Role of cohesive energy in droplet fragmentation.
Role of cohesive energy in droplet fragmentation.
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内聚能在液滴破碎中的作用。
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
H. Urbassek
中科院分区：
文献类型：
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作者：
S. Sun;H. Urbassek
采用分子动力学模拟方法，研究了液滴与壁面碰撞后的破碎行为。我们证明了冲击力与液滴结合能E(CoH)的比值是表征液滴破碎过程的关键量。为了说明这一点，我们研究了范德华键合的Ar和N(2)液滴以及极性的H(2)O液滴。如果每个分子的撞击能量为E<；(0.35-0.4)E(CoH)，液滴就会被反射，而不会破碎。在撞击之后，液滴的能量碎裂突然开始。在E=E(Coh)时，破碎过程已经导致液滴精细分散成子液滴；最大碎片仅包含不到初始液滴质量的4%，约三分之一的液滴已破碎成孤立的分子。随着碰撞能量的增加，解体过程不断增加。这些发现与电喷雾微滴质谱仪冲击去溶法中所用的液滴破碎过程有关。
Using molecular-dynamics simulation, we investigate the fragmentation behavior of droplets after collision with a wall. We demonstrate that the ratio of the impact to the cohesive energy E(coh) of the droplet is the key quantity characterizing the droplet fragmentation process. To show this both van der Waals-bonded Ar and N(2) droplets and polar H(2)O droplets are studied. If the impact energy per molecule E<(0.35-0.4)E(coh), the droplet is reflected without fragmenting. Beyond that impact energy fragmentation of the droplet abruptly starts. At E=E(coh), the fragmentation process already results in a fine dispersal of the droplet into daughter droplets; the maximum fragment contains only less than 4% of the initial droplet mass and around one-third of the droplet has been shattered into isolated molecules. The disintegration process continuously increases with collision energy. These findings are relevant for the process of droplet fragmentation as used in the method of impact desolvation of electrosprayed microdroplets mass spectrometry.
影响因子：
2
作者：
Aksyonov, SA;Williams, P
通讯作者：
Williams, P