Unsteady Diffusion Flames: Ignition, Travel, and Burnout (SUBCORE Project: Simplified Unsteady Burning of Contained Reactants) PDF Download
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Author:
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Category :
Languages : en
Pages : 68
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 68
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Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781723906619
Category :
Languages : en
Pages : 66
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Book Description
An experimental apparatus for the examination of a planar, virtually strain-rate-free diffusion flame in microgravity has been designed and fabricated. Such a diffusion flame is characterized by relatively large spatial scale and high symmetry (to facilitate probing), and by relatively long fluid-residence time (to facilitate investigation of rates associated with sooting phenomena). Within the squat rectangular apparatus, with impervious, noncatalytic isothermal walls of stainless steel, a thin metallic splitter plate subdivides the contents into half-volumes. One half-volume initially contains fuel vapor diluted with an inert gas, and the other, oxidizer diluted with another inert gas-so that the two domains have equal pressure, density, and temperature. As the separator is removed, by translation in its own plane, through a tightly fitting slit in one side wall, a line ignitor in the opposite side wall initiates a triple-flame propagation across the narrow layer of combustible mixture formed near midheight in the chamber. The planar diffusion flame so emplaced is quickly disrupted in earth gravity. In microgravity, the planar flame persists, and travels ultimately into the half-volume containing the stoichiometrically deficient reactant; the flame eventually becomes extinguished owing to reactant depletion and heat loss to the walls.Fendell, Francis and Rungaldier, HaraldGlenn Research CenterFLAME PROPAGATION; COMBUSTION; DIFFUSION FLAMES; MICROGRAVITY; THIN PLATES; BURNOUT; DEPLETION; STAINLESS STEELS; SYMMETRY; STRAIN RATE; IGNITION
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781721035113
Category :
Languages : en
Pages : 64
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Book Description
An experimental apparatus for the examination of a planar, virtually strain-rate-free diffusion flame in microgravity has been designed and fabricated. Such a diffusion flame is characterized by relatively large spatial scale and high symmetry (to facilitate probing), and by relatively long fluid-residence time (to facilitate investigation of rates associated with sooting phenomena). Within the squat rectangular apparatus, with impervious, noncatalytic isothermal walls of stainless steel, a thin metallic splitter plate subdivides the contents into half-volumes. One half-volume initially contains fuel vapor diluted with an inert gas, and the other, oxidizer diluted with another inert gas-so that the two domains have equal pressure, density, and temperature. As the separator is removed, by translation in its own plane, through a tightly fitting slit in one side wall, a line ignitor in the opposite side wall initiates a triple-flame propagation across the narrow layer of combustible mixture formed near midheight in the chamber. The planar diffusion flame so emplaced is quickly disrupted in earth gravity. In microgravity, the planar flame persists, and travels ultimately into the half-volume containing the stoichiometrically deficient reactant; the flame eventually becomes extinguished owing to reactant depletion and heat loss to the walls.Fendell, Francis and Rungaldier, HaraldGlenn Research CenterFLAME PROPAGATION; COMBUSTION; DIFFUSION FLAMES; MICROGRAVITY; THIN PLATES; BURNOUT; DEPLETION; STAINLESS STEELS; SYMMETRY; STRAIN RATE; IGNITION
Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 456
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Zafar Said
Publisher: Elsevier
ISBN: 0323858368
Category : Technology & Engineering
Languages : en
Pages : 278
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Book Description
Hybrid Nanofluids: Preparation, Characterization and Applications presents the history of hybrid nanofluids, preparation techniques, thermoelectrical properties, rheological behaviors, optical properties, theoretical modeling and correlations, and the effect of all these factors on potential applications, such as solar energy, electronics cooling, heat exchangers, machining, and refrigeration. Future challenges and future work scope have also been included. The information from this book enables readers to discover novel techniques, resolve existing research limitations, and create novel hybrid nanofluids which can be implemented for heat transfer applications. Describes the characterization, thermophysical and electrical properties of nanofluids Assesses parameter selection and property measurement techniques for the calibration of thermal performance Provides information on theoretical models and correlations for predicting hybrid nanofluids properties from experimental properties
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Category : Aeronautics
Languages : en
Pages : 1002
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Author: Sandra Knowles Weller
Publisher: Caister Academic Press Limited
ISBN: 9781904455769
Category : Science
Languages : en
Pages : 0
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Book Description
Alphaherpesviruses are a fascinating group of DNA viruses that includes important human pathogens such as herpes simplex virus type 1 (HSV-1), HSV-2, and varicella-zoster virus (VZV): the causative agents of cold sores, genital ulcerous disease, and chickenpox/shingles, respectively. A key attribute of these viruses is their ability to establish lifelong latent infection in the peripheral nervous system of the host. Such persistence requires subversion of the host's immune system and intrinsic antiviral defense mechanisms. Understanding the mechanisms of the immune evasion and what triggers viral reactivation is a major challenge for today's researchers. This has prompted enormous research efforts into understanding the molecular and cellular biology of these viruses. This up-to-date and comprehensive volume aims to distill the most important research in this area providing a timely overview of the field. Topics covered include: transcriptional regulation, DNA replication, translational control, virus entry and capsid assembly, the role of microRNAs in infection and oncolytic vectors for cancer therapy. In addition there is coverage of virus-host interactions, including apoptosis, subversion of host protein quality control and DNA damage response pathways, autophagy, establishment and reactivation from latency, interferon responses, immunity and vaccine development. Essential reading for everyone working with alphaherpesviruses and of interest to all virologists working on latent infections.
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Category : Artificial satellites in geographical research
Languages : en
Pages : 8
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Author: National Research Council
Publisher: National Academies Press
ISBN: 0309157250
Category : Science
Languages : en
Pages : 199
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Book Description
There is a national need to educate the public about the ocean, coastal resources, atmosphere and climate. The National Oceanic and Atmospheric Administration (NOAA), the agency responsible for understanding and predicting changes in the Earth's environment and conserving and managing coastal and marine resources to meet the nation's economic, social and environmental needs, has a broad mandate to engage and coordinate education initiatives on these topics. Since its creation in 1970, the NOAA has supported a variety of education projects that cover a range of topics related to the agency's scientific and stewardship mission. NOAA uses formal and informal learning environments to enhance understanding of science, technology, engineering and mathematics (STEM) and to advance environmental education. The work of this agency overlaps and compliments the missions of other federal agencies, institutions of higher education, private and nonprofit organizations. Coordination among these agencies and organizations has been challenging. Limited education resources and the inherently global nature of NOAA's mission make strategic partnerships critical in order for the agency to accomplish its goals. Additionally, clear education goals, planning, and strategic use of resources are critical aspects for effective partnerships. NOAA's Education Program: Review and Critique provides a summary of the national education context for NOAA's role in education which is twofold: first is to advance the environmental literacy of the nation, and second is to promote a diverse workforce in ocean, coastal, Great Lakes, atmospheric and climate sciences. The book also describes the strengths and weaknesses of the education strategic plan, the education evaluation approach of the agency and strategies for improving the evaluation process.
Author: Ingvar Sundh
Publisher: CABI
ISBN: 9781780640082
Category : Agricultural microbiology
Languages : en
Pages : 343
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Book Description
Microorganisms are widely used in various beneficial applications, including food, pest control, bioremediation, biodegradation, biofuel processes, and plant symbiosis and growth stimulation. This book provides an overview of the available methodology for safety assessments of microorganisms, including determination of their infectivity and whether they produce toxic or sensitizing substances. Also covered are the regulatory systems in risk assessment and management of microbial products, quarantine legislations, international treaties, the importance of public risk perception and risk reducti
