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Published on: August 21, 2019
Observation of viscous liquid flow in tobacco substrate during heating using optical coherence tomography
Tiara N Pratiwi1, Toshiaki Iwai2, Iori Nakaya3
1Department of Food and Energy Systems Science, Tokyo University of Agriculture and Technology (TUAT), Koganei, Tokyo, Japan, Graduate School of BASE, TUAT, Koganei, Tokyo, Japan.
Abstract:
The present study used optical coherence tomography (OCT) to monitor the dynamics of a highly viscous liquid in a porous tobacco substrate during heating. The OCT technique was integrated with a specially designed heating chamber and an air pump for measuring. Two transitional points in the liquid behaviours at different temperatures were estimated using OCT and statistical analysis of the attenuation coefficient. The first point, 'A', shows the time approximation at which the penetration-dominant zone transitions into the evaporation-dominant zone. The second point, 'B', indicates the time approximation at which rapid evaporation of free liquid transitions into slow evaporation of trapped and bound liquid. This analytical system is an alternative for tracking liquid transport in porous biomass during heating.
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