Impact of Two Drops on a Dry Surface = Impact of Two Drops on a Dry Surface

다국어 초록 (Multilingual Abstract)

A group of two streamwise drops could be successfully generated by using the free-falling drops technique incorporated with a drop severance device in this study. Therefore, the impact characteristics of a group of two streamwise drops impinging on a dry surface will be experimentally examined and analyzed in this study. The water was considered as the working fluid, and the velocity of the drop was fixed to 1.9 ± 0.1 m/s. The initial diameter of the drop was fixed to 930 ± 30 ㎛ and 1025 ± 5 ㎛, respectively. This study focused on four cases of two drops impinging on a dry surface which classified by space difference (ㅿt). Conditions respectively being Case 1: single drop impinging, Case 2: ㅿt = 0.5 ms, Case 3: ㅿt = 1 ms and Case 4: ㅿt = 2.5 ms. The results showed two drops impinging on a dry surface for Case 2~4, the maximum spread diameter of drop was 1.3 times compared with the single drop at the same initial drop diameter, but the variation process of two drops impinging on a dry surface was different to the single drop.