研究目的
Investigating the fragmentation of a liquid drop that is hit by a laser pulse, focusing on the effects of early-time laser–matter interaction on late-time fragmentation.
研究成果
The fragmentation of liquid drops by laser-pulse impact is governed by two Rayleigh–Taylor instabilities, leading to rim and sheet breakup. The study provides scaling laws for the characteristic breakup time and wavenumber, highlighting the influence of early-time laser–matter interaction on late-time fragmentation. The deterministic aspects of fragmentation, influenced by the laser-beam profile and sheet kinematics, are also discussed.
研究不足
The study is limited by the optical resolution in characterizing small fragments, especially in the tin system. The analysis of fragment size distributions is challenging due to the complexity of the fragmentation process and the interference of mist clouds with rim fragments in the MEK system.
1：Experimental Design and Method Selection:
The study combines experimental data from two liquid systems (MEK and tin drops) with vastly different time and length scales to explore the fragmentation phenomena. The methodology includes high-speed visualizations and image analysis to study the deformation and fragmentation dynamics.
2：Sample Selection and Data Sources:
The experiments use dyed solvent (MEK) drops and liquid tin drops, characterized by their initial radius, density, surface tension, and other physical properties. Data acquisition involves stroboscopic image sequences and laser-beam profile characterization.
3：List of Experimental Equipment and Materials:
Includes laser systems for pulse impact, high-speed cameras for visualization, energy meters for laser-pulse energy measurement, and beam profilers for laser characterization.
4：Experimental Procedures and Operational Workflow:
Drops are impacted by laser pulses, and their response is observed from two orthogonal views. The process involves triggering the laser impact, acquiring the laser-pulse energy, and visualizing the drop's deformation and fragmentation.
5：Data Analysis Methods:
Image analysis yields the drop's center-of-mass position and velocity, sheet radius, and thickness. The analysis also includes the characterization of fragmentation patterns and the derivation of scaling laws for breakup time and wavenumber.
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