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The Effect Of Initial Scalar Size On The Mixing Of A Passive Scalar In Grid Generated Turbulence
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Book Synopsis The Effect of Initial Scalar Size on the Mixing of a Passive Scalar in Grid-generated Turbulence by : Ory D. Selzer
Download or read book The Effect of Initial Scalar Size on the Mixing of a Passive Scalar in Grid-generated Turbulence written by Ory D. Selzer and published by . This book was released on 2001 with total page 646 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of Initial Integral Scale on the Mixing of Passive Scalar in Grid-generated Turbulence by : Oleg O. Goushcha
Download or read book The Effect of Initial Integral Scale on the Mixing of Passive Scalar in Grid-generated Turbulence written by Oleg O. Goushcha and published by . This book was released on 2010 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present study is focused on the effect of variation of the size of the large scale structure on the mixing of a passive scalar in nearly homogeneous grid-generated turbulence. A passive scalar is introduced into the flow by means of a grid consisting of closely separated horizontal wires. A set of ten wires is heated by means of an electrical current passed thorough the wires. A temperature change of about 0.7° C is observed just downstream of the wires, which is low enough so the heated fluid can be considered a passive scalar. The mean velocity is held constant at about 6m/s. Free-stream turbulence is produced by means of biplane grids with a mesh size, Mu=2.54cm, 5.08cm, and 10.16cm which leads to corresponding grid Reynolds numbers of 8401, 16802, and 33605, respectively. It is found that the normalized mean temperature plotted as a function of the vertical distance from the centerplane normalized by the half wake width are nearly similar in shape far downstream of the wire grid. The profiles of the normalized root mean square temperature, normalized temperature skewness and kurtosis plotted as a function of the vertical distance from the centerplane normalized by the half wake width are not similar even far downstream of the wire gird for all grids. At moderate distances downstream of the wire grid (for example x/Mu=10 for Mu=2.45cm), the Probability Density Functions show the presence of ambient temperature fluid on the centerplane far downstream of the wire-grid. This can occur when the thermal wake produced by the wire grid "flaps", i.e. the heated wake moves vertically with time without significant mixing.
Book Synopsis Effect of Length Scales on the Mixing of Passive Scalars in Grid Turbulence by : Abdullah MohammadFarid N. Alkudsi
Download or read book Effect of Length Scales on the Mixing of Passive Scalars in Grid Turbulence written by Abdullah MohammadFarid N. Alkudsi and published by . This book was released on 2012 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of passive scalars in turbulence research is a technologically important topic. This study seeks to investigate the effect of the variation of integral length scale, and scalar injector size and separation on turbulent mixing. The study is motivated by devices such as the simple gas turbine pre-mixer where these three relevant length scales are present. Heated wakes of different sizes and separations are produced by heating various sets of thin wires in a horizontal wire grid. The horizontal wire screen is placed downstream of biplane grids of different mesh sizes. Time-resolved velocity and temperature are measured by a dual hot and cold wire probe. Assessments of the effect of the array of thin wires used as the scalar generator on the velocity and scalar fields behind the turbulence grid are presented. The evolution of the profiles of the first four statistical moments of temperature fluctuations across the wake with downstream distance is studied for various scalar injector size and separation for several integral length scales. Specifically, the downstream evolution of a single thermal wake is studied for source sizes that range from less than the Kolmogorov to larger than the integral length scale. Also included in the study the downstream evolution and interaction of two thermal wakes is also presented. For the single wake, the wake growth, sufficiently far from the generator, for all source sizes is found to be consistent with the assumption that the effective diffusivity is constant across the wake. The evolution of the effective diffusivity with downstream distance is found to be independent of the source size and identical to the evolution of the effective diffusivity of a line source in the same velocity field. The effects of changing the velocity integral scale are governed by the effect of the integral scale on the evolution of the effective turbulent diffusivity. Those effects are found to be similar in character to the effect on a line source. The mean scalar of two sources is found to be the sum of the mean of the individual sources. Higher statistical moments show more complex relationships.
