零温下超流氦-4的纳米射流与细丝：密度泛函理论研究
Nanoscopic jets and filaments of superfluid He-4 at zero temperature: a DFT study
AI总结：
本文利用氦密度泛函理论研究了零温下超流氦-4射流和细丝碎裂形成液滴的机制，发现长射流遵循无粘性流体线性理论，而超过阈值长径比的细丝收缩会因涡环成核而抑制液滴形成。
摘要：
低温氦射流从源腔喷出时的不稳定性会产生氦液滴，这些液滴被认为是用于嵌入原子和分子光谱学研究的理想基质。本文提出了对超流氦-4细丝射流断裂和收缩所导致液滴形成的氦密度泛函理论（He-DFT）描述。长射流的碎裂过程密切遵循无粘性流体的线性理论预测，形成液滴串并夹杂较小的卫星液滴；而长径比超过某一阈值的细丝收缩会导致涡环成核，从而阻碍其碎裂为液滴。
英文摘要：
Helium droplets produced by the instability of a cryogenic helium jet exiting a source chamber leads to the formation of He drops which are considered as ideal matrices for spectroscopic studies of embedded atoms and molecules. Here, we present a He-DFT description of droplet formation resulting from jet breaking and contraction of superfluid He-4 filaments. Whereas the fragmentation of long jets closely follows the predictions of linear theory for inviscid fluids, leading to droplet trains interspersed with smaller satellite droplets, the contraction of filaments with an aspect ratio larger than a threshold value leads to the nucleation of vortex rings which hinder their breakup into droplets.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
