Paper Search Console

Home Search Page About Contact

Journal Title

Title of Journal: Exp Fluids

Search In Journal Title:

Abbravation: Experiments in Fluids

Search In Journal Abbravation:

Publisher

Springer-Verlag

Search In Publisher:

DOI

10.1002/pbc.21142

Search In DOI:

ISSN

1432-1114

Search In ISSN:
Search In Title Of Papers:

Hotwire spatial resolution effects in measurement

Authors: A Ashok S C C Bailey M Hultmark A J Smits
Publish Date: 2012/09/27
Volume: 53, Issue: 6, Pages: 1713-1722
PDF Link

Abstract

We use gridgenerated turbulence as a benchmark flow to test the effects of spatial resolution on turbulence measurements with hot wires To quantify the spatial filtering measurements of the turbulence statistics and spectra downstream of the grid were made using hot wires of varying length and compared to the results from a new nanoscale thermal anemometry probe which has a sensing length of the order of or smaller than the Kolmogorov scale In order to separate the effects of temporal and spatial filtering a study was performed to ensure that the data were free of the artifacts of temporal filtering so that differences in the measurements could be wholly attributed to spatial filtering An empirical correlation for the attenuation of the streamwise Reynolds stress due to spatial filtering is constructed and it is shown that these grid turbulence results relate directly to the nearwall region of wallbounded flows where the effects of spatial filtering are most acutely felt The effect of spatial filtering on the streamwise spectrum function is observed to extend to almost all wavenumbers even those significantly lower than the length of the hot wire itself It is also shown that estimates of the Kolmogorov scale are affected by spatial filtering when wires longer than the Kolmogorov length are usedThis work was supported by ONR Grant N000140910263 Program Manager Ron Joslin and NSF Grant CBET1064257 Program Manager Henning Winter Margit Vallikivi provided the NSTAP probes and Mike Vocaturo and Glenn Northey generously gave their technical assistance

Keywords:

References

.
Search In Abstract Of Papers:
Other Papers In This Journal:
  1. Passive mixing control of plane parallel jets
  2. Planar fluorescence for round bubble imaging and its application for the study of an axisymmetric two-phase jet
  3. Imaging diffusion in a microfluidic device by third harmonic microscopy
  4. Two- and three-dimensional flows in nearly rectangular cavities driven by collinear motion of two facing walls
  5. Vortex dynamics and mass entrainment in turbulent lobed jets with and without lobe deflection angles
  6. Using stereo multigrid DPIV (SMDPIV) measurements to investigate the vortical skeleton behind a finite-span flapping wing
  7. Influence of a wavy boundary on turbulence.
  8. A novel data reduction technique for single slanted hot-wire measurements used to study incompressible compressor tip leakage flows
  9. Digital holography for micro-droplet diagnostics
  10. Kriging regression of PIV data using a local error estimate
  11. Active control of an axisymmetric jet with distributed electromagnetic flap actuators
  12. Experimental investigations on steady wake effects in a high-lift turbine cascade
  13. Simultaneous droplet and vapour-phase measurements in an evaporative spray by combined ILIDS and PLIF techniques
  14. Simultaneous droplet and vapour-phase measurements in an evaporative spray by combined ILIDS and PLIF techniques
  15. Experimental study of liquid–vapor phase distribution in a single tube capillary evaporator
  16. Analysis of the impact of impeller geometry on the turbulent statistics inside a fan-stirred, cylindrical flame speed vessel using PIV
  17. Detection of microorganismic flows by linear and nonlinear optical methods and automatic correction of erroneous images artefacts and moving boundaries in image generating methods by a neuronumerical hybrid implementing the Taylor’s hypothesis as a priori knowledge
  18. Effect of experimental parameters and image noise on the error levels in simultaneous velocity and temperature measurements using molecular tagging velocimetry/thermometry (MTV/T)
  19. Turbulence measurements in pipe flow using a nano-scale thermal anemometry probe
  20. The pinch-off process in a starting buoyant plume
  21. Defining the roughness sublayer and its turbulence statistics
  22. Evolution of a forced counter rotating vortex pair for two selected forcing frequencies
  23. Optically efficient fluorescent tracers for multi-constituent PIV
  24. Intermittent corner separation in a linear compressor cascade
  25. A novel architecture for a super-resolution PIV algorithm developed for the improvement of the resolution of large velocity gradient measurements
  26. Measurement of the turbulent kinetic energy budget of a planar wake flow in pressure gradients
  27. Correcting hot-wire spatial resolution effects in third- and fourth-order velocity moments in wall-bounded turbulence
  28. High-speed roll coating with complex rheology fluids
  29. Wing–vortex interaction: unraveling the flowfield of a hovering rotor
  30. Near-surface velocimetry using evanescent wave illumination
  31. Designing a maximum precision interferometric particle imaging set-up
  32. Characterizing the lower log region of the atmospheric surface layer via large-scale particle tracking velocimetry
  33. Development and characterization of high-frequency resonance-enhanced microjet actuators for control of high-speed jets
  34. PIV measurement of internal flow characteristics of very low specific speed semi-open impeller
  35. A new method for measuring turbulent heat fluxes using PIV and fast-response cold-wires
  36. Reynolds number dependence of the inertial range scaling of energy dissipation rate and enstrophy in a cylinder wake
  37. Velocity measurements in the oscillatory boundary layer produced by acoustic waves
  38. Measurement of velocity profiles in a rectangular microchannel with aspect ratio α = 0.35
  39. Velocity measurements in the oscillatory boundary layer produced by acoustic waves
  40. Global Doppler frequency shift detection with near-resonant interferometry
  41. Polymer-induced turbulence modifications in an impinging jet
  42. Quantitative detection of turbulent reattachment using a surface mounted hot-film array
Search Result: