2019 CSCE Annual Conference - Laval (Greater Montreal) Conference
Dr. Amir H. Azimi, Lakehead University
Laboratory experiments were conducted to study the behaviour of sand jets passing through two immiscible fluids (i.e., oil and water), formed by instantaneous release of dry sand particles from various heights above the oil layer. Different air release heights, nozzle diameters, and sand masses were tested. Effects of the characteristics of sand jets in air such as mass flow rate, sand impact velocity, and jet diameter on the evolution of oily sand jets were investigated. It was observed that the impact velocity has an insignificant effect on the variation of frontal velocity of sand jets. It was found that the diameter of sand jet in air linearly correlated with the nozzle diameter. Evolution of oily sand jets with time was investigated using image processing and boundary visualization techniques. Different shapes of frontal head and various evolution patterns were observed based on initial parameters. The frontal width and velocity of oily sand jets were measured for different evolution times. Dimensional analysis was performed and empirical correlations were introduced to predict the frontal width and velocity of oily sand jets passing through immiscible layer. The presented formulations can be used for engineering design and validation of numerical models.
Keywords: image processing, immiscible interface, particle cloud, sand jets, two-layer flow