Yilbas Bekir Sami, Abubakar Abba Abdulhamid, Hassan Ghassan, Al-Qahtani Hussain, Al-Sharafi Abdullah, Kassas Mahmood, Alzahran Abdullah A, Mohammed Anwaruddin Siddiqui
Mechanical Engineering Department, King Fahd University of Petroleum and Minerals (KFUPM), Dhahran 31261, Saudi Arabia.
IRC for Renewable Energy and Power, King Fahd University of Petroleum and Minerals (KFUPM), Dhahran 31261, Saudi Arabia.
Langmuir. 2022 Mar 29;38(12):3925-3935. doi: 10.1021/acs.langmuir.2c00255. Epub 2022 Mar 18.
The ferro-liquid droplet manipulation on hydrophobic surfaces remains vital for various applications in biomedicine, sensors and actuators, and oil-water separation. The magnetic influence of ferro-liquid droplets on the hydrophobic surface is elucidated. The mechanisms of a newborn droplet formation under the magnetic force are explored. The sliding and rolling dynamics of the ferro-liquid droplets are assessed for the various concentrations wt % of ferro-particles. High-speed recording and a tracker program are used to evaluate the droplet sliding and translational velocities. It is demonstrated that the mode of droplet motion changes from sliding to rolling as the magnetic Bond number increases, in which case, the droplet position becomes close to the magnet surface. The translational velocity of the droplet under rolling mode increases as the ferro-particle concentration in the droplet fluid increases. A further increase of the magnetic Bond number results in the creation of a newborn droplet attached to the magnet surface.
铁磁液滴在疏水表面上的操控对于生物医学、传感器与致动器以及油水分离等各种应用而言仍然至关重要。阐述了铁磁液滴在疏水表面上的磁影响。探究了在磁力作用下新生液滴形成的机制。针对不同重量百分比浓度的铁磁颗粒，评估了铁磁液滴的滑动和滚动动力学。使用高速记录和跟踪程序来评估液滴的滑动和平移速度。结果表明，随着磁邦德数增加，液滴运动模式从滑动变为滚动，在这种情况下，液滴位置变得靠近磁体表面。在滚动模式下，液滴的平移速度随着液滴流体中铁磁颗粒浓度的增加而增大。磁邦德数的进一步增加会导致在磁体表面附着形成一个新生液滴。
