Spray Flame Dynamics in an Oscillating Flow Field - a Computational Study PDF Download
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Author: Itay Moshe
Publisher:
ISBN:
Category :
Languages : en
Pages : 134
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Book Description
Author: Itay Moshe
Publisher:
ISBN:
Category :
Languages : en
Pages : 134
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Book Description
Author: Elazar Barak
Publisher:
ISBN:
Category :
Languages : en
Pages : 168
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Book Description
Author: Bart Merci
Publisher: CRC Press
ISBN: 9781032065847
Category : Combustion engineering
Languages : en
Pages : 0
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Book Description
- written by world leading experts in the field - contains many worked-out examples, taken from daily life fire related practical problems - covers the entire range from basics up to state-of-the-art computer simulations of fire and smoke related fluid mechanics aspects, including the effect of water - provides extensive treatment of the interaction of water sprays with a fire-driven flow - contains a chapter on CFD (Computational Fluid Dynamics), the increasingly popular calculation method in the field of fire safety science
Author: W. A. Sirignano
Publisher: Cambridge University Press
ISBN: 9780521630368
Category : Science
Languages : en
Pages : 344
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Book Description
An authoritative review of the science and technology of droplets and sprays.
Author:
Publisher:
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:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 974
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Author: James Stephen Kistler
Publisher:
ISBN:
Category :
Languages : en
Pages : 210
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Author: Zili Huang
Publisher:
ISBN:
Category : Combustion
Languages : en
Pages : 202
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Book Description
In this dissertation, the response of a premixed flame to time-dependent strained flow fields is investigated. Because of the potential application to turbulent combustion modeling, the main focus is on the particular case of a flame in stagnation point flow with an imposed oscillatory strain rate. The flame is modeled as a hydrodynamic discontinuity separating burned from unburned gasses. To complete the formulation of the problem, conditions relating the fluid variables across the flame front are needed, as is a flame speed equation that determines the evolution of the discontinuity. These conditions are derived through asymptotic analysis of the flame structure. In the first part of this dissertation, an existing hydrodynamic model is employed to assess flame response to oscillating stagnation point flow. The model is valid for near-equidiffusional conditions, i.e. for near-unity Lewis numbers. Under these conditions, the flame speed varies linearly with strain. Unlike previous theoretical investigations, the present formulation places no restrictions on the amplitude of the oscillations, and we account for the full interaction between the flame and the flow. Solutions are constructed by a combination of asymptotic and numerical methods. Results regarding flame response are in agreement with previous experiments and studies. We also obtain the following results as a consequence of the underlying time-periodic flow: (a) the mean flame position is shifted upstream from the steady state location, (b) a region of reverse flow appears immediately ahead of the flame front during part of each cycle, and (c) there is a maximum amplitude of oscillation beyond which the flame fails to exist. These results are most pronounced at high frequencies and agree with the asymptotic solution constructed in that regime. In the second part of this dissertation, a new model is derived which exhibits a nonlinear dependence of flame speed on strain. The model is valid for arbitrary Lewis number, and unlike previous models, it allows for an unsteady flame structure. Asymptotic methods are used to construct solutions across the narrow flame zone (and reaction zone), and asymptotic matching then yields the nonlinear flame speed equation. The new model is then employed to investigate flame response to unsteady strained flows. Our results predict that the flame becomes most sentive to fluctuations in the flow as steady state extinction conditions are approached. Also, at high frequency the flame response is the same, regardless of the mixture properties. These results are in good agreement with experiments.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 492
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Book Description
Author: Meng Wai Woo
Publisher: CRC Press
ISBN: 9781498724647
Category : Computational fluid dynamics
Languages : en
Pages : 0
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Book Description
The book shows how to numerically capture important physical phenomena within a spray drying process using the CFD technique. It includes numerical strategies to describe these phenomena, collated from research work and CFD industrial consultation. Along with showing how to set up models, the book helps readers identify the capabilities and uncertainties of the CFD technique for spray drying. It covers basics of CFD, airflow modeling, atomization and particle tracking, droplet drying, quality modeling, agglomeration and wall deposition modeling, and simulation validation techniques. It answers questions related to common challenges in industrial applications.
