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Hydrodynamics and mechanism of hydrophobic foam column tray: Contact angle hysteresis effect
Author(s) -
Yan Peng,
Li Xingang,
Li Hong,
Shao Yuanyuan,
Zhang Hui,
Gao Xin
Publication year - 2020
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.16793
Subject(s) - contact angle , wetting , hysteresis , materials science , bubble , pressure drop , mass transfer , composite material , mechanics , thermodynamics , chemistry , chromatography , physics , quantum mechanics
Interfacial wettability adjustment is a new method for intensifying vapor–liquid mass transfer process. Contact angle effect has been well investigated but not complete due to interfacial wettability consisting of both static behavior (contact angle) and dynamic behavior (contact angle hysteresis). Here, methods of adjusting contact angle hysteresis (CAH) were proposed, and then, the CAH effect on the hydrodynamics was investigated. A multiscale analysis of CAH effect, from interfacial force and wettability to single‐bubble and gas–liquid two‐phase flow inside the foam to bubble swarm hydrodynamics, was conducted, and thus, the hydrodynamic performance criteria were derived. The interfaces had similar contact angles, whereas a significant difference in the CAH was prepared by using the developed sol dip‐coating and spray coating methods. Subsequent experiments revealed that lower CAH can decrease the pressure drop, homogenize the gas distribution, and increase the weeping rate, which are consistent with the derived criteria.