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首页> 外文期刊>Journal of Applied Polymer Science >Electrospray modeling of highly viscous and non-Newtonian liquids
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Electrospray modeling of highly viscous and non-Newtonian liquids

机译：高粘度和非牛顿液体的电喷雾建模

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The electrohydrodynamic spraying of highly viscous and non-Newtonian aqueous solutions of sodium alginate were experimentally modeled with high direct-current electric fields. A prototype electrospray setup comprising a nozzle connected to a high-voltage counter electrode connected to earth and a curing facility to solidify the droplets was used. The main aim was initially set to extend the knowledge of the electrospray to highly viscous liquids, where shear thinning was the main rheological feature of fluid flow through the nozzle of the spray system. To model the process, the effects on the size of beads of the electric field strength, nozzle diameter, flow rate, and the material properties of density, viscosity, surface tension, and electrical conductivity were characterized. The size distribution of the beads was obtained after the droplets were cured in a calcium chloride solution with an image analyzer system. The rheological study, carried out on different concentrations of alginate solution (i.e., 1-3 w/v %), showed a significant reduction in the viscosity as a function of the shear rate. Considering the shear-thinning behavior of the solutions, in the modeling we applied the viscosity at the operational shear rate in the nozzle. Four dimensionless groups were introduced to obtain the relationship between the dimensionless group representing diameter and the other groups in the dripping and jet modes with statistical analysis of the experimental data. The proposed equations correlated the size of beads within 610% deviations as compared to the experimental results.
机译：用高直流电场对海藻酸钠的高粘度和非牛顿水溶液进行电流体动力喷涂实验。使用了一个原型电喷雾装置，该装置包括一个喷嘴，该喷嘴连接到与大地相连的高压对电极，并具有固化液滴的固化设备。最初的主要目的是将电喷雾的知识扩展到高粘度液体，其中剪切稀化是流体流过喷雾系统喷嘴的主要流变学特征。为了模拟该过程，表征了电场强度，喷嘴直径，流速以及密度，粘度，表面张力和电导率的材料特性对珠粒尺寸的影响。用图像分析仪系统将液滴在氯化钙溶液中固化后，获得珠粒的尺寸分布。在不同浓度的藻酸盐溶液（即1-3w / v％）上进行的流变学研究表明，粘度随剪切速率而显着降低。考虑到溶液的剪切稀化行为，在建模中，我们在喷嘴中以工作剪切速率应用了粘度。通过对实验数据的统计分析，引入了四个无量纲组，以获取代表直径的无量纲组与滴灌和喷射模式下其他组之间的关系。与实验结果相比，所提出的方程式将微珠的大小与610％的偏差相关联。

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