A reactor-like spinneret used in 3D printing alginate hollow fiber: a numerical study of morphological evolution.
A reactor-like spinneret used in 3D printing alginate hollow fiber: a numerical study of morphological evolution.
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DOI：
10.1039/c5sm02733k
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发表时间：
2016-02
期刊：
影响因子：
3.4
通讯作者：
Li Yu;Liu Yi;Jiang Chen;Li Shuai;Liang Gang;Qingxi Hu
中科院分区：
文献类型：
--
作者：
Li Yu;Liu Yi;Jiang Chen;Li Shuai;Liang Gang;Qingxi Hu
在本文中，一个反应器状的聚合物被提出来产生一个连续的中空水凝胶纤维。为了可靠地控制变形动力学，标准化的组件，以方便在线观察形态演变。我们发现，不仅并流发生在管状空间，但也发生了一个相对较大的收缩壳层在出口处。在此基础上，建立了速度场与扩散反应同向流的弱耦合模型，用以描述监测到的同向流形态，模拟浓度场的中间状态，并用积分公式计算收缩剖面。并确定了一个临界等值线图[G]cri对应于形态学的节段特征，以触发凝胶化和收缩，作为溶解度的阈值和收缩区域的积分上限。实验结果表明：该模拟方法能够有效地预测中空纤维的内径;与初始流体力学值相比，出口处的纤维瞬时内径扩大了约70 μm（同向流距离= 15 mm），模拟内径的相对平均误差小于8%。拟议的研究提供了更深入的了解中空纤维的打印和其他凝胶化过程，利用反应器一样的凝胶。
In this paper, a reactor-like spinneret is proposed to generate a continuous hollow hydrogel fiber. In order to reliably control the deforming dynamics, the components of the spinneret are standardized in order to ease the online observation of morphological evolution. We found that not only did a co-flow occur in the tubular space, but a relatively large shrinkage of the shell layer at the outlet also occurred. Whereupon a weak coupling of the velocity field and diffusion-reacting co-flow was developed to describe the monitored co-flow morphology and to simulate the intermediate state of the concentration field, as well as to calculate the shrinkage profile with an integral formula. And a critical isogram [G]cri was determined to correspond to the morphological segmental feature, to trigger gelation and shrinkage as a threshold of solubility and the integral upper limit of the shrinkage region. Experimental evidence indicates that: the simulation is able to effectively predict the inner diameter of the hollow fiber; the transient inner diameter of the fiber at the outlet is expanded by approximately 70 μm (co-flow distance = 15 mm) as compared to the initial fluid dynamics value, and that the relative mean error of the simulated inner diameter was less than 8%. The proposed study provides deeper insight into the printing of hollow fibers and other gelling processes which utilize a reactor-like spinneret.