Download or read book Turbulent Pipe Flow with Swirl written by Wiendelt Steenbergen and published by . This book was released on 1995 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Impact of Swirl in Turbulent Pipe Flow written by Akay Aydin Islek and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The impact of swirl (i.e., flow with axial and azimuthal velocity components) on the turbulent flow in a pipe is studied using two-component laser-Doppler velocimetry (LDV). There are practical motivations for the flow geometry. For example, previous studies demonstrate that introducing swirl in the tube bank of a paper machine headbox can significantly increase mixing, and hence increase fiber dispersion and orientation isotropy in the finished paper product. The flow characteristics in a pipe downstream of a single straight tapered fin, a single fin with 180ʻ twist but otherwise identical geometry, and four twisted fins were therefore studied at a pipe-based Reynolds number of 80,000. Radial profiles of the mean and rms fluctuations of the streamwise and azimuthal velocity components are measured; results for the straight and twisted single fin are compared to determine the effects of fin geometry and swirl on the turbulent wake downstream of the fin. From a practical viewpoint, it is also desirable to have "adjustable" swirl, where swirl can either be turned "on" or "off" depending upon the type of paper product being produced. The next generation "swirler" concept consists of fins fabricated from two-way shape memory alloys. Using the two-way memory effect, the fins will be in their straight configuration when "cold" and twisted configuration (hence acting as a swirler) when "hot". This study is the initial phase in developing new active control mechanisms, known as the Vortigen concept, for increasing productivity, and hence reducing wasted raw material and energy, in the pulp and paper industry.

Download or read book Turbulent Pipe Flow with Swirl written by Diamantis Kounadis and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Character of Swirl in Turbulent Pipe Flow with Reference to Its Effect on Flowmeters written by D. M. Halsey and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mechanics of Swirling Turbulent Pipe Flow written by James Davis Cresswell and published by . This book was released on 1958 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Decay of Swirl in Turbulent Pipe Flows written by René R. Parchen and published by . This book was released on 1993 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effect of Swirl Angle and Geometry on Heat Transfer in Turbulent Pipe Flow written by Abdel-Motaleb Aly Mostafa and published by . This book was released on 1980 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Turbulent Pipe Flow Test Cases with and Without Obstructions and Swirl written by L W. Keeton and published by . This book was released on 1983 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fluid Mechanics of Flow Metering written by Wolfgang Merzkirch and published by Springer Science & Business Media. This book was released on 2005 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flow meters measure the volumetric flow rate in a pipeline. Most meters are based on deriving a signal from the fluid flow and calibrating the signal against the volumetric flow rate. The calibration is done in fully-developed flow, and the same state of flow must exist at the meter’s position when it is in practical use. Because the field of flow metering has been neglected by fluid mechanicists for a long time, this book addresses two major fluid mechanical problems in flow metering: the analysis of signal generation in turbulent pipe flow, which explains the function of the meter beyond a simple calibration, and the possible use of a meter in non-developed flows. These problems are investigated with reference to, and examples from, a variety of meters, e.g. ultrasound cross-correlation meters, vortex meters, and turbine meters. Studying these problems requires consideration of specific phenomena in turbulent non-developed pipe flow, as caused by installations, and finding special solutions with signal processing, both of which are included in the book.

Download or read book Analytical Investigation of Incompressible Turbulent Swirling Flow in Pipes written by Avelino Parcon Rochino and published by . This book was released on 1968 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Heat Transfer Pressure Drop and Flow Visualization for Axially Decaying Swirl in a Turbulent Pipe Flow written by Amir Chaboki and published by . This book was released on 1983 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modeling of Turbulent Swirling Flows written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-10-29 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aircraft engine combustors generally involve turbulent swirling flows in order to enhance fuel-air mixing and flame stabilization. It has long been recognized that eddy viscosity turbulence models are unable to appropriately model swirling flows. Therefore, it has been suggested that, for the modeling of these flows, a second order closure scheme should be considered because of its ability in the modeling of rotational and curvature effects. However, this scheme will require solution of many complicated second moment transport equations (six Reynolds stresses plus other scalar fluxes and variances), which is a difficult task for any CFD implementations. Also, this scheme will require a large amount of computer resources for a general combustor swirling flow. This report is devoted to the development of a cubic Reynolds stress-strain model for turbulent swirling flows, and was inspired by the work of Launder's group at UMIST. Using this type of model, one only needs to solve two turbulence equations, one for the turbulent kinetic energy k and the other for the dissipation rate epsilon. The cubic model developed in this report is based on a general Reynolds stress-strain relationship. Two flows have been chosen for model evaluation. One is a fully developed rotating pipe flow, and the other is a more complex flow with swirl and recirculation. Shih, Tsan-Hsing and Zhu, Jiang and Liou, William and Chen, Kuo-Huey and Liu, Nan-Suey and Lumley, John L. Glenn Research Center...

Download or read book Turbulence Manipulation in Pipe Flow by Means of Swirl Polymer Additives and Suspensions of Nanoparticles in Water written by Ananchai U-Kaew and published by . This book was released on 2007 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulence in a pipe flow was manipulated by the introduction of swirl, polymers and nanoparticles. Flow characteristics were measured by means of instantaneous differential pressure measurement, and Laser Doppler Velocimetry (LDV). Experimental data reveal domination of swirl over polymer effects as evidenced by the fact that drag reduction by polymers is not as effective in swirling pipe flow. On the other hand, with polymers, pressure fluctuations are reduced in a broad range of swirl regimes. In the current sets of experiments, two swirling flow regimes were confirmed: low (sw 2, jet-like profile) and high (sw 2, wake-like profile) swirl regimes. Rankine vortex-like profiles were also observed where the vortex in the core region becomes enhanced with polymer addition. Suppression of turbulence near pipe wall was observed with the introduction of spherical and elongated nanoparticles. Experimental results also show that nanofluids are not candidates for drag reduction, but have the potential for heat transfer enhancement in pipe flow, possibly due to the effective change in properties of the fluid.

Download or read book The Prediction of Turbulent Swirling Pipe Flow written by L. W. Roberts and published by . This book was released on 1971 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Boundary layer Velocity Distribution in Turbulent Swirling Pipe Flow written by R. G. Backshall and published by . This book was released on 1969 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Swirl Flows written by Ashwani K. Gupta and published by Routledge. This book was released on 1984 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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.