Yam is a vegetable that is widely grown around the world. Yam mucilage contains a high mucin concentration that can be useful for supporting the swallowing process. Although the shear and extensional rheology of yam mucilage is essential to its flow, they have not received much attention. Using a commercial rheometer and a filament stretching rheometer, the rheological properties of the mucilage in yam were examined. Yam mucilage exhibits shear-thinning behavior and viscoelastic behavior. In addition, yam mucilage also exhibits stretching phenomena and shows high extensional viscosity. However, the elasticity of yam mucilage decreased when the shear increased. The extensional rheological behavior of the yam mucilage can be predicted by two models, including the Giesekus model and global function. However, the agreement between the model and the experimental data decreases gradually when the Hencky strain increases, even though the model can predict the shear viscosity data well.

山药是一种在世界各地广泛种植的蔬菜。山药粘液含有高浓度的粘蛋白，可用于支持吞咽过程。尽管山药粘液的剪切和拉伸流变性对其流动至关重要，但它们并未受到太多关注。使用商用流变仪和长丝拉伸流变仪，检查了纱线中粘液的流变特性。山药粘液表现出剪切稀化行为和粘弹性行为。此外，山药粘液还表现出拉伸现象，表现出较高的拉伸粘度。然而，当剪切力增加时，山药粘液的弹性下降。山药粘液的拉伸流变行为可以通过两种模型来预测，包括Giesekus模型和全局函数。然而，