by National Aeronautics and Space Administration, Langley Research Center, National Technical Information Service, distributor in Hampton, Va, [Springfield, Va .
Written in English
|Statement||John F. Foss, Casey L. Klewicki, and Peter J. Disimile|
|Series||NASA contractor report -- a 178098, NASA contractor report -- NASA CR-178098|
|Contributions||Klewicki, Casey L, Disimile, Peter John, Langley Research Center|
|The Physical Object|
A comprehensive description of the technique used to obtain a time series of the quasi-instantaneous transverse vorticity from a four wire array of probes is presented. The algorithmic structure which supports the technique is described in detail and demonstration data, from a large plane shear layer, are presented to provide a specific utilization of the by: A technique, involving programmed digital calculations, is proposed for evaluating transverse vorticity in typical laboratory shear flows from an array of four hot-wire probes. The computing scheme successfully recovers the velocity vector information from a wide range Cited by: 8. A four-wire array of (hot-wire) probes, configured to measure the transverse vorticity (ω z) in a turbulent shear flow (ū = ū(x,y)) has been described in a series of publications: FOSS [1,2,3]; FOSS,  provides the most recent description of the probe, the computing algorithms, and representative results. Considering the conceptual and the computational importance of vorticity, the relative paucity Cited by: 5. The spatial resolution of hot-wire arrays for the measurement of small-scale turbulence L. W. B. & Chambers, A. J. On the spectrum of the transverse derivative of the streamwise velocity J. M. Influence of velocity gradients on measurements of velocity and streamwise vorticity with hot-wire X-array probes. Rev. Sci.
The results obtained in a two-dimensional mixing layer flow are compared with laser doppler measurements by Lang  and Lang & Dimotakis , with vorticity measurements from a four-sensor probe. The design and construction of a miniature hot-wire probe capable of simultaneously measuring all components of the velocity and vorticity vectors in turbulent flows are presented. A brief description of the probe resolution and calibration as well as the procedure to solve the cooling equations are given. Multiple Hot-Wire Probes: Measurements of Turbulent Velocity & Vorticity Vector Fields by Petar Vukoslavcevic (Author), Dragan Petrovic (Author) ISBN ISBN Why is ISBN important? ISBN. This bar-code number lets you verify that you're getting exactly the right version or edition of a book. A nine-sensor hot-wire probe is described which is capable of simultaneously measuring the velocity and vorticity vectors with a spatial resolution of about six Kolmogorov microscales just above the viscous sublayer in a thick turbulent boundary layer at a Reynolds number of R θ = Results from tests of the probe performance are presented to show that the three velocity components at.
Foss J F, Klewicki C L and Disimile P J Transverse vorticity measurements using an array of four hot-wire probes Michigan State University, College of Engineering Report FSL-R Foss J F and Wallace J M The measurement of vorticity in transitional and fully developed turbulent flows Advances in Fluid Mechanics Measurements (Lecture. An x-array (at z) is placed adjacent to a parallel array (at z + δz). R.E., Nagib, H.M. and Tan-atichat, J., () “On temperature and yaw dependence of hot-wire probes”, IIT Fluids and Heat Transfer Report R, August Google Scholar. Eckelmann, H., Nychas, S.G., Brodkey, R.S. and Wallace, J.M., “Vorticity and turbulence. The advantage of hot-wire anemometry is associated with its very high spatial resolution and excellent frequency response characteristics. In most cases, the probe-stem is perpendicularly aligned with the mainstream direction of flow. A particular type of hot-wire is given in Fig. For this configuration, the direction of mainstream flow. Spanwise vorticity measurements have been acquired using the compact four sensor hot-wire probe (Fig. 2) developed by Foss and coworkers, see, e.g., Haw et al. (). The two parallel wires record the magnitude of veloc-ity with a small (δy~mm) spatial separation. The sensors configured as an.