2 edition of A laser velocimeter to study turbulent flow found in the catalog.
A particle image velocimetry was used to study shallow open channel turbulent flow over d-type and k-type transverse ribs of square, circular, and semi-circular cross ratio of boundary layer thickness to depth of flow varied from 50% to 90%. Surface mean pressures, oil flow visualization, and 3-velocity-component laser-Doppler velocimeter measurements are presented for a turbulent boundary layer (TBL) of momentum thickness Reynolds number, Re(theta) and TBL thickness delta over two axisymmetric and one symmetric bump. LDV data were obtained at one plane x/H = for each case. than fully developed turbulent flow. Hence transition is of both academic and practical significance. Banfi et al (1) used a laser-Doppler velocimeter to investigate transitional pipe flow, in particular the behaviour of the velocity fluctuations as the Reynolds number was increased from to Master of Science. Show simple item record. An Experimental Study of Turbulent Boundary Layers Subjected to High Free-stream Turbulence Effects.
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Open A laser velocimeter to study turbulent flow book A laser-Doppler velocimetry study of ensemble-averaged characteristics of the turbulent near wake of a square cylinder By D. gave the relevant flow equations for both coherent and turbulent flow quantities.
Critical-point theory has been exploited in discussions of separated flow patterns. Velocity bias effects on data obtained with a coincident two channel laser Doppler velocimeter in a highly turbulent separated supersonic flow are presented.
Probability distributions of the fluctuating velocities were distorted by velocity bias in a manner consistent with theory and a two-dimensional velocity inverse weighting function bias correction produced reasonable appearing Cited by: The present work is an experimental study of A laser velocimeter to study turbulent flow book evolutioncharacteristics of swirl in the flow in a pipe at a moderately highReynolds number and over a wide range of swirl numbers characterisingthe swirl strength.
The measurements are done by 3D LDV in a speciallydesigned facility that works on the principle of refractive-indexmatching. Swirl with the well-defined distribution of a Cited by: Both a two-dimensional, rearward facing step and a cylindrical, sudden expansion geometry are considered in the present study of subsonic separated flows using a laser Doppler velocimeter (LDV).Cited by: 2.
A critical evaluation is made of the spectral bias which occurs in the use of a laser Doppler velocimeter (LDV). In order to accommodate the randomly sampled LDV data, statistical treatments of particle arrival times are needed. This is modeled as a doubly stochastic Poisson process which includes the intensity function of the velocity field.
The laser Doppler velocimeter (LDV) and hydrogen bubble flow visualization techniques have been used to measure the characteristics of turbulent boundary layer flow over riblets surface and to observe its coherent structure in the near wall region.
Laser velocimeter measurements in the highly turbulent flow field following an axisymmetric sudden expansion have been carried out for both isothermal and reacting flows. Mean streamwise velocity and turbulence intensity profiles covering the region from the sudden expansion to well beyond shear layer reattachment are presented.
Books; Join AIChE; ; AIChE Journal. Vol Issue 2. Article. Two‐component laser doppler velocimeter studies of submerged jets of dilute polymer solutions.
Berman. Department of Chemical and Bio Engineering, Arizona State University, Tempe, AZ Lagrangian dispersion in turbulent flow from laser transit anemometry.
We have also included a number of new results on areas such as photon counting in turbulent and periodic flows, frequency domain and time domain analysis of laser Doppler velocimeter signals, effect of background noise on system performance, and on cross-correlation techniques for diffusing flows.
Laser velocimeter measurements in the highly turbulent flow field following a sudden axisymmetric expansion have been carried out for both isothermal and reacting flows. Mean velocity and turbulence intensity profiles covering the region from the sudden expansion to well beyond shear layer reattachment are presented.
Laser velocimeter measurements of mean velocities and turbulence parameters were made in a cylindrical simulated dump combustor. Velocity bias errors were eliminated by use of an experimental technique developed in an earlier study.
