Abstract: The extensional stresses and elongational viscosities of sesbania aqueous solution were measured by a self- made extensional rheometer. The extensional stresses and elongational viscosities gradually increased with strain rate, which explained the significant increase in flow resistance observed in a porous medium. The results also showed that the modified Williams- Bird constitutive equation with four parameters is suitable for either shear flow or elongational flow of sesbania aqueous solution.

摘要： 用自制的Sridhar-Gupta拉伸粘度计测定了田菁水溶液的拉伸应力与拉伸粘度.结果表明,田菁水溶液的剪切流动和拉伸流动都可用改进的Williams-Bird四参数本构方程描述.