Download or read book An Experimental Investigation of the Velocity Field of and Scalar Dispersion in the Shearless Turbulence Mixing Layer written by Srinivas V. Veeravalli and published by . This book was released on 1989 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Investigation of the Near and Far Fields of the Turbulent Velocity and Thermal Mixing Layer in Nearly Homogeneous Turbulence written by Mohsen Sayed Mohamed and published by . This book was released on 1989 with total page 858 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Studies of Scalar Transport and Mixing in a Turbulent Shear Flow written by Amir Behnamian and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: High resolution, multi-sensor, hot/cold-wire measurements were made in passively heated, uniformly sheared turbulence in a wind-tunnel. Measurements were focused on terms that are important for modelling of the scalar probability density function (PDF) equation. Unlike previous studies, which considered a single combination of velocity and scalar fields at a time, in this study three different scalar fields were investigated in the same nearly homogeneous turbulence with three passively superimposed temperature fields, namely a transversely homogeneous temperature field with a uniform mean gradient, and two inhomogeneous temperature fields, the plume of a heated line source and a thermal mixing layer. The use of the same uniformly sheared flow allowed the isolation of the effects of scalar inhomogeneity and initial conditions by evaluating the results in the three scalar fields. Thus, the measurements covered a wide range of scalar field conditions and set the ground for a conclusive comparison. For the homogeneous scalar field, results conformed with the literature: the scalar PDF was essentially Gaussian; the conditional expectations of velocities upon the scalar value were approximately linear; and the conditional expectation of the scalar dissipation rate upon the scalar value was mildly anisotropic and had a shape that was similar to those of any of its three parts, which justifies the use of the streamwise part as a surrogate for the total. All these properties behaved very differently in two inhomogeneous scalar fields, the thermal mixing layer and the plume of a heated line source: the scalar PDFs were distinctly sub-Gaussian; the conditional velocity expectations were non-linear functions of the scalar value; and the conditional scalar dissipation rates were very strongly anisotropic, as well as depending on the scalar value in fashions that differed strongly from those of any of their three parts.
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:
Download or read book Preliminary Experimental Investigation of Effect of Free stream Turbulence on Turbulent Boundary layer Growth written by S. J. Kline and published by . This book was released on 1960 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental Investigation of Scalar Mixing in Supersonic Turbulent Shear Layers written by Noel T. Clemens and published by . This book was released on 1991 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental Study of the Shearless Grid Generated Turbulence Mixing Layer written by Eliko Ikeda and published by . This book was released on 1988 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental Investigation of the Effect of Free Stream Turbulence on the Turbulent Boundary Layer Growth written by Alexander Vladimir Lisin and published by . This book was released on 1958 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
Download or read book Scalar Dispersion in Turbulent Open Channel Flows Over Smooth and Rough Beds written by Zhuo Chen and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Study of passive dispersion of a neutral scalar in turbulentflows is highly important due to its numerous applications in the areas of turbulent flow visualization, turbulent heat transfer and transport of pollutants and other substances in the environment. Over the past few decades, many analytical, numerical, and experimental studies have been conducted on this topic to obtain a better understanding of the physical process. In the present work, Large Eddy Simulations (LES) of scalar dispersion in turbulent flow over smooth and rough channels is conducted to contribute to the further understanding of the relation between the turbulent velocity field and the concentration field. The LES results from the present work showed good agreement with a recently com-pleted experimental study(Rahman and Webster [2005]). An in-depth comparison of in-stantaneous concentration and velocity fields revealed thecorrelation between scalar dis-persion and coherent structures of the turbulent flow. Also, a three dimensional visual-ization of concentration iso-surfaces at different instants provided a good picture of the concentration structures transported as a result of hairpin vortices of turbulent flow, which is quite difficult to accomplish using experimental studies.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1990 with total page 750 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analytical and Experimental Investigation of a Turbulent Mixing Layer of Different Gases in a Pressure Gradient written by Manuel Rebollo Rebollo and published by . This book was released on 1973 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Experiments in Homogeneous Turbulence written by Robert Sugden Rogallo and published by . This book was released on 1981 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experiments on Passive Scalar Mixing in Turbulent Flows with Different Velocity and Scalar field Boundary Conditions written by Jason Lepore and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The findings suggest that both the mean flow shear and turbulence intensity of the velocity field play an important role in determining the mixedness of the scalar field." --
