TY - JOUR
T1 - An experimental study on the coalescence process of binary droplets in oil under ultrasonic standing waves
AU - Luo, Xiaoming
AU - Cao, Juhang
AU - He, Limin
AU - Wang, Hongping
AU - Yan, Haipeng
AU - Qin, Yahua
PY - 2017/1/1
Y1 - 2017/1/1
N2 - The coalescence process of binary droplets in oil under ultrasonic standing waves was investigated with high-speed photography. Three motion models of binary droplets in coalescence process were illustrated: (1) slight translational oscillation; (2) sinusoidal translational oscillation; (3) migration along with acoustic streaming. To reveal the droplets coalescence mechanisms, the influence of main factors (such as acoustic intensity, droplet size, viscosity and interfacial tension, etc) on the motion and coalescence of binary droplets was studied under ultrasonic standing waves. Results indicate that the shortest coalescence time is achieved when binary droplets show sinusoidal translational oscillation. The corresponding acoustic intensity in this case is the optimum acoustic intensity. Under the optimum acoustic intensity, drop size decrease will bring about coalescence time decrease by enhancing the binary droplets oscillation. Moreover, there is an optimum interfacial tension to achieve the shortest coalescence time.
AB - The coalescence process of binary droplets in oil under ultrasonic standing waves was investigated with high-speed photography. Three motion models of binary droplets in coalescence process were illustrated: (1) slight translational oscillation; (2) sinusoidal translational oscillation; (3) migration along with acoustic streaming. To reveal the droplets coalescence mechanisms, the influence of main factors (such as acoustic intensity, droplet size, viscosity and interfacial tension, etc) on the motion and coalescence of binary droplets was studied under ultrasonic standing waves. Results indicate that the shortest coalescence time is achieved when binary droplets show sinusoidal translational oscillation. The corresponding acoustic intensity in this case is the optimum acoustic intensity. Under the optimum acoustic intensity, drop size decrease will bring about coalescence time decrease by enhancing the binary droplets oscillation. Moreover, there is an optimum interfacial tension to achieve the shortest coalescence time.
KW - Acoustic intensity
KW - Binary droplets
KW - Coalescence time
KW - Interfacial tension
KW - Ultrasonic standing waves
UR - http://www.scopus.com/inward/record.url?scp=84982710237&partnerID=8YFLogxK
U2 - 10.1016/j.ultsonch.2016.07.024
DO - 10.1016/j.ultsonch.2016.07.024
M3 - Article
C2 - 27773311
AN - SCOPUS:84982710237
VL - 34
SP - 839
EP - 846
JO - Ultrasonics Sonochemistry
JF - Ultrasonics Sonochemistry
SN - 1350-4177
ER -