Abstract
Droplet impact is a common but significant phenomenon in industry. The CLSVOF (coupled level set and volume-of-fluid) method is used to numerically study the successive dual-droplet impacting a super-hydrophobic tube. For the impact velocity of 1.0 m/s, the effect of the eccentric distance on dynamic characteristics is analysed, the corresponding eccentric distances are 0.5, 1.0 and 2.0, respectively. In addition, the break-up during rebound is analysed with velocity field and pressure nephogram. Results show that, the eccentric distance hinders the spread during the initial period of spreading. With the increase in eccentric distance, more liquid gathers at the eccentric side and the liquid film might rebound easily without break-up under the same impact velocity. The break-up during rebound mainly depends on the local airflow and pressure difference. The high-pressure zone near the solid-liquid interface moves towards the eccentric side with the increase in eccentric distance.
Highlights
Droplet impact is a common but significant phenomenon in daily life and industry
For dual-droplet impacting a super-hydrophobic tube, the influence of eccentric distance on the dynamic characteristics is numerically studied with the CLSVOF method
The eccentric distance hinders the spread during the initial period of spreading
Summary
Droplet impact is a common but significant phenomenon in daily life and industry. The studies on it have been conducted by many scholars [1,2,3,4,5], the majority of which is about single-droplet impact. They numerically studied the dual-droplet impact, in which the numerical data using dynamic contact angle model is consistent with the experimental data well They found the maximum spread factor increases with the increment in impact velocity [7]. Liu et al [9] numerically studied the successive dual-droplet impact of heptane droplets They found the height of liquid crown increases with the increase in Reynold number, Weber number and vertical droplet spacing. Liang et al [13] simulated the multi-droplet impacting a hot liquid film, using a three-dimensional model It was found, with the increment in initial film thickness and Weber number, the diameter of primary crown decreases while the height of it increases. The CLSVOF method is adopted to simulate the process of successive dual-droplet impacting a super-hydrophobic tube, investigating the influence of eccentric distance
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
