Unsteady Effects In Droplet Evaporation And Combustion
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Unsteady Effects In Droplet Evaporation And Combustion
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Author : Antonio Crespo
language : en
Publisher:
Release Date : 1974
Unsteady Effects In Droplet Evaporation And Combustion written by Antonio Crespo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with categories.
An asymptotic analysis is presented for the problem of droplet vaporization in a stagnant atmosphere taking into account the unsteady effects in the gas phase. The ratio of the densities of the ambient gas and of the liquid is considered as a small parameter. The results of the classical quasi-steady theories are recovered in the first approximation, and corrections due to unsteady effects are obtained for the vaporization rate and for the droplet lifetime. The analysis is entended to cover the cases when the vaporization rate is enhanced by a fast irreversible reaction between the fuel vapor and an oxidizer in the ambient gas. The ratio of flame radius to droplet radius is found in many practical cases to vary significantly with time in agreement with experimental results. (Modified author abstract).
Droplet Combustion At High Pressures With Unsteady Effects
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Author : Carlos Sanchez Tarifa
language : en
Publisher:
Release Date : 1972
Droplet Combustion At High Pressures With Unsteady Effects written by Carlos Sanchez Tarifa and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with categories.
To describe subcritical combustion, there are quasisteady theories based on the fact that the ratio of gas density to liquid density, epsilon, is small. At large pressures below critical, epsilon is not too small and unsteady effects become more important. It is found that, far from the droplet, at distances of the order of the droplet radius divided by the square root of epsilon, there is a unsteady region that originates corrections to mass burning rates, given by quasisteady theories, of order square root of epsilon. For most hydrocarbons burning in air the flame is located far from the droplet, and its position is not given, even in first approximation, by quasisteady theories. Unsteady effects are also analyzed for forced convection burning with Peclet numbers of order square root of epsilon. (Author Modified Abstract).
Theoretical And Experimental Studies On Evaporation And Combustion Of Multicomponent Droplets In Reduced Gravity
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Author : Israel Aharon
language : en
Publisher:
Release Date : 1996
Theoretical And Experimental Studies On Evaporation And Combustion Of Multicomponent Droplets In Reduced Gravity written by Israel Aharon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.
Combustion And Flame Propagation In Heterogeneous Systems
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Author :
language : en
Publisher:
Release Date : 1976
Combustion And Flame Propagation In Heterogeneous Systems written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with categories.
This report first summarizes the works carried out on unsteady effects in droplet evaporation and combustion and on the behaviour of hydrazine catalytic thrusters working under steady state conditions. A topic that is presented in more detail, is on the influence of the temperatures of liquid hydrazine and catalyst particle temperatures on the vacuum start characteristics of a reactor. The model used assumes the existence of a liquid front that first advances towards the interior of the catalyst particle by porous action and then recedes towards the exterior. An order of magnitude estimate seems to indicate that during the process, convective heat transfer dominates over conduction, and the analysis shows the existence of a thin thermal front, whose structure is calculated. Then, the liquid penetration is only governed by the initial particle temperature. For low enough initial particle temperatures the thermal front structure reaches the liquid front and the liquid penetration is also influenced by the initial hydrazine temperature.
Droplet Evaporation And Combustion Near A Surface
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Author : Sanjeev Chandra
language : en
Publisher:
Release Date : 1990
Droplet Evaporation And Combustion Near A Surface written by Sanjeev Chandra and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.
Fluid Dynamics And Transport Of Droplets And Sprays
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Author : W. A. Sirignano
language : en
Publisher: Cambridge University Press
Release Date : 2010-01-11
Fluid Dynamics And Transport Of Droplets And Sprays written by W. A. Sirignano and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-01-11 with Science categories.
This book discusses the theoretical foundations of spray and droplet applications relevant to the technology for active control of sprays applied to new products and applications, improved product performance, cost reductions, and improved environmental outcomes. It also covers theory related to power and propulsion; materials processing and manufacturing technologies including droplet-based net form processing, coating, and painting; medication; pesticides and insecticides; and other consumer uses.
Chemical Kinetics In Combustion And Reactive Flows Modeling Tools And Applications
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Author : V. I. Naoumov
language : en
Publisher: Cambridge University Press
Release Date : 2019-08-22
Chemical Kinetics In Combustion And Reactive Flows Modeling Tools And Applications written by V. I. Naoumov and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-08-22 with Science categories.
Introduces advanced mathematical tools for the modeling, simulation, and analysis of chemical non-equilibrium phenomena in combustion and flows, following a detailed explanation of the basics of thermodynamics and chemical kinetics of reactive mixtures. Researchers, practitioners, lecturers, and graduate students will find this work valuable.
Analysis Of Droplet Combustion A Theoretical Approach
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Author : Shah Shahood Alam
language : en
Publisher: LAP Lambert Academic Publishing
Release Date : 2015-03-23
Analysis Of Droplet Combustion A Theoretical Approach written by Shah Shahood Alam and has been published by LAP Lambert Academic Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-03-23 with categories.
The findings of this work provides an insight into the fundamental aspects of liquid droplet combustion modelling by developing different droplet sub models. An unsteady, spherically symmetric, sub critical, single component gas phase model is developed first and tested for various ambient conditions of temperature, pressure, composition and fuels.It is further extended to include the effects of convection, droplet heating and emissions.A high pressure droplet vaporization model is evolved in view of the supercritical vaporization occuring in diesel engines and liquid rockets.Also, simple and detailed multi component droplet vaporization/combustion models are developed, since commercial fuels used in engines are multi component fuels.The discrete droplet sub models are simple and realistic requiring less computation time and therefore feasible for their implementation in spray combustion codes where CPU economy is vital.
Applied Mechanics Reviews
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Author :
language : en
Publisher:
Release Date : 1974
Applied Mechanics Reviews written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with Mechanics, Applied categories.
Nasa Technical Memorandum
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Author :
language : en
Publisher:
Release Date : 1988
Nasa Technical Memorandum written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Aeronautics categories.