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Effect of wetting difference across junction on dynamics of drops impacting on the junction of dual‐textured surfaces
Author(s) -
Vaikuntanathan Visakh,
Sivakumar D.
Publication year - 2016
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.15297
Subject(s) - wetting , materials science , drop (telecommunication) , groove (engineering) , composite material , spiral (railway) , drop impact , sessile drop technique , texture (cosmology) , metallurgy , mechanical engineering , engineering , image (mathematics) , artificial intelligence , computer science
The effect of wetting difference across the junction of smooth and groove‐textured portions of a dual‐textured surface on the various stages in the dynamics of liquid drops impacting on the junction is reported. Two dual‐textured surfaces with substantially different wetting difference across their junction, Δθ e = 65° and 25°, made of intrinsically hydrophilic stainless steel and intrinsically hydrophobic poly‐di‐methyl‐siloxane (PDMS) are considered. The effect of wetting difference across the junction is dominantly seen on the net drop drift velocity and subsequent bulk drop movement, ξ. ξ on the PDMS dual‐textured surface is less than that on the stainless dual‐textured surface due to the lower wetting difference across the junction of the former. The variation of ξ with impact velocity shows a contrasting trend between the stainless steel and PDMS dual‐textured surfaces due to the difference in critical impact velocity corresponding to drop impregnation on their groove‐textured portions. © 2016 American Institute of Chemical Engineers AIChE J , 62: 4109–4118, 2016