摘要
本文给出了测量线性粘弹性流体粘性及弹性系数的一种新方法。近年来,Kaibara和Date等发展了一种与目前普遍采用的测定流体粘性系数的仪器具有不同工作原理的新型流变仪。用该仪器测量盛有待测流体的杯子作自由衰减振动时的振动周期及衰减指数,利用一定的理论模型,就可求得流体的粘性系数。Murata、Date及Kaibara对牛顿流体的模型进行了分析计算,给出了牛顿流体粘性系数与振动周期及衰减指数的函数关系式。为使该仪器能用来测量粘弹性流体的粘性、弹性系数,本文对一种粘弹性流体模型——线性粘弹性流体进行了理论分析计算,成功地得到了流体粘性、弹性系数与衰减振动周期及衰减指数的函数关系式。并给出一些数值计算结果。这样就能够通过测量样本——杯系统的衰减振动周期及衰减指数得到线性粘弹性流体的粘性、弹性等参数,从而提供了一种新的测量线性粘弹性流体的方法。而前面提到的牛顿粘性流体的情况则为本文结果中当流体弹性系数趋于无穷时的一个特例。
got the damping factor and oscilllation period as a function of the liqu-
id viscosity. In order that the instrument can be used to measure the
viscosity and elasticity of different viscoelastie fluids, one of the models
of viscoelastic fiuids---Iinear viscoelastic fluid was analy zed and calcul-
ated in this paper. The functional relationship was obtained between rhe-
ological parameters, such as viscosity or elasticity, and oscillation period
or damping factor measured by this rheometer. Also some numerical sol-
utions were given. thus, it becomes possible to get the viscosity and ela-
sticity by measuring the damping factor and period of oscillation of the
tube filled with fluid. The result for Newtonian fluid is a special solut-
ion of our results when the rigidity coefficient of the fluid approximates
infinity.
<ABSTRACT>
A new method of measuring viscosity and elasticity of Iinear viscoel-
astic fluids was given. In recent years, Kaibara and Date developed a
new type of rheometer based on different principles of other viscometers
used generaly. When the cylindrical tube filled with liquid oscillates,
the oscillation period and damping factor are measured. Using some the-
oretical model, we can obtain the viscosity of the fluid. Murata, Date
and Kaibara analyzed and calculated the model of Newtonian fluid and
出处
《中国生物医学工程学报》
CAS
CSCD
北大核心
1991年第4期255-264,227,共11页
Chinese Journal of Biomedical Engineering
