Turbulence measurements using a nanoscale thermal anemometry probe

Sean C.C. Bailey, Gary J. Kunkel, Marcus Nils Hultmark, Margit Vallikivi, Jeffrey P. Hill, Karl A. Meyer, Candice Tsay, Craig B. Arnold, Alexander Smits

Research output: Contribution to journalArticlepeer-review

103 Scopus citations

Abstract

A nanoscale thermal anemometry probe (NSTAP) has been developed to measure velocity fluctuations at ultra-small scales. The sensing element is a free-standing platinum nanoscale wire, 100 nm×2 μm × 60 μm, suspended between two current-carrying contacts and the sensor is an order of magnitude smaller than presently available commercial hot wires. The probe is constructed using standard semiconductor and MEMS manufacturing methods, which enables many probes to be manufactured simultaneously. Measurements were performed in grid-generated turbulence and compared to conventional hot-wire probes with a range of sensor lengths. The results demonstrate that the NSTAP behaves similarly to conventional hot-wire probes but with better spatial resolution and faster temporal response. The results are used to investigate spatial filtering effects, including the impact of spatial filtering on the probability density of velocity and velocity increment statistics.

Original languageEnglish (US)
Pages (from-to)160-179
Number of pages20
JournalJournal of Fluid Mechanics
Volume663
DOIs
StatePublished - Nov 25 2010

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Keywords

  • MEMS/NEMS
  • turbulent flows

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