Structure and Control of a Particle-laden Coaxial Jet with and Without Annular Swirl

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ISBN 13 :
Total Pages : 284 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Structure and Control of a Particle-laden Coaxial Jet with and Without Annular Swirl by : Stanford University. Thermosciences Division. Thermosciences Division

Download or read book Structure and Control of a Particle-laden Coaxial Jet with and Without Annular Swirl written by Stanford University. Thermosciences Division. Thermosciences Division and published by . This book was released on 1994 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Structure and Control of a Particle-laden Jet

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ISBN 13 :
Total Pages : 258 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Structure and Control of a Particle-laden Jet by : Ellen Kathryn Longmire

Download or read book Structure and Control of a Particle-laden Jet written by Ellen Kathryn Longmire and published by . This book was released on 1990 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:

A Numerical Investigation of Skewed Mixing Layers

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ISBN 13 :
Total Pages : 282 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis A Numerical Investigation of Skewed Mixing Layers by : Stanford University. Thermosciences Division. Thermosciences Division

Download or read book A Numerical Investigation of Skewed Mixing Layers written by Stanford University. Thermosciences Division. Thermosciences Division and published by . This book was released on 1995 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Dissertation Abstracts International

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ISBN 13 :
Total Pages : 778 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Dissertation Abstracts International by :

Download or read book Dissertation Abstracts International written by and published by . This book was released on 1995 with total page 778 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Gas-particle Flows

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ISBN 13 :
Total Pages : 462 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Gas-particle Flows by : David E. Stock

Download or read book Gas-particle Flows written by David E. Stock and published by . This book was released on 1995 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Particle-laden Swirling Free Jets

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (86 download)

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Book Synopsis Particle-laden Swirling Free Jets by : Daniel L. Bulzan

Download or read book Particle-laden Swirling Free Jets written by Daniel L. Bulzan and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

American Doctoral Dissertations

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ISBN 13 :
Total Pages : 800 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis American Doctoral Dissertations by :

Download or read book American Doctoral Dissertations written by and published by . This book was released on 1994 with total page 800 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Structure, Mixing, and Dynamics of Controlled Single and Coaxial Jets in Crossflow

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ISBN 13 :
Total Pages : 493 pages
Book Rating : 4.:/5 (122 download)

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Book Synopsis Structure, Mixing, and Dynamics of Controlled Single and Coaxial Jets in Crossflow by : Elijah Weston Harris

