Capillary Dynamics of Water/Ethanol Mixtures

Hui Cao, Carlos Amador, Xiaodong Jia, Yulong Ding

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


Surface tension and contact angle play important roles in capillary dynamics during washing commission of spray-dried detergent powder where interaction between surface chemistry and liquid is concerned. An experimental study for the dynamics of water/ethanol mixtures in both hydrophilic and hydrophobic capillary tubes has been investigated. The combination of water/ethanol mixtures and trimethylchlorosilane coating on capillaries provides a variety of liquid surface tension and contact angle for the penetrating system. Significant differences of penetrating speed on hydrophilic and hydrophobic tubes indicate that dynamic contact angle dominates the hydrophobic surface while liquid surface tension plays a more important role on the hydrophilic surface. The speed gradient of different liquids on hydrophilic surface is greater than the hydrophobic surface, mainly due to the domination between hydrogen bonding structures and water polarity while liquid moves on surfaces covered with different chemistry, physically absorbed water on silica capillaries or silanol group covered capillaries.
Original languageEnglish
Pages (from-to)12196-12203
Number of pages8
JournalIndustrial and Engineering Chemistry Process Design and Development
Issue number48
Early online date24 Nov 2015
Publication statusPublished - 9 Dec 2015
Externally publishedYes


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