新型微珠流变仪

本文叙述了一种新型的流变仪,它能测定微珠在被测液体中的运动轨跡,从而对流体力学的研究提供了重要的实验手段,此外,它也能测定各种牛顿流体的粘度和非牛顿流体的粘弹性。

A NEW MICRORHEOMETER

A new mierorheiometer is presented in this paper. Viscosity and viscoelasticity of varlous fluids can be easily measured by mesas of this instrument. Put a fluidand a small nickel ball into a pond.There is a call above and the pond respectively. When a current goes through the coil. the magnetic field produced by the coil will exert a force on the nickel hall. The descending trace of the ball, therefore, has relation to the exerted force. With the aid of a measuring system the locus of the moving ball, the force, and the time can be converted into electric signals, which are stored in a computer. With the knowledge of fluid mechanics the theologic parameters of fluids (and polymeric liquids) can be calculated. As the descending trace of the ball can be measured, it is important to research the creep, the relaxation and the hysteresis of the flutds about balls of different shapes and different Reynol(?) numbers.