Download or read book Structure, Mixing, and Dynamics of Controlled Single and Coaxial Jets in Crossflow written by Elijah Weston Harris and published by . This book was released on 2020 with total page 493 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation describes an experimental study of the instability, structural, dynamical, and mixing characteristics of jets in crossflow (JICF). Constituent species of the jet fluid were nitrogen and helium, with additional seeding of tracer particulates for implementation in non-intrusive laser diagnostics of acetone planar laser induced fluorescence (PLIF) imaging, and particle image velocimetry (PIV). Various jet-to-crossflow momentum flux ratios in the range of $61\leq J\leq5$ were investigated for three alternative flush mounted circular contracting nozzle injector configurations: a small nozzle ($D=4.04~mm$) passively augmented by a small triangular tab placed about the jet exit periphery, a large nozzle ($D=7.59~mm$) actively augmented by axisymmetric excitation of the jet flow, and a coaxial nozzle ($D=3.81~mm$) with varying degrees of counterflow applied in the outer annulus. Hotwire anemometry was implemented for investigations of the instabilities along the upstream and downstream shear layers of the jet flow, in addition to more in depth analysis of the dynamics of the flow from application of time series analysis techniques to the signal. PLIF imaging served to characterize the JICF by providing qualitative visualizations of the flowfield, and quantitative measurements of the scalar field concentrations and mixing metrics, along both the centerplane and cross-sectional planes of the developing jet. PIV provided determination of the velocity and vorticity fields, along with further investigation of the flow dynamics from proper orthogonal decomposition (POD) analysis, again from both the centerplane and cross-sectional planes of the developing jet. Flow conditions corresponding to a naturally absolutely unstable (AU) upstream shear layer (USL) ($J = 7$) and a convectively unstable (CU) condition ($J = 61$) with jet Reynolds numbers of $Re_j=2300$ were explored for PLIF imaging of the tabbed JICF. Tab location was seen in some cases to significantly alter shear layer instabilities, especially for the case with $J = 7$. Yet acetone planar laser induced fluorescence (PLIF) imaging revealed that more substantive structural changes could be realized with tab placement for the case where $J = 61$. Tab locations with the greatest influence appeared to be consistent with wavemaker regions predicted in numerical simulations of the round transverse jet by \cite{Regan}, providing evidence for the potential to tailor local shear layer rollup, jet structure, and mixing via simple passive geometrical alterations. For the PIV imaging different $J$ values were explored, ranging from naturally AU USL, for $J = 5$ and 8, to naturally CU conditions, for $J = 20$ and 41, with $Re_j=1900$. Placement of the tab at or near the upstream region of the jet exit caused a delay in shear layer rollup and, as quantified from the PIV, a reduction in USL vorticity associated with a thickening of the upstream jet momentum thickness. Tab placement was observed to have a symmetrizing influence on nearfield cross-sectional vorticity dynamics at high and low $J$ values, though specific tab locations had differing degrees of influence for different flow conditions. Proper orthogonal decomposition (POD) modes extracted from centerplane velocity field measurements showed significant influence of tab placement on jet upstream as well as wake structures, depending on $J$. Phase portraits extracted from POD mode coefficient plots produced periodic (circular) shapes for tab placement corresponding to conditions for which the USL was determined to be absolutely unstable. Flow conditions corresponding to a naturally AU USL ($J = 7$) and a CU condition ($J = 10$) with $Re_j=1800$ were explored for PLIF imaging of the axisymmetrically excited JICF. Implementation of a novel double-pulse waveform demonstrated significant enhancement of the quantified jet mixing, where the most significant alterations was seen for forcing waveforms which generated nearfield vortical interactions and breakdown. The same forcing waveform yielded differences between the AU and CU jets resulting from changes to the formation number of the vortex rings as suggested by \cite{Sau_10}, which resulted in alterations in the celerity, circulation, and nearfield interaction of said vortex rings. Separate investigations treated a jet with a stronger AU USL ($J=6$) to comparing the novel double-pulse forcing with sinusoidal and square wave excitation of the jet. Synchronization analysis demonstrated dramatic improvement in the ability of the jet to lock-in to the forcing when a square or double-pulse waveform was implemented. Additional Van der Pol oscillator modeling of Fourier approximated square wave forcing suggested greater significance was seen in the proximity of the harmonics to the natural instability of the jet compared to the actual coherence of the waveform, analogoous to findings by \cite{Sau_10}. Interestingly, PIV-based POD further suggested the nearfield dynamics and efficacy of mixing were heavily dependent upon the vortex rings which were formed, in some cases quite independent of the state of synchronization to the applied forcing. Application of a quasiperiodic forcing significantly improved the mixing without significantly altering the jet structure. For the coaxial JICF, a single flow condition corresponding to a CU USL with a naturally highly asymmetric cross-section ($J = 41$), at $Re_j=1900$, was explored with PLIF and PIV imaging. Suction was applied locally in the upstream and downstream edges of the jet in order to alter the jet shear layer instabilities and vortex dynamics. Indeed, hotwire based spectral characteristics along the USL demonstrated the jet transitioned to an AU flow with strong suction upstream. PIV-based POD also depicted significant enhancement of mode structures along the USL of the jet. Hotwire spectral measurements detected little alteration to the USL with suction applied in the downstream of the jet, where the jet remained CU even with strong suction. However, PIV-based POD dynamics depicted significant enhancement of structures downstream which resembled upright wake vortices, and appeared coupled with the vortex rollup along the downstream of the jet. Interestingly, the corresponding cross-sectional CVP structure was made quite symmetric with the suction applied both upstream or downstream of the jet, suggestive that the suction applied along the symmetry plane of the jet was able to overcome the jet's natural susceptibility to asymmetric perturbations (\cite{Alves_2}), and further supported the suggested wavemaker region for a CU jet purported by \cite{Regan}. Mixing metrics determined significant enhancement in mixing due to the applied suction, further establishing agreement in the correlation between the strength of the shear layer dynamics, symmetry of the cross-sectional CVP, and the resulting jet mixing.

