Binormal cooling errors in crossed hot-wire measurements

Rongrong Zhao, Alexander J. Smits

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


In crossed hot-wire measurements, cooling of the filament in the direction normal to the hot-wire measurement plane will cause additional heat transfer, called binormal cooling. It is shown that binormal cooling can lead to significant errors in measuring the mean velocity and the turbulence levels in regions where the turbulence level is high, such as the near-wall region of pipes and boundary layers. In a near-wall measurement of a pipe flow, binormal cooling effects lead to errors up to 1.5% in mean velocity and 4% in turbulent shear stress.

Original languageEnglish (US)
Pages (from-to)212-217
Number of pages6
JournalExperiments in Fluids
Issue number2
StatePublished - Feb 2006

All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Mechanics of Materials
  • General Physics and Astronomy
  • Fluid Flow and Transfer Processes


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