Laser-Doppler measurements of laminar and turbulent flow in a pipe bend. International Journal of Heat and Fluid Flow, Vol. 3, Issue. 4, p. International Journal of Heat and Fluid Flow, Vol.
3. lnt. Multiphase FIow Vol. 9, No. 6, pp./83 $+ Printed in Great Britain. Pergarnon/Elsevier BRIEF COMMUNICATION LASER DOPPLER VELOCIMETER MEASUREMENTS OF AEROSOLS IN TURBULENT PIPE FLOW J. STEIMKEt and A. DUKLER Department of Chemical Engineering, University of Houston, Houston, TXU.S.A.
(Received. The power spectrum of phototube current from a laser Doppler velocimeter operating in the heterodyne mode has been computed. The spectrum is obtained in terms of the space time correlation.
In order to demonstrate that the components of the R.A.T.5 mouse may be used as an inexpensive laser Doppler velocimeter, the system was used to measure the mean and turbulent velocity of a flowing soap film, a laboratory-scale analogue of some large-scale turbulent flows in the environment.
George, W. & Lumley, J. The laser-Doppler velocimeter and its application to the measurement of turbulence J. Fluid Mech. 60, Google Scholar Giel, T. & Barnett, C. Analytical and experimental study of statistical bias in laser velocimetry. Chris C. Lu, Measurements of turbulent flow velocity for sudden expansion cylindrical tube using laser Doppler velocimeter (LDV), AIChE Journal, /aic.
Biasing correction for individual realization of laser anemometer measurements in turbulent flow D.K. McLaughlin, W.G. Tiederman (Physics of Fluids ) New biasing elimination method for laser-Doppler velocimeter counter processing W.
Hoesel, W. Rodi (Review of. A comparative study was conducted between a two component laser Doppler velocimeter and a hot film x-probe to develop a base level of confidence in the laser velocimeter as a toll to measure turbulence parameters, and to evaluate some of the velocity-bias correction techniques.
The overall objective of this investigation was to develop a reliable technique for obtaining nonintrusive. A note on turbulence measurements with a laser velocimeter - Volume - J.
Lau, M. Whiffen, M. Fisher, D. Smith. Books. AIAA Education Series; Library of Flight; A study of compressible turbulent free shear layers using laser Doppler velocimetry. Measurement of turbulence transport properties in a supersonic boundary-layer flow using laser velocimeter and hot-wire anemometer techniques.
A computer‐controlled data acquisition system has been designed and constructed to automate measurement of turbulent velocity correlations in a two‐dimensional turbulent wall jet. Measurements are made with a single component laser Doppler velocimeter system in a flow of air on a flat plate with stagnant surroundings.
Measurements of a number of turbulence parameters have been completed. Laser velocimetry (LV) was used to study the nature of laminar separation bubbles in the concave region of a meter airfoil model which was tested in the NASA Langley Low Turbulence Pressure Tunnel.
A spectral method of detection of laser Doppler velocimeter signals in turbulent flows is proposed. Laser anemometer study of flow development in curved circular pipes. Journal of Fluid Mechanics, Vol. 85, Issue.
03, p. Analytical evaluation of techniques for use of a laser Doppler velocimeter to measure flow and turbulence*. Journal of the Optical Society of America, Vol. 65, Issue. 1, p. & Hagen, W. Turbulent flow. In addition, the introduction of the laser Doppler velocimetry (LDV) provided another tool for nonintrusive measurements of turbulent flow in the laboratory (e.g., Nezu and Rodi ).
Similarly, field turbulence and sediment transport process studies require the use of rapidly responding flow-measuring devices. The determination of airflow parameters is essential to the research of critical information on environment monitoring, chemical kinetics, and aerodynamic and propulsion applications.
During the past few decades, tunable diode laser absorption spectroscopy has become a common and efficient tool for the flow velocity measurement based on the Doppler shift of the absorption line.