Book Synopsis Experimental Studies of Homogeneous Passive Scalars in Grid-generated Turbulence by : Anuvat Sirivat
Download or read book Experimental Studies of Homogeneous Passive Scalars in Grid-generated Turbulence written by Anuvat Sirivat and published by . This book was released on 1983 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fractal Flow Design: How to Design Bespoke Turbulence and Why by : Yasuhiko Sakai
Download or read book Fractal Flow Design: How to Design Bespoke Turbulence and Why written by Yasuhiko Sakai and published by Springer. This book was released on 2016-06-21 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on turbulent flows generated and/or influenced by multiscale/fractal structures. It consists of six chapters which demonstrate, each one in its own way, how such structures and objects can be used to design bespoke turbulence for particular applications and also how they can be used for fundamental studies of turbulent flows.
Book Synopsis Mixing of a Passive Scalar in Isotropic and Sheared Homogeneous Turbulence by : E. Shirani
Download or read book Mixing of a Passive Scalar in Isotropic and Sheared Homogeneous Turbulence written by E. Shirani and published by . This book was released on 1981 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to calculate the velocity and passive scalar fields in homogeneous turbulent flows, the three-dimensional, time-dependent equations of motion and the diffusion equation have been solved numerically.
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1980 with total page 932 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Passive Scalar Dispersion and Mixing in Isotropic Grid Turbulence and in a Turbulent Jet by : Chenning Tong
Download or read book Passive Scalar Dispersion and Mixing in Isotropic Grid Turbulence and in a Turbulent Jet written by Chenning Tong and published by . This book was released on 1995 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Small-scale Structure of Passive Scalar Mixing in Turbulent Boundary Layers by : Lakshmi P. Dasi
Download or read book The Small-scale Structure of Passive Scalar Mixing in Turbulent Boundary Layers written by Lakshmi P. Dasi and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective is to contribute to several issues regarding the traditional view of the local structure of passive scalar fields: (1) probability density function (PDF) of the scalar concentration and scalar gradient, (2) the scalar power spectrum, (3) the structure functions, and (4) correlation functions and multi-point correlators. In addition, the research provides a geometric description of two-dimensional transects of the passive scalar iso-surfaces using the tools of fractal geometry. The local structure is analyzed as a function of large-scale anisotropy, intermittency factor, Reynolds number, and initial condition of the scalar injection. Experiments were performed in the bed boundary layer produced by a uniform depth open channel flow of water in a tilting flume for Re [subscript lambda] = 63, 94, and 120. A small nozzle iso-kinetically delivers a passive scalar of high Schmidt number (Sc = 1000) at mid-depth to generate the turbulent scalar field. Three nozzle diameters are used to study the effects of the injection length scale. High-resolution planar laser induced fluorescence (PLIF) technique is used to measure the scalar field. The local structure far from isotropic and is influenced even at the smallest scales by large-scale anisotropy, initial injection length scale and the Reynolds number of the flow. The PDF of the scalar fluctuations is non-Gaussian and dependent on large-scale anisotropy. The PDF of scalar gradients show the influence of large-scale anisotropy on the structure at the smallest scales. The spectrum of the scalar field deviates from the k [superscript -5/3] prediction in the inertial convection regime and is dependent on large-scale anisotropy, external intermittency, and low Reynolds number. There is no evidence of Batchelors k [superscript -1] scaling law. The scaling exponents of the even-ordered structure functions appear to be inversely correlated with the kurtosis of the scalar fluctuations. The fractal geometry of the two dimensional transects of passive scalar iso-surfaces is scale dependent. The fractal dimension is 1.0 at the smallest length scale and increases in a universal manner in the viscous-convective regime. The coverage length underestimate reflects this universal behavior with practical significance. The lacunarity function shows that the instantaneous scalar field is most in-homogenous around the Kolmogorov scale.
