Transient Removal of a Foulant from a Cavity by Pulsating Duct Flow

L.C. Fang, D. Nicolaou* and J.W. Cleaver*
Department of Mechanical Engineering, Chinese Military Academy,
P.O. Box 90602-6, Fengshan, Kaohsiung 830, Taiwan, Republic of China
E-mail: lcfang@cc.cma.edu.tw
*Department of Engineering, The University of Liverpool,
Mechanical Engineering Building, Brownlow Street, L69 3GH, UK

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Presented in this paper is a preliminary numerical study of the hydrodynamic removal of contaminants contained in cavities which are situated on the floor of a two-dimensional duct. Applications include the cleaning of fouled rough surfaces which may occur in the food and chemical processing industries. The process of fluid renewal in a cavity is modelled via a numerical solution of the Navier-Stokes