切变率的施加顺序和剪切史对全血粘度测定值影响的初步研究

Preliminary Studies on Effects for whole Blood Viscosity by Acting Shear Rate and Shearing History

用同样切变率和时间间隔，切变率由低至高和由高至低分别测定全血粘度时，前者在低切变率下具有较高全血粘度值，具有较陡的剪切稀化曲线和较高的卡松屈服应力值，后者反之；同一条件下连续两次测定，首次和第二次剪切相比，首次在低切变率下具有较高的全血粘度值，具有较陡的剪切稀化曲线和较高的卡松屈服应力值，第二次反之；本文注意到测定以前需要“具有同一流变学状态的起跑线”的问题。

Under the same shear rate values and time interval, to determine whole blood viscosity by different sequences of shear rates from low to high and from high to low respectively, the former shows higherx viscosity under low shear rate, steeper curve of viscosity versus shear rate and higher Casson yield stress; the latter shows vice versa. Under the same condition, to determine viscosity by tow times continuously, the first time shows higher viscosity under low shear rate, steeper curve of viscosity versus shear rate and higher Casson yield stress; the second time shows vice versa. In this paper we also pay attention to the problem 'how to keep the same rheologic start line before determining viscosity'.