Measurements of thermally stratified pipe flow using image-processing techniques

J. Sakakibara, K. Hishida, M. Maeda

Research output: Contribution to journalArticlepeer-review

152 Citations (Scopus)


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
Issue number2
Publication statusPublished - 1993 Dec 1

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Fluid Flow and Transfer Processes


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