Kim, HY Feng, ZC Chun, JH 2024-01-21T14:15:16Z 2024-01-21T14:15:16Z 2021-09-01 2000-03 1070-6631 https://pubs.kist.re.kr/handle/201004/141562 A linear perturbation theory is developed to investigate the interface instabilities of a radially-expanding, liquid jet in cylindrical geometries. The theory is applied to rapidly spreading droplets upon collision with solid surfaces as the fundamental mechanism behind splashing. The analysis is based on the observation that the instability of the liquid sheet, i.e., the formation of the fingers at the spreading front, develops in the extremely early stages of droplet impact. The shape evolution of the interface in the very early stages of spreading is numerically simulated based on the axisymmetric solutions obtained by a theoretical model. The effects that factors such as the transient profile of an interface radius, the perturbation onset time, and the Weber number have on the analysis results are examined. This study shows that a large impact inertia, associated with a high Weber number, promotes interface instability, and prefers high wave number for maximum instability. The numbers of fingers at the spreading front of droplets predicted by the model agree well with those experimentally observed. (C) 2000 American Institute of Physics. [S1070-6631(00)00503-1]. English AMER INST PHYSICS RAYLEIGH-TAYLOR INSTABILITY FINGERING PATTERN BUBBLE DYNAMICS IMPACTING DROP SIMULATIONS Instability of a liquid jet emerging from a droplet upon collision with a solid surface Article 10.1063/1.870259 1 PHYSICS OF FLUIDS, v.12, no.3, pp.531 - 541 PHYSICS OF FLUIDS 12 3 531 541 scie scopus 000085241100008 2-s2.0-0034093019 Mechanics Physics, Fluids & Plasmas Mechanics Physics Article RAYLEIGH-TAYLOR INSTABILITY FINGERING PATTERN BUBBLE DYNAMICS IMPACTING DROP SIMULATIONS instability