Download or read book An Experimental Investigation of the Small scale Structure of Turbulence in a Curved Mixing Layer written by John C. Wyngaard and published by . This book was released on 1967 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Background Turbulence on the Scalar Field of a Turbulent Jet written by Alejandro Perez Alvarado and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The effect of background turbulence on the scalar field of an axisymmetric turbulent jet is investigated experimentally. The present investigation builds on the work of Gaskin et al. (2004), who studied the concentration and velocity fields of a plane jet in a shallow coflow with different turbulence levels and Khorsandi et al. (2013), who studied the velocity field of an axisymmetric turbulent jet emitted into a turbulent background. Different driving algorithms for a large RJA were tested and the statistics of the turbulence generated downstream of the RJA were compared to characterize the algorithms' performance. Variations in the spatial configuration of jets operating at any given instant, as well as in the statistics of their on/off times were studied. The algorithm identified as RANDOM generated the closest approximation of zero-mean-flow homogeneous isotropic turbulence. The flow generated by the RANDOM algorithm had a relatively high turbulent Reynolds number (ReT = uTl/[nu] = 2360, where uT is a characteristic RMS velocity, l is the integral length scale of the flow, [nu] is the kinematic viscosity of the water) and the integral length scale (l = 11.6 cm) is the largest reported to date. Thus, RANDOM algorithm was used to generate the background turbulence for the investigation of scalar mixing within a turbulent jet.The effect of background turbulence on the mixing of a passive scalar within a turbulent jet at different Reynolds numbers was investigated. To this end, planar laser-induced fluorescence was employed to obtain concentration measurements of dye (disodium fluorescein, Schmidt number = 2000) within the jet. Two jet Reynolds numbers (Re=UjD/[nu], where Uj is the jet exit velocity, D is the nozzle diameter and [nu] is the kinematic viscosity of the jet fluid, water) were studied: 10600 and 5800. The resulting statistics of the scalar fields showed that the mean concentrations of jets emitted into turbulent backgrounds were lower than those of jets emitted into a quiescent background near the centerline. However, near the edges of the jet (r/x>0.15), the concentrations were higher for the jets issued into turbulent surroundings. The RMS concentrations of the jet emitted into a turbulent background significantly increased. Examination of the probability density functions of concentration revealed a higher degree of intermittency of the scalar field. The probability of low concentrations increased in the presence of background turbulence although the maximum concentrations were comparable to those of the jet emitted into a quiescent background. Flow visualizations revealed meandering of the jet issued into background turbulence, which is associated with the increased probability of lower concentrations and higher intermittency. Additionally, the widths of the jets emitted into a turbulent background were increased. For the lower jet Reynolds number, the described effects were more evident and the jet structure was destroyed by the background turbulence within the measurement region, resulting in flat radial profiles of both the mean and RMS concentrations. Comparison of the results of the scalar field with those of the hydrodynamic jet of Khorsandi et al. (2013) revealed a similar behavior of the two fields. However, the most significant difference was the larger radial extent of the profiles of mean and RMS concentrations, which resulted from the meandering of the jet and increased transport of scalar by turbulent diffusion. The flow visualizations suggest that the entrainment and mixing in the jet in a turbulent background changes with the destruction of jet structure, from jet driven entrainment to become potentially dominated by i) increased lateral advection of the jet by large scales of the background turbulence during the meandering of the jet, which is subsequently mixed by its smaller scales, and ii) turbulent diffusion that is significantly enhanced by the turbulent background." --
Download or read book Free Turbulent Mixing written by Philip Thomas Harsha and published by . This book was released on 1971 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
