Laser grating technique for measurement of local velocity of large drops and jets in liquid-liquid systems

Raphael Semiat, Enna Leshinski, Aluf Orell*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Measurement of the local rise velocity of large liquid drops of 3-7 mm in diameter and the local axial wave propagation velocity on a liquid jet surface in liquid-liquid systems were successfully performed using a Laser Grating Velocimeter (LGV). The primary frequency of the photodetector signal that is required for evaluation of the local velocity, was determined unambiguously by a frequency-domain Fast Fourier Transform analysis of the velocity signal. The validity of this technique, which eliminates potential measurement errors, was confirmed by a controlled experiment. The LGV was applied to the determination of the drop terminal rise, velocity distribution of a population of 300 drops, and axial distribution of the jet surface wave velocity in order to demonstrate the capability and effectiveness of the technique.

Original languageEnglish
Pages (from-to)5111-5123
Number of pages13
JournalChemical Engineering Science
Volume51
Issue number23
DOIs
StatePublished - Dec 1996
Externally publishedYes

Keywords

  • Drop motion
  • jets
  • laser-Doppler anemometry
  • liquid-liquid
  • terminal velocity

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