基于舌/上颚微间隙下流体流动行为研究

为探讨口腔环境下流体的流动行为，采用数值方法与流变试验深入研究舌/上颚微间隙下流体流量的影响因素. 建立舌/上颚微间隙的简化模型及Reynolds方程，通过数值方法获取微间隙下流量变化；在DHR-2流变仪上研究非牛顿流体的黏度与剪切率的变化，探讨牛顿流体和非牛顿流体的流量影响. 结果表明:牛顿流体流量平方的倒数同载荷和黏度比值和时间均呈线性函数关系；所制备的非牛顿流体近似为幂律流体，其黏度随脂肪含量的增加而增大，而非牛顿流体流量率先高于后低于等效牛顿流体，其研究结果将为特定人群功能产品的研发提供技术支持. 

Fluid Flow Behavior Based on Tongue/Upper Palate Micro-gap

In order to investigate the fluid flow behavior in the oral environment, numerical methods and rheological tests were used to investigate the influencing factors of fluid flow under the micro-gap between the tongue and the upper palate. A simplified model of the tongue and the upper palate under the micro-gap and the Reynolds equation were established. The flow value under the micro-gap was obtained by mean of numerical method. The viscosity and shear rate of the non-Newtonian fluid were investigated using the DHR-2 rheometer. The effect factors on the flow were discussed by Newtonian and non-Newtonian fluids. The results show that the reciprocal of the square of Newtonian fluid flow functioned as a linear relation with the ratio of load to viscosity and time. The prepared non-Newtonian fluid was approximately power-law fluid, and its viscosity increased with the increasing fat content. The varied rate of non-Newtonian fluid flow underwent a firstly higher then lower than that equivalent Newtonian fluid. The research results can provide technical support for the development of specific populations’ functional products.