Spatial Instabilities and Particle Distributions in Particle-laden Swirling Jets

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ISBN 13 :
Total Pages : 292 pages
Book Rating : 4.:/5 (486 download)

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Book Synopsis Spatial Instabilities and Particle Distributions in Particle-laden Swirling Jets by : Zhubin Zhang

Download or read book Spatial Instabilities and Particle Distributions in Particle-laden Swirling Jets written by Zhubin Zhang and published by . This book was released on 1999 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Control of Mixing and Concentration of High-speed Particle-laden Jet Using Micro-jets

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)

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Book Synopsis Control of Mixing and Concentration of High-speed Particle-laden Jet Using Micro-jets by : M. Amitay

Download or read book Control of Mixing and Concentration of High-speed Particle-laden Jet Using Micro-jets written by M. Amitay and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Particle-laden Weakly Swirling Free Jets

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ISBN 13 :
Total Pages : 464 pages
Book Rating : 4.:/5 (819 download)

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Book Synopsis Particle-laden Weakly Swirling Free Jets by : Daniel L. Bulzan

Download or read book Particle-laden Weakly Swirling Free Jets written by Daniel L. Bulzan and published by . This book was released on 1988 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Applied mechanics reviews

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ISBN 13 :
Total Pages : 400 pages
Book Rating : 4.3/5 (243 download)

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Book Synopsis Applied mechanics reviews by :

Download or read book Applied mechanics reviews written by and published by . This book was released on 1948 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:

International Aerospace Abstracts

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ISBN 13 :
Total Pages : 974 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis International Aerospace Abstracts by :

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:

AIAA Journal

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ISBN 13 :
Total Pages : 1224 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis AIAA Journal by : American Institute of Aeronautics and Astronautics

Download or read book AIAA Journal written by American Institute of Aeronautics and Astronautics and published by . This book was released on 1998 with total page 1224 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Multiphase Flows with Droplets and Particles

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Publisher : CRC Press
ISBN 13 : 1439840512
Total Pages : 509 pages
Book Rating : 4.4/5 (398 download)

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Book Synopsis Multiphase Flows with Droplets and Particles by : Clayton T. Crowe

Download or read book Multiphase Flows with Droplets and Particles written by Clayton T. Crowe and published by CRC Press. This book was released on 2011-08-26 with total page 509 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the publication of the first edition of Multiphase Flow with Droplets and Particles, there have been significant advances in science and engineering applications of multiphase fluid flow. Maintaining the pedagogical approach that made the first edition so popular, this second edition provides a background in this important area of fluid mecha

Coarse Grained Simulation and Turbulent Mixing

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Publisher : Cambridge University Press
ISBN 13 : 1107137047
Total Pages : 481 pages
Book Rating : 4.1/5 (71 download)

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Book Synopsis Coarse Grained Simulation and Turbulent Mixing by : Fenando F. Grinstein

Download or read book Coarse Grained Simulation and Turbulent Mixing written by Fenando F. Grinstein and published by Cambridge University Press. This book was released on 2016-06-30 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reviews our current understanding of the subject. For graduate students and researchers in computational fluid dynamics and turbulence.

A Gallery of Fluid Motion

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Publisher : Cambridge University Press
ISBN 13 : 9780521535007
Total Pages : 128 pages
Book Rating : 4.5/5 (35 download)

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Book Synopsis A Gallery of Fluid Motion by : M. Samimy

Download or read book A Gallery of Fluid Motion written by M. Samimy and published by Cambridge University Press. This book was released on 2004-01-12 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: The visualization of fluid flow has played a major role in the development of fluid dynamics and its applications, from the evolution of flight to tracking weather, and understanding the flow of blood. The Fluid Dynamics Division of the American Physical Society sponsors an annual competition for outstanding images of fluid flow. This volume includes a selection of winners from 1985 to the present. Each image is accompanied by some explanatory text, making the volume an important acquisition for anyone involved in fluid flow research.