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The purpose of this study is to analyze the liquid drop of variable collision velocity spreading on a solid surface by molecular dynamics theory. The surface and drop on the atomic scale are simulation by using thousands of molecules. The interatomic force is assumed to be derived from Lennard-Jones potential function. To calculate the position and velocity of molecules by the predictor-corrector method. The interactions among molecules will be analyzed by the arithmetic method of local interaction. The study use the numerical analysis. It can complement the lack in experiment, especial for the high collision velocity or much smaller drops simulation. To analyze the variable kinds of collision velocity, non-speed spreading of plate and drop are tried first. The value of velocity, then, in collision will be adjust increasing and analyze the spreading area. The molecules which are applied by Lennard-Jones potential make fantasy drop and plate. It*s only a simulation of collision between liquid drop and solid surface. For other applied case, we need to chose suitable potential form.
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