论文标题
Elastocapillary Worthington喷气机
Elastocapillary Worthington jets
论文作者
论文摘要
撞击液滴对非润湿底物的缩回通常与沃辛顿射流的形成有关，沃辛顿射流是由缩回液体喂养的。已知液体的非牛顿流变学会影响撞击液滴的回缩。在这里，我们提出了一种与粘弹性液滴对不可焊接底物的影响有关的新现象。我们揭示了液体的粘弹性导致拉伸沃辛顿射流中的\ emph {elastocapillary}制度，以固定的接触线和不脱离液滴的细长射流而区别。我们确定了韦伯数字中的影响条件 - Deborah数字相位空间，用于观察这些\ emph {Elastocillary} Worthington Jets。这种喷气机的应变速率有效地表现出几乎线性的（时间）变化。进一步延伸后，射流表现出链条上的珠子，这是\ emph {lastocapillary}的特征，其细长的粘弹性液体丝的变薄。 \ emph {Elastocapillary} Worthington Jet不仅与液滴对固体底物方案的影响有关，而且还可以预期在其他配置中观察到Worthington Jet在粘弹性液体中观察到的沃辛顿射流，例如在An界面上液体池对液体池的下降和泡泡爆发。
The retraction of an impacting droplet on a non-wetting substrate is often associated with the formation of a Worthington jet, which is fed by the retracting liquid. A non-Newtonian rheology of the liquid is known to affect the retraction of the impacting droplet. Here we present a novel phenomenon related to the impact of viscoelastic droplets on non-wettable substrates. We reveal that the viscoelasticity of the liquid results in an \emph{elastocapillary} regime in the stretching Worthington jet, distinguished by a pinned contact line and a slender jet that does not detach from the droplet. We identify the impact conditions, in the Weber number -- Deborah number phase space, for observing these \emph{elastocapillary} Worthington jets. Such jets exhibit an effectively nearly linear (in time) variation of the strain rate. Upon further extension, the jet exhibits beads-on-a-string structures, characteristic of the \emph{elastocapillary} thinning of slender viscoelastic liquid filaments. The \emph{elastocapillary} Worthington jet is not only relevant for a droplet impact on a solid substrate scenario, but can also be expected in other configurations where a Worthington jet is observed for viscoelastic liquids, such as drop impact on a liquid pool and bubble bursting at an interface.
