表面,流体中3D表面形貌,速度场,速度矢量场检测方案(粒子图像测速)

Many materials, such as paints, clay suspensions, concrete or inks, are complex fluids which present non-Newtonian properties. To define their rheological properties and particularly for coarse suspensions (debris mud, sediments…), we need to develop specific devices because of the size of the particles within the fluid to reach the continuum assumption. The study of the inclined plane flows can be a solution as soon as we are able to measure the evolution of the free surface and the surface velocity during the flow. We have developed specific 3D measurements based on stereovision to extract rheological properties of two materials flowing down an inclined flow. First a shear thinning fluid (a polyoxyde ethylene solution) is used to validate the method which is then applied to a viscoplastic material (a bentonite suspension). The comparison of the results with conventional measurements using a rheometer is in good agreement.