The viscosity of glass is the most important technological property to glass manufactures and various applications. Practically, finding an accurate equation to express the glass viscosity behavior in the entire glass transition temperature range is tremendously challenge because it spans more than ten orders of magnitude. After a brief review of existing empirical viscosity equations, this work focuses on the correlating silica viscosity behavior with the evolution of glass medium-range structure, based on the recently proposed nanoflake model. From this new model, a new equation is constructed, which correctly describes the Arrhenius-type behavior of silica viscosity η above the melting temperature Tm, and non-Arrhenius-type behavior from Tm to a critical temperature Tc. At temperature lower than Tc, the equation predicts Arrhenius-type behavior again for the viscous flow with increased activation energy. The new equation agrees with experimental data in the entire temperature spanned from extremely high to extremely low. The application of the new equation is shown to extend to sodium silicate glasses as well.

玻璃的粘度是玻璃制造和各种应用最重要的技术性能。实际上，找到一个精确的方程式来表达整个玻璃化转变温度范围内的玻璃粘度行为是一项巨大的挑战，因为它跨越了十多个数量级。在简要回顾了现有的经验粘度方程后，这项工作基于最近提出的纳米薄片模型，着重研究了二氧化硅粘度行为与玻璃中程结构的演变之间的关系。根据这个新模型，构造了一个新方程，该方程正确描述了二氧化硅粘度η的阿伦尼乌斯型行为 高于熔化温度Tm，以及从Tm到临界温度Tc的非阿累尼乌斯型行为。在低于Tc的温度下，该方程式将再次预测粘性流具有激活能量增加的Arrhenius型行为。新方程与从极高到极低的整个温度范围内的实验数据一致。新方程式的应用也显示出可以扩展到硅酸钠玻璃。