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Measuring local droplet parameters using single optical fiber probe
Author(s) -
Kim Taeho,
Ahn Taehwan,
Bae Byeonggeon,
Jeong Jae Jun,
Yun Byongjo,
Kim Kyungdoo
Publication year - 2019
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.16591
Subject(s) - ranging , optical fiber , fiber , conical surface , mean absolute percentage error , fiber optic sensor , optics , materials science , chemistry , mechanics , physics , mathematics , composite material , engineering , statistics , telecommunications , mean squared error
This article proposes a new single optical fiber probe (OFP) sensor method for measuring local droplet parameters such as droplet fraction, droplet velocity, and droplet diameter. To this end, we developed a stretched conical optical fiber probe (SC‐OFP) sensor that minimizes the wetting of the sensing tip at a high droplet velocity, a discrimination algorithm based on the first and second derivatives of the output of the raw signal of the OFP sensor, and a method that uses neural network training to determine local droplet velocity independently of droplet size. In the experiments conducted, the developed SC‐OFP sensor measured local droplet velocity with a mean absolute percentage error (MAPE) smaller than 4.1% for velocities ranging from 2 to 32 m/s, and droplet diameter with a MAPE smaller than 4.9% for diameters ranging from 0.29 to 1.78 mm.