Mechanical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia.
Interdisciplinary Research Center for Renewable Energy & Power Systems, KFUPM, Dhahran, 31261, Saudi Arabia.
Sci Rep. 2022 Apr 26;12(1):6759. doi: 10.1038/s41598-022-10697-9.
The sonic excitation of the liquid droplet on a hydrophobic mesh surface gives rise to a different oscillation behavior than that of the flat hydrophobic surface having the same contact angle. To assess the droplet oscillatory behavior over the hydrophobic mesh, the droplet motion is examined under the external sonic excitations for various mesh screen aperture ratios. An experiment is carried out and the droplet motion is recorded by a high-speed facility. The findings revealed that increasing sonic excitation frequencies enhance the droplet maximum displacement in vertical and horizontal planes; however, the vertical displacements remain larger than those of the horizontal displacements. The resonance frequency measured agrees well with the predictions and the excitation frequency at 105 Hz results in a droplet oscillation mode (n) of 4. The maximum displacement of the droplet surface remains larger for the flat hydrophobic surface than that of the mesh surface with the same contact angle. In addition, the damping factor is considerably influenced by the sonic excitation frequencies; hence, increasing sonic frequency enhances the damping factor, which becomes more apparent for the large mesh screen aperture ratios. The small-amplitude surface tension waves create ripples on the droplet surface.
液滴在疏油网表面上的声波激励会引起与具有相同接触角的平疏油表面不同的振动行为。为了评估疏水网上方液滴的振动行为，在各种网孔比的外部声波激励下检查液滴的运动。进行了实验，并通过高速设备记录了液滴的运动。结果表明，增加声波激励频率会增强液滴在垂直和水平方向上的最大位移；然而，垂直位移仍然大于水平位移。测量得到的共振频率与预测值吻合较好，激励频率为 105Hz 时会产生液滴的振动模式（n）为 4。对于具有相同接触角的平面疏油表面，液滴表面的最大位移仍然大于网面。此外，阻尼因子受到声波激励频率的显著影响；因此，增加声波频率会增加阻尼因子，对于较大的网孔比，这种影响更为明显。小振幅的表面张力波会在液滴表面产生涟漪。
