Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 03, 2017 - September 06, 2017
The relationship between the particle orientation dispersed in the suspension and the shear viscosity has been studied. In order to clarify this relationship, it is necessary to execute the measurement of the shear viscosity and observation of the particle behavior simultaneously. A fiber suspension is used as a test sample. The dispersion media was a silicone oil and the rod like particles made of the glass and the carbon were dispersed into it with the volume concentration of 40 and 0.5 vol%, respectively. The rotary rheometer MCR301 is used as a platform and the parallel plate geometry made from the optical glass is used for a flow cell. The particle orientation in the suspension was observed by using a high-speed microscope during the flow. The orientation order parameter is introduced to examine the particle orientation quantitatively and it is evaluated from the images of the microscopic movie by the image analysis technique. It was clarified that the overshoot behavior observed in the shear viscosity coincided with the behavior of the orientation order in the step shear test.
