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Author: Ghobad Amini
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659337727
Category :
Languages : en
Pages : 160
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Book Description
The motion of liquid jets ejected from elliptical orifices is studied theoretically and experimentally. In the theoretical part of the study, the linear evolution of initially small disturbances on the inviscid jets is investigated using a three-dimensional analysis. In addition, to study the viscous free-surface flows, an approach based on the Cosserat theory is used. Temporal and spatial analyses are performed and the dispersion equations of waves on the jet column are derived to show the growth rate of disturbances for different modes under various conditions. An equation for the jet profile is suggested which describes the axis-switching phenomenon and breakup for various conditions. The equations are approximated for small and large ellipticities, and well-known dispersion relations of circular and planar jets are retrieved. Experiments are performed to validate the linear results and to investigate the jet velocity profile. Several nozzles with different ellipticities and length to diameter ratios are designed and their behaviors are examined under free (natural) and excited (forced) perturbations.
Author: Ghobad Amini
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659337727
Category :
Languages : en
Pages : 160
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Book Description
The motion of liquid jets ejected from elliptical orifices is studied theoretically and experimentally. In the theoretical part of the study, the linear evolution of initially small disturbances on the inviscid jets is investigated using a three-dimensional analysis. In addition, to study the viscous free-surface flows, an approach based on the Cosserat theory is used. Temporal and spatial analyses are performed and the dispersion equations of waves on the jet column are derived to show the growth rate of disturbances for different modes under various conditions. An equation for the jet profile is suggested which describes the axis-switching phenomenon and breakup for various conditions. The equations are approximated for small and large ellipticities, and well-known dispersion relations of circular and planar jets are retrieved. Experiments are performed to validate the linear results and to investigate the jet velocity profile. Several nozzles with different ellipticities and length to diameter ratios are designed and their behaviors are examined under free (natural) and excited (forced) perturbations.
Author: Ghobad Amini-Baziani
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Yizhong Liao
Publisher:
ISBN:
Category :
Languages : en
Pages : 196
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Book Description
Author: Vigor Young
Publisher: AIAA
ISBN: 9781600864186
Category : Liquid propellant rockets
Languages : en
Pages : 606
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Book Description
Annotation Since the invention of the V-2 rocket during World War II, combustion instabilities have been recognized as one of the most difficult problems in the development of liquid propellant rocket engines. This book is the first published in the United States on the subject since NASA's Liquid Rocket Combustion Instability (NASA SP-194) in 1972. In this book, experts cover four major subject areas: engine phenomenology and case studies, fundamental mechanisms of combustion instability, combustion instability analysis, and engine and component testing. Especially noteworthy is the inclusion of technical information from Russia and China--a first.
Author: S. P. Lin
Publisher: Cambridge University Press
ISBN: 1139439782
Category : Technology & Engineering
Languages : en
Pages : 287
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Book Description
This book, first published in 2003, is an exposition of what we knew about the physics underlying the onset of instability in liquid sheets and jets. Wave motion and breakup phenomena subsequent to the onset of instability are carefully explained. Physical concepts are established through rigorous mathematics, accurate numerical analyses and comparison of theory with experiment. Exercises are provided for students, and these help familiarize the reader with the required mathematical tools. This book further provides a rational basis for designing equipment and processes involving the phenomena of sheet and jet breakup. Researchers interested in transition to turbulence, hydrodynamic stability or combustion will find this book a highly useful resource, whether their background lies in engineering, physics, chemistry, biology, medicine or applied mathematics.
Author: Zhi Wen Lian
Publisher:
ISBN:
Category : Fluids
Languages : en
Pages : 290
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Book Description
Author: Edmund Frederick Goedde
Publisher:
ISBN:
Category : Capillarity
Languages : en
Pages :
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Book Description
Author: Prassanna Sai Ramesh
Publisher:
ISBN:
Category :
Languages : en
Pages : 111
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Book Description
A mathematical model for predicting the breakup length and resultant drop size for a liquid jet emanating from an orifice into a gaseous atmosphere is presented in this thesis. The non-Newtonian viscoelastic liquids are considered owing to their importance in a variety of engineering applications. The viscoelastic liquid rheology is characterized by the Jeffrey's equation. Results for a Newtonian jet are obtained by making the viscoelastic time constants zero in the model. Furthermore, when the liquid viscosity is neglected in the model, the behavior of an inviscid liquid jet can be predicted. The perturbation expansion technique is used to analyze the stability of the liquid jet by imposing a small disturbance on the jet surface and tracking the growth and development of the disturbance. In this temporal analysis, the jet is considered to disintegrate into droplets when the amplitude of the surface disturbance reaches the jet radius. The time taken for the surface deformation to evolve and break the jet, or the breakup time, and the breakup length are calculated. The model is validated by comparing numerical predictions with several theoretical analyses and experimental measurements available in the literature. A parametric study is carried out to investigate the effects of fluid properties (liquid viscosity, liquid elasticity, and time constant ratios), flow conditions (liquid and gas velocities), and disturbance characteristics (initial amplitude and wave number) on the breakup length and resultant drop size. Significant findings are that increase in gas velocity decreases the breakup length and increases the size of the secondary drops formed. Also, jets of higher viscosity liquids have longer breakup lengths. Increasing the liquid elasticity decreases the breakup length and aids in the breakup process. Higher initial disturbance amplitude results in shorter breakup length but the initial amplitude does not significantly affect the resulting drop size.
Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 276
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Book Description
Author: Nicolas M. Nahas
Publisher:
ISBN:
Category : Surface tension
Languages : en
Pages : 122
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Book Description
