Abstract
The front velocity in miscible exchange flow along the straight and curved tubes has been investigated. Almost the entire flow lies within the range of inertia dominated regime in the current experimental setup. Available data for straight pipes at different Atwood numbers have been revisited to provide an appropriate ground for better understanding and evaluation of the observations made for the flow in curved tubes. A 19.05 mm diameter and 2.40 m long tube has been formed to follow 55°of an arc in the vertical plane with the radius of curvature of 2.5 meters. The upper and lower parts are separated by a gate valve and filled with heavier and lighter fluids, respectively. The observations and analyses demonstrate how the continuous variations of the flow inclination along the curved path and the change in mixing dynamics associated with it can affect the velocity of downward and upward moving fronts. Most notably it has been detected that the velocity of upward moving front follows a similar trend as in straight pipes due to the continuously increasing mixing. However, the velocity of downward moving heavy front slightly decreases as opposed to the case of straight pipes, signifying the effect of curvature on mixing enhancement.
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