Modeling Jets In Cross Flow

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Modeling Jets In Cross Flow

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Author : A. O. Demuren
language : en
Publisher:
Release Date : 1994

Modeling Jets In Cross Flow written by A. O. Demuren and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.

Manipulation And Control Of Jets In Crossflow

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Author : Ann R. Karagozian
language : en
Publisher: Springer
Release Date : 2014-05-04

Manipulation And Control Of Jets In Crossflow written by Ann R. Karagozian and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-05-04 with Technology & Engineering categories.

Fundamental Non-Reactive Jets in Crossflow and Other Jet Systems; Background on Modeling, Dynamical Systems, and Control; Reactive Jets in Crossflow and Multiphase Jets; Controlled Jets in Crossflow and Control via Jet Systems;

Direct Numerical Simulations And Modeling Of Jets In Crossflow

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Author : Suman Muppidi
language : en
Publisher:
Release Date : 2006

Direct Numerical Simulations And Modeling Of Jets In Crossflow written by Suman Muppidi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.

Numerical Modeling Of An Impinging Jet In Cross Flow

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Author : D. Bray
language : en
Publisher:
Release Date : 1990

Numerical Modeling Of An Impinging Jet In Cross Flow written by D. Bray 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.

Entrainment Processes For A Jet In Cross Flow

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Author :
language : en
Publisher:
Release Date : 2020

Entrainment Processes For A Jet In Cross Flow written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with Jets categories.

A jet in cross flow (JICF) is examined experimentally by injecting a stream of air into crossing fluid with an aim into quantifying entrainment process and downstream evolution. The behavior of JICF is important to fields ranging from turbine-blade cooling to smokestack pollution and volcanic eruption dynamics. Existing simplified volcanic plume models are tested; most importantly, the near-field contributions of complex interconnected vortex systems, which present significant uncertainties because they assume negligible turbulence. While jets in irrotational cross-flow have been investigated, this analysis has focused on the interaction between a turbulent jet in low and highly turbulent cross-flow created by an active grid. Instantaneous velocity fields were collected over seven planes using particle image velocimetry (PIV). A center-plane (x-y) and six planes parallel to the floor (x-z) highlight the interaction and resulting vortex systems. Various jet-to-cross-flow velocity ratios, Rv, were collected for each plane, which allow for computation of mean statistics and Reynolds stresses. Analysis was focused in five stages: a) identification of differences in the development of the jet across various inflow conditions, b) analysis of the vortex systems through transport and critical points analysis, c) decomposition of the flow structures to identify and remove the highest-order contributions to turbulence kinetic energy and d) extraction of reduced order modeling closure terms and e) optimization of closure terms for the simplified one-dimensional model, Plumeria. These five stages provided a comprehensive description of the role of cross-flow turbulence on the development of JICF. Noteworthy findings include significant changes in wake recovery and the near-wake recirculation region that impacted near-field entrainment; increased entrainment for high cross-flow turbulence after the collapse of the potential core due to increased engulfment and viscous nibbling between turbulent fluids; the presence of shear layer and wake vortices through critical point analysis; and the absence of entrainment and shear layer expansion near the exit. Most importantly, the negligible entrainment near the exit and impact of small scale turbulent features that must be included for any specific model to yield reasonable predictions is highlighted. By laying the foundation for a more nuanced approach to JICF, it is possible to more precisely summarize the complex features observed in this work through simplified descriptions that can be of benefit to both engineering design and geophysical modeling.

Analysis Of An Entrainment Model Of The Jet In A Crossflow

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Author : H. S. Chang
language : en
Publisher:
Release Date : 1972

Analysis Of An Entrainment Model Of The Jet In A Crossflow written by H. S. Chang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with Jets categories.

Negatively Buoyant Jets In A Cross Flow

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Author : Jerry Lee Anderson
language : en
Publisher:
Release Date : 1973

Negatively Buoyant Jets In A Cross Flow written by Jerry Lee Anderson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Thermal pollution of rivers, lakes, etc categories.

"Negatively buoyant jets, or sinking jets, can be observed in many problems of pollutant discharge. Any chemical waste that is heavier than the receiving water into which it is discharged may act as a negatively buoyant jet. In addition, when water is taken from the hypolimnion of a deep lake or reservoir and used as cooling water, the temperature, and consequently, the discharge may behave like a negatively buoyant jet. Two existing jet diffusion models have been utilized to predict the trajectory and dilution of a positively buoyant jet, or a rising jet, and have been modified to account for the sinking effect. Twenty-four experimental investigations were conducted involving different combinations of densimetric Froude number, velocity ratios, and initial angle of discharge. Salt was used as the tracer, yielding a fluid that was denser than the ambient receiving water and facilitated measuring concentration profiles of the jet plume. The coefficient of entrainment, the major mechanism of dilution, was determined as a function of the densimetric Froude number, velocity ratio, and initial angle of discharge. The reducted drag coefficient was chosen as zero for both models since any other value would predict a trajectory whose rise would be less than experimentally observed. For all angles of discharge the entrainment coefficient increased with a decrease in the velocity ratio and with an increase in densimetric Froude number. Additionally, there was a marked decrease in the entrainmnet coefficient with a decrease in the initial angle of discharge."--Page ii.

Agard Conference Proceedings

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Author : North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development
language : en
Publisher:
Release Date : 1993

Agard Conference Proceedings written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Aeronautics categories.

A Numerical Model Of A Turbulent Jet In A Crossflow

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Author : Michael J. Neely
language : en
Publisher:
Release Date : 1988

A Numerical Model Of A Turbulent Jet In A Crossflow written by Michael J. Neely and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with categories.

Planar Laser Induced Fluorescence Experiments And Modeling Study Of Jets In Crossflow At Various Injection Angles

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Author : Luke Zimmerman Thompson
language : en
Publisher:
Release Date : 2015

Planar Laser Induced Fluorescence Experiments And Modeling Study Of Jets In Crossflow At Various Injection Angles written by Luke Zimmerman Thompson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.

Planar Laser Induced Fluorescence (PLIF) with acetone seeding was applied to measure the scalar fields of an axisymmetric freejet and an inclined jet-in-crossflow as applicable to film cooling. From the scalar fields, jet-mixing and trajectory characteristics were obtained. In order to validate the technique, the canonical example of a nonreacting freejet of Reynolds Numbers 900-9000 was investigated. Desired structural characteristics were observed and showed strong agreement with computational modeling. After validating the technique with the axisymmetric jet, the jet-in-crossflow was tested with various velocity ratios and jet injection angles. Results indicated the degree of wall separation for different injection angles and demonstrate both the time-averaged trajectories as well as select near-wall concentration results for varying jet momentum fluxes. Consistent with literature findings, the orthogonal jet trajectory for varying blowing ratios collapsed when scaled by the jet-to-freestream velocity ratio and hole diameter, rd. Similar collapsing was demonstrated in the case of a non-orthogonal jet. Computational Fluid Dynamic (CFD) simulations using the OpenFOAM software was used to compare predictions with select experimental cases, and yielded reasonable agreement. Insight into the importance and structure of the counter rotating vortex pair and general flow field turbulence was highlighted by cross validation between CFD and experimental results.