Micro-machined super-miniature hot-film multi-array probe for field experiments with sub-Kolmogorov resolution

Y. Borisenkov, G. Gulitski, M. Kholmyansky, S. Krylov, A. Liberzon, A. Tsinober

Research output: Contribution to journalArticlepeer-review

Abstract

This is a report on the first successful experiments with a unique micro-hot-film multi-array probe. The main aim of this part of the project was to design, fabricate, implement and test in laboratory conditions a micro-hot-film multi-array probe for measurements in turbulent flows in field experiments with sub-Kolmogorov resolution. The key feature is that the probe is enabling to access, along with all three components of turbulent velocity fluctuations, also all nine components of the spatial velocity gradients tensor, including the option of obtaining the stream-wise velocity derivatives without employing the Taylor hypothesis, as well as velocity temporal derivatives. Hence the multi-array probe (typically five arrays) is built with each array consisting of four hot-film sensors, similarly to that of larger multi-array probe, based on arrays with four hot wires used in the atmospheric surface layer at Taylor micro-scale Reynolds number up to Reλ ≈ 104. This part of work relates to Reynolds numbers Reλ < 500 and employs several laboratory flows including flow in a channel of rectangular cross section, in its bulk and in the boundary layers in the proximity of its smooth and rough walls, and in the confined jet of circular cross section.

Original languageEnglish
Pages (from-to)525-539
Number of pages15
JournalJournal of Turbulence
Volume16
Issue number6
DOIs
StatePublished - 3 Jun 2015

Keywords

  • sub-Kolmogorov resolution
  • turbulent flows
  • velocity gradients tensor

Fingerprint

Dive into the research topics of 'Micro-machined super-miniature hot-film multi-array probe for field experiments with sub-Kolmogorov resolution'. Together they form a unique fingerprint.

Cite this