Customer Login Shopping Cart
Library Subscription: Guest
Home Archives Officers Future meetings American Society of Thermal and Fluids Engineering

ISBN : 978-1-56700-470-0 (Flash Drive)

ISBN : 978-1-56700-469-4

Second Thermal and Fluids Engineering Conference
2017, 2-5 April, Las Vegas, NV, USA

DROPLETS MOVEMENT AND COALESCENCE IN HYDROPHOBIC MICROCHANNEL

DOI: 10.1615/TFEC2017.bev.018409
pages 1387-1390

Abstract

Based on volume of fluid (VOF) method, a three-dimensional model of droplet behaviors is developed to numerically investigate the movement and coalescence of droplets in a rectangular microchannel with hydrophobic inner surface. The detailed movement and coalescence of droplets under different stream flow velocity and droplets diameter are numerically simulated to elucidate the effects of these influence factors on the coalescence time, coalescence position and the droplet interface oscillation after the coalescence. The results indicate that the coalescence occurs under the conditions of two equal-sized droplets and the binary droplets with a smaller front one. Under the propelling of the main stream, the droplet skews to the flow direction with the contact angle hysteresis appearing. During the coalescence process, the oscillation of contact area between the coalescent droplet and channel wall occurs, which is damped to be a stable value at last. With the increase of stream flow velocity, the coalescence time decreases and the coalescence distance increases at first and then decreases.