Dynamic Behavior of Non-Newtonian Droplets Impinging on Solid Surfaces
Dynamic Behavior of Non-Newtonian Droplets Impinging on Solid Surfaces
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DOI：
10.2320/matertrans.m2012215
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发表时间：
2013-01-01
影响因子：
1.2
通讯作者：
Lee, Seong Hyuk
中科院分区：
文献类型：
--
作者：
Moon, Joo Hyun;Lee, Jae Bong;Lee, Seong Hyuk
本文阐述了不同韦伯数下非牛顿液滴撞击固体表面的扩散和后退特性。黄原胶溶液用于产生非牛顿液滴。从使用高速相机捕获的数字图像，在冲击过程中测量铺展直径和动态接触角（DCA）。根据冲击速度，牛顿和非牛顿液滴之间的扩展和后退运动的显着差异，这是高度相关的粘性能量耗散。牛顿液滴和非牛顿液滴的最大铺展直径几乎相同，但由于剪切稀化效应，非牛顿液滴的后退运动要慢得多。此外，DCA的快速减少的扩展制度中观察到的非牛顿和牛顿液滴，表明惯性力成为主导。相比之下，测量的DCA的非牛顿流体液滴在后退制度大于那些牛顿流体液滴，表明凝聚力的表面力更占主导地位，在这个政权比惯性力。
This article illustrates the spreading and receding characteristics of non-Newtonian droplets impinging on solid surfaces at different Weber numbers. A xanthan gum solution was used to generate non-Newtonian droplets. From digital images captured using a high speed camera, spreading diameters and dynamic contact angles (DCA) were measured during the impact process. Depending on impact velocity, distinct differences in spreading and receding motions were found between Newtonian and non-Newtonian droplets, which were highly associated with viscous energy dissipation. The maximum spreading diameters for Newtonian and non-Newtonian droplets were nearly the same, but a much slower receding motion was observed for non-Newtonian droplets because of the shear-thinning effect. Moreover, a rapid decrease of DCA in the spreading regime was observed for both non-Newtonian and Newtonian droplets, indicating that the inertial force became dominant. By contrast, measured DCAs for non-Newtonian fluid droplets in the receding regime were larger than those for Newtonian fluid droplets, demonstrating that cohesive surface forces were more dominant than inertial forces in this regime.