Books. AIAA Education Series; Library of Flight; Progress in Astronautics and Aeronautics; The Aerospace Press; Browse All Books; Meeting Papers; Standards; Other Publications. For Authors ; Vol Issue No Access. Direct measurement of laser velocimeter bias errors in a turbulent flow.
Laser Velocimeter Measurements in Highly Turbulent Recirculating Flows W. H., Thompson, H. D., and Craig, R. (June 1, ). "Laser Velocimeter Measurements in Highly Turbulent Recirculating Flows." ASME. Fluids Eng. June ; (2): – Although the k-ε turbulence model provides a good qualitative picture of the flow.
Petrie used the laser Doppler velocimeter (LDV) to study only the constant-pressure region of the shear layer in a Mach incoming flow with a turbulent boundary layer. Ikawa and Kubota12and Petrie et al. also generated constant-pressure shear layers over a backward-facing step by using mass bleed from the floor of the wind tunnel.
A particular turbulent vortex ring with a relatively thin core was chosen for detailed study. The velocity field of this ring measured at numerous locations in the tank, using a two-channel laser-Doppler velocimeter with digital tracking electronics.
Beam. A finite difference technique which can easily be applied to turbulent flows having complex geometries was used.
The calculated results of air and particle turbulence characteristics (mean velocity distributions, turbulence intensity distributions and Reynolds stress distributions) are in good agreement with experimental data obtained using a.
flow, which in turn can generate and enhance 3-D turbulent flow even at low Re because of incompressibility. (3) There Fig. 1 (a) Schematic of the microfluidic chip setup. The dashed arrow lines represent the instantaneous electric field. (b–f) Visualization of the diffusion process using Laser-Induced Fluorescence.
(b) Flow without forcing. Turbulent flow in a square-to-round transition. Washington, D.C.: U.S. National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va.: For sale by the National Technical Information Service], (OCoLC) Material Type: Government publication, National government publication: Document.
Books. AIAA Education Series; Library of Flight; Progress in Astronautics and Aeronautics; The Aerospace Press; Browse All Books; Meeting Papers; Standards; Other Publications.
Software/Electronic Products; Aerospace America ; Public Policy Papers ; APPLICATION OF A DUAL BEAM LASER VELOCIMETER TO TURBULENT FLOW MEASUREMENTS V. Cline and H. Bentley III ARO, Inc. ARNOLD ENGINEERING DEVELOPMENT CENTER AIR FORCE SYSTEMS COMMAND ARNOLD AIR FORCE STATION, TENNESSEE September Final Report for Period July 1, - J Approved for public release; distribution unlimited.
Chen's research works with 3, citations and 2, reads, including: Effects of free stream velocity on turbulent natural convection flow over a vertical forward-facing step.
As the name ‘free’ implies, these flows are remote from walls, and the turbulent flow arises because of mean-velocity differences. We begin by examining the round jet. By combining experimental observations (Section ) with the Reynolds equations (Section ), a good deal can be learned, not only about the round jet, but also about the.
Applications of laser velocimetry to the measurement of turbulent flow properties of strong transonic viscous-inviscid interactions are reviewed. The data resulting from these studies are then discussed in relation to their importance in the development of improved viscous-flow calculation methods.
For three-component laser velocimeter systems, the change in projected area of the coincident measurement volume for different flow directions will introduce an “angular” bias in naturally sampled data.
In this study, the effect of turbulence level and orientation of the measurement volumes on angular bias errors was examined.Design and application of a novel Laser-Doppler Velocimeter for turbulence structural measurements in turbulent boundary layers Lowe, Kevin Todd (Virginia Tech, ) An advanced laser-Doppler velocimeter is designed to acquire fully-resolved turbulence structural measurements in high Reynolds number two- and three-dimensional.mixed with dye solution for the purpose of flow visualization.
Typical photographs of a laminar and a turbulent ring are shown in figure 2. 3. The experiment Some optical features of the laser-Doppler velocimeter (LDV) designed and constructed as part of this research have been described elsewhere (Glezer &, Coles ).