Detachment Characteristics of Deposited Particles in Porous Medium: Experimentation and Modeling

摘要

This paper presents an experimental study of particle transport in porous medium using a self-developed sand layer transportation-deposition testing system, aiming at delineating the detachment characteristics of deposited particles in porous medium. Two experimental modes, increase flow velocity and change flow direction, were adopted in this study. The tests were conducted using quartz powder as the particles and quartz sand as the porous media to study the response of detachment characteristics to changes in particle diameter (, with median diameter 18 and 41 m) and grain diameter (, with median diameter 0.36 and 1.25 mm). Breakthrough curves after the second peak were well described by a double exponential model with parameters of weight coefficient and detachment coefficient. This study shows that both modes can change the detach rate of deposited particles observably, and detach rate is affected by the value of flow velocity greatly.