbling and sputtering as well as soot shell formation and break-up during combustion of the spheres at reduced gravity. The ejection of combusting material from the burning spheres represents a fire hazard that must be considered at reduced gravity. The ejection was found to be sensitive to polymer type, but independent of oxygen concentration and pressure. The average value of the ejection frequency was found to be 3 Hz, 5 Hz, and 5 Hz for PMMA, PS, and PP, respectively. The velocities of the ejected material were estimated by tracking the material in two consecutive video frames. For the PP spheres, Va=2.3 (+/-1.2) cm/s (with 60 events observed). The ejected material appeared to decelerate at an average rate of ~40 cm/s2, and traverse an average distance of only 8 mm before burning to completion.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781720447184 Total Pages :48 pages Book Rating :4.4/5 (471 download)
Book Synopsis Combustion of a Polymer (Pmma) Sphere in Microgravity by : National Aeronautics and Space Administration (NASA)
Download or read book Combustion of a Polymer (Pmma) Sphere in Microgravity written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-29 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of low gravity, aircraft-based, experiments was conducted to investigate the combustion of supported thermoplastic polymer spheres under varying ambient conditions. The three types of thermoplastic investigated were polymethylmethacrylate (PMMA), polypropylene (PP). and polystyrene (PS). Spheres with diameters ranging from 2 mm to 6.35 mm were tested. The total initial pressure varied from 0.05 MPa to 0. 15 MPa whereas the ambient oxygen concentration varied from 19 % to 30 % (by volume). The ignition system consisted of a pair of retractable energized coils. Two CCD cameras recorded the burning histories of the spheres. The video sequences revealed a number of dynamic events including bubbling and sputtering, as well as soot shell formation and break-up during combustion of the spheres at reduced gravity. The ejection of combusting material from the burning spheres represents a fire hazard that must be considered at reduced gravity. The ejection process was found to be sensitive to polymer type. All average burning rates were measured to increase with initial sphere diameter and oxygen concentration, whereas the initial pressure had little effect. The three thermoplastic types exhibited different burning characteristics. For the same initial conditions, the burning rate of PP was slower than PMMA, whereas the burning rate of PS was comparable to PMMA. The transient diameter of the burning thermoplastic exhibited two distinct periods: an initial period (enduring approximately half of the total burn duration) when the diameter remained approximately constant, and a final period when the square of the diameter linearly decreased with time. A simple homogeneous two-phase model was developed to understand the changing diameter of the burning sphere. Its value is based on a competition between diameter reduction due to mass loss from burning and sputtering, and diameter expansion due to the processes of swelling (density decrease with heating) and bubble growth.
Book Synopsis Fourth International Microgravity Combustion Workshop by :
Download or read book Fourth International Microgravity Combustion Workshop written by and published by . This book was released on 1997 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Sixth International Microgravity Combustion Workshop by :
Download or read book Sixth International Microgravity Combustion Workshop written by and published by . This book was released on 2001 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The 3rd International Microgravity Combustion Workshop by :
Download or read book The 3rd International Microgravity Combustion Workshop written by and published by . This book was released on 1995 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Publications of the National Institute of Standards and Technology ... Catalog by : National Institute of Standards and Technology (U.S.)
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Book Synopsis Transport Phenomena in Fires by : Mohammad Faghri
Download or read book Transport Phenomena in Fires written by Mohammad Faghri and published by WIT Press. This book was released on 2008 with total page 497 pages. Available in PDF, EPUB and Kindle. Book excerpt: Controlled fires are beneficial for the generation of heat and power while uncontrolled fires, like fire incidents and wildfires, are detrimental and can cause enormous material damage and human suffering. This edited book presents the state-of-the-art of modeling and numerical simulation of the important transport phenomena in fires. It describes how computational procedures can be used in analysis and design of fire protection and fire safety. Computational fluid dynamics, turbulence modeling, combustion, soot formation, thermal radiation modeling are demonstrated and applied to pool fires, flame spread, wildfires, fires in buildings and other examples.
Author :United States. Congress. Senate. Committee on Appropriations. Subcommittee on VA-HUD-Independent Agencies Publisher : ISBN 13 : Total Pages :1006 pages Book Rating :4.:/5 (319 download)
Book Synopsis Departments of Veterans Affairs and Housing and Urban Development and Independent Agencies Appropriations for Fiscal Year 1995: Corporation for National and Community Service, Department of Veterans Affairs, National Aeronautics and Space Administration, nondepartmental witnesses, Selective Service System by : United States. Congress. Senate. Committee on Appropriations. Subcommittee on VA-HUD-Independent Agencies
Download or read book Departments of Veterans Affairs and Housing and Urban Development and Independent Agencies Appropriations for Fiscal Year 1995: Corporation for National and Community Service, Department of Veterans Affairs, National Aeronautics and Space Administration, nondepartmental witnesses, Selective Service System written by United States. Congress. Senate. Committee on Appropriations. Subcommittee on VA-HUD-Independent Agencies and published by . This book was released on 1995 with total page 1006 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Microgravity Combustion Science: 1995 Program Update by :
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Book Synopsis NASA's Microgravity Research Program by :
Download or read book NASA's Microgravity Research Program written by and published by . This book was released on 1998 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis NASA's Microgravity Science Research Program by :
Download or read book NASA's Microgravity Science Research Program written by and published by . This book was released on 1996 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monthly Catalog of United States Government Publications by :
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Book Synopsis NASA Microgravity Research Program by :
Download or read book NASA Microgravity Research Program written by and published by . This book was released on 1999 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Microgravity Combustion Research: 1999 Program and Results by :
Download or read book Microgravity Combustion Research: 1999 Program and Results written by and published by . This book was released on 1999 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Generalized Pyrolysis Model for Combustible Solids by : Christopher William Lautenberger
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Book Synopsis Progress in Scale Modeling by : Kozo Saito
Download or read book Progress in Scale Modeling written by Kozo Saito and published by Springer Science & Business Media. This book was released on 2008-08-20 with total page 529 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scale modeling can play an important role in R&D. When engineers receive some ideas in new product development, they can test how the new design looks by bui- ing scale models and they can get an actual feeling with the prototype through their imagination. Professor Emori often said: “When children play with a toy airplane, their mind is wondering about the prototype airplane which they haven’t ridden. ” Children can use the scale model airplane as a means to enter into an imagi- tive world of wonder by testing in their own way how the actual airplane might function, how the actual airplane can maneuver aerodynamically, what might be the actual sound of a jet engine, how to safely land the actual airplane, and so on. This imagination that scale models can provide for children will help them later develop professional intuition. Physical scale models can never be entirely succe- fully replaced by computer screens where virtual models are displayed and fancy functions are demonstrated. Not only children but also adults can learn things by actually touching things only offered by physical models, helping all of us develop imagination and feeling eventually leading toward Kufu. Einstein’s famous “thought experiments [11],” which helped him to restructure modern physics may possibly and effectively be taught by letting researchers play with scale models!? References 1. I. Emori, K. Saito, and K. Sekimoto, Mokei Jikken no Riron to Ouyou (Scale Models in Engineering: Its Theory and Application), Gihodo, Tokyo, Third Edition, 2000.
Book Synopsis Government Reports Announcements & Index by :
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