Book Synopsis Towards Understanding Turbulent Scalar Mixing by : Sharath S. Girimaji
Download or read book Towards Understanding Turbulent Scalar Mixing written by Sharath S. Girimaji and published by . This book was released on 1992 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis IUTAM Symposium on Turbulent Mixing and Combustion by : Andrew Pollard
Download or read book IUTAM Symposium on Turbulent Mixing and Combustion written by Andrew Pollard and published by Springer Science & Business Media. This book was released on 2013-03-14 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goals of the Symposium were to draw together researchers in turbulence and combustion so as to highlight advances and challenge the boundaries to our understanding of turbulent mixing and combus tion from both experimental and simulation perspectives; to facilitate cross-fertilization between leaders in these two fields. These goals were noted to be important given that turbulence itself is viewed as the last great problem in classical physics and the addition of chemical reaction amplifies the difficulties enormously. The papers that have been included here reflect the richness of our subject. Turbulence is rich and complex in its own right. And, its inner structure, hidden in the morass of scales, large and small, can dominate transport. Earlier IUTAM Symposia have considered this field, Eddy Structure Identification in Free Turbulent Flows, Bonnet and Glauser (eds) 1992 and Simulation and Identification of Organized Structures in Flows, Sorensen, Hopfinger and Aubry (eds) 1997. The combustion community is well served by its specialized events, most notable is the bi annual International Combustion Symposium, held under the auspices of the Combustion Institute. Mixing is often considered somewhere in between these two. This broad landscape was addressed in this Sym posium in a somewhat temporal linear fashion of increasing complexity. The lectures considered the many challenges posed by adding one ele ment to the base formed by others: turbulence and turbulent mixing in the absence of combustion through to turbulent mixing dominated by chemistry and combustion.
Book Synopsis Theoretical Investigation of a Passive Scalar Such as Temperature in Isotropic Turbulence by : Robert McDougall Kerr
Download or read book Theoretical Investigation of a Passive Scalar Such as Temperature in Isotropic Turbulence written by Robert McDougall Kerr and published by . This book was released on 1981 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analysis and Application of Decaying Turbulence with Initial Fractal Geometry by : Hiroki Suzuki
Download or read book Analysis and Application of Decaying Turbulence with Initial Fractal Geometry written by Hiroki Suzuki and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this paper, we address high-Schmidt-number (Sc) scalar turbulent mixing that results from grid-generated turbulence using the initial fractal geometry of the velocity profile. More specifically, as was proposed in our recent study, we adopt an initial flow field generated by a fractal grid and apply it to a water channel experiment based on a high-Sc-number scalar-mixing layer in order to create grid-generated turbulence, and thus solve our current research problem. The high-Sc-number scalar and velocity fields of the grid-generated turbulence are then measured using planar laser-induced fluorescence (PLIF) and particle image velocimetry (PIV), respectively. By means of fractal analysis, this study specifically addresses the turbulent mixing phenomena in which the fractal dimension of the mixing interface of an observed high-Sc-number scalar field is calculated. Additionally, we discuss the efficiency of using fractal grids as devices for enhancing high-Sc-number scalar turbulent mixing by observing turbulent intensities and dissipation by PIV.
Book Synopsis Mixing of a Passive Scalar in Isotropic and Sheared Homogeneous Turbulence by : Ebrahim Shirani-Chaharsughi
Download or read book Mixing of a Passive Scalar in Isotropic and Sheared Homogeneous Turbulence written by Ebrahim Shirani-Chaharsughi and published by . This book was released on 1981 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Passive Scalar Mixing in Compressible, Isotropic Turbulence by :
Download or read book Passive Scalar Mixing in Compressible, Isotropic Turbulence written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Turbulent Mixing of Passive Scalars at High Schmidt Number by : Shuyi Xu
Download or read book Turbulent Mixing of Passive Scalars at High Schmidt Number written by Shuyi Xu and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A numerical study of fundamental aspects of turbulent mixing has been performed, with emphasis on the behavior of passive scalars of low molecular diffusivity (high Schmidt number Sc). Direct Numerical Simulation is used to simulate incompressible, stationary and isotropic turbulence carried out at high grid resolution. Data analyses are carried out by separate parallel codes using up to 10243 grid points for Taylor-scale Reynolds number (R(lambda) up to 390 and Sc up to 1024. Schmidt number of order 1000 is simulated using a double-precision parallel code in a turbulent flow at a low Reynolds number of R (lambda) 8 to reduce computational cost to achievable level. The results on the scalar spectrum at high Schmidt numbers appear to have a ...
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1998 with total page 984 pages. Available in PDF, EPUB and Kindle. Book excerpt:
