Abstract The cone-jet is one of the most interesting means in electrohydrodynamic atomization (EHDA) for wide applications because of highly charged and monodisperse drops. The pulsating and stable cone-jet modes in EHDA of diethyleneglycol (DEG) are observed by means of high-speed photography technology, as well as the breakup modes transition of electrified jet from varicose to kink instability. The conductive liquid is driven to form a liquid cone at the outlet of the capillary tube, and form a permanent jet from the apex of the cone by the tangential electric stress. With an increase in electric potential, the cone angle and jet length increase. The electrified meniscus and cone may appear convex, linear sides and concave in cone jet mode/regime, which depends on the static equilibrium of forces exists at each point of electrified liquid surface. The jet breakup modes with multi-jet, varicose and kink instabilities are successively recorded as liquid flow rates increasing. The jet breakup transition depends on flow rate. The drops size rises proportionally with an increase in liquid flow rate or a decrease in electric potential in stable cone-jet mode. The dimensionless diameter d/d0 as a function of the dimensionless flow rate qV/qm is in good agreement with the universal scaling laws.

中文翻译：

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中等粘度低导电液体稳定锥形射流中电流体动力雾化（EHDA）的实验研究

摘要 锥形射流是电流体动力雾化（EHDA）中最有趣的方法之一，因为其具有高度带电和单分散的液滴，具有广泛的应用。通过高速摄影技术观察了二甘醇（DEG）EHDA中脉动和稳定的锥形射流模式，以及带电射流从曲张不稳定到扭结不稳定的破裂模式转变。导电液体在毛细管出口处被驱动形成液体锥体，并在切向电应力的作用下从锥体的顶点形成永久射流。随着电势的增加，锥角和射流长度增加。带电弯月面和锥体在锥体喷射模式/体制中可能出现凸面、线性侧面和凹面，这取决于在带电液体表面的每个点上存在的力的静态平衡。随着液体流速的增加，连续记录了具有多射流、曲张和扭结不稳定的射流破碎模式。射流分裂转变取决于流速。在稳定的锥形喷射模式下，液滴尺寸随着液体流速的增加或电势的降低而成比例地增加。作为无量纲流量 qV/qm 的函数的无量纲直径 d/d0 与通用标度定律非常一致。在稳定的锥形喷射模式下，液滴尺寸随着液体流速的增加或电势的降低而成比例地增加。作为无量纲流量 qV/qm 的函数的无量纲直径 d/d0 与通用标度定律非常一致。在稳定的锥形喷射模式下，液滴尺寸随着液体流速的增加或电势的降低而成比例地增加。作为无量纲流量 qV/qm 的函数的无量纲直径 d/d0 与通用标度定律非常一致。