Abbreviated Journal Title
Sci Rep
Keywords
LIQUID DROPLETS; COALESCENCE; DROPS; MICROFLUIDICS; DISRUPTION; SEPARATION; BUBBLES; PHYSICS; Multidisciplinary Sciences
Abstract
Micro-total analysis systems (mu TAS) have attracted wide attention and are identified as a promising solution for sample transport, filtration, chemical reactions, separation and detection. Despite their popularity, the selection of an appropriate mechanism for droplet transport and coalescence has always been a challenge. This paper investigates the use of Marangoni flow as a mechanism for levitating and transporting droplets on immiscible liquid films at higher speeds than is possible currently. For the first time, we show that it is possible to realize the natural coalescence of droplets through Marangoni effect without any external stimulation, and deliver the coalesced droplet to a certain destination through the use of surface tension gradients. The effects of shape and size on collision outcome are studied. Regions of coalescence and stretching separation of colliding droplets are delineated based on Weber number and impact number. In addition, the effect of viscosity on post collision regimes is studied. The findings in this fundamental study can be beneficial to many applications such as welding, drug delivery and microfluidics devices in controlling small droplets and targeting them to various locations.
Journal Title
Scientific Reports
Volume
5
Publication Date
1-1-2015
Document Type
Article
DOI Link
Language
English
First Page
8
WOS Identifier
ISSN
2045-2322
Recommended Citation
Davanlou, Ashkan and Kumar, Ranganathan, "Thermally induced collision of droplets in an immiscible outer fluid" (2015). Faculty Bibliography 2010s. 6489.
https://stars.library.ucf.edu/facultybib2010/6489
Comments
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