TY - GEN
T1 - Droplet breakup in shear and elongation dominated flows in microfluidic devices
AU - Anna, Shelley L.
AU - Christopher, Gordon F.
AU - Noharuddin, Nadia
PY - 2005
Y1 - 2005
N2 - Microfluidic devices have recently been demonstrated as an effective platform for generating monodisperse drops and bubbles, which is important for applications from emulsification to drug delivery and lab on a chip. Here we compare drop formation mechanisms in microfluidic devices in which flows can be either predominantly shear flows, or predominantly elongational flows. In either case, drops of an aqueous liquid form due to viscous stresses imposed by a second oil phase. We show that the two flow types lead to dramatically different ability to control droplet sizes. We characterize the drop size over a large number of experiments by varying capillary number, volume fraction, and viscosity ratio. We observe distinct breakup modes depending on these three dimensionless parameters, and the flow type.
AB - Microfluidic devices have recently been demonstrated as an effective platform for generating monodisperse drops and bubbles, which is important for applications from emulsification to drug delivery and lab on a chip. Here we compare drop formation mechanisms in microfluidic devices in which flows can be either predominantly shear flows, or predominantly elongational flows. In either case, drops of an aqueous liquid form due to viscous stresses imposed by a second oil phase. We show that the two flow types lead to dramatically different ability to control droplet sizes. We characterize the drop size over a large number of experiments by varying capillary number, volume fraction, and viscosity ratio. We observe distinct breakup modes depending on these three dimensionless parameters, and the flow type.
UR - http://www.scopus.com/inward/record.url?scp=33645963461&partnerID=8YFLogxK
U2 - 10.1115/IMECE2005-80625
DO - 10.1115/IMECE2005-80625
M3 - Conference contribution
AN - SCOPUS:33645963461
SN - 079184224X
SN - 9780791842249
T3 - American Society of Mechanical Engineers, Micro-Electro Mechanical Systems Division, (Publications) MEMS
SP - 669
EP - 671
BT - American Society of Mechanical Engineers, Micro-Electro Mechanical Systems Division, (Publications) MEMS
T2 - 2005 ASME International Mecahnical Engineering Congress and Exposition, IMECE 2005
Y2 - 5 November 2005 through 11 November 2005
ER -