Measurements of thermally stratified pipe flow using image-processing techniques

J. Sakakibara, Koichi Hishida, M. Maeda

Research output: Contribution to journalArticle

133 Citations (Scopus)

Abstract

The cross-correlation technique and Laser Induced Fluorescence (LIF) have been adopted to measure the time-dependent and two-dimensional velocity and temperature fields of a stably thermal-stratified pipe flow. One thousand instantaneous and simultaneous velocity and temperature maps were obtained at overall Richardson number Ri = 0 and 2.5, from which two-dimensional vorticity, Reynolds stress and turbulent heat flux vector were evaluated. The quasi-periodic inclined vortices (which connected to the 'crest') were revealed from successive instantaneous maps and temporal variation of vorticity and temperature. It has been recognized that these vortices are associated with the 'crest' and 'valley' in the roll-up motion.

Original languageEnglish
Pages (from-to)82-96
Number of pages15
JournalExperiments in Fluids
Volume16
Issue number2
DOIs
Publication statusPublished - 1993 Dec

Fingerprint

pipe flow
Pipe flow
Vorticity
vorticity
image processing
Image processing
Vortex flow
vortices
Richardson number
Reynolds stress
laser induced fluorescence
cross correlation
valleys
Heat flux
heat flux
Temperature distribution
temperature distribution
velocity distribution
Fluorescence
Temperature

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Computational Mechanics
  • Fluid Flow and Transfer Processes

Cite this

Measurements of thermally stratified pipe flow using image-processing techniques. / Sakakibara, J.; Hishida, Koichi; Maeda, M.

In: Experiments in Fluids, Vol. 16, No. 2, 12.1993, p. 82-96.

Research output: Contribution to journalArticle

Sakakibara, J. ; Hishida, Koichi ; Maeda, M. / Measurements of thermally stratified pipe flow using image-processing techniques. In: Experiments in Fluids. 1993 ; Vol. 16, No. 2. pp. 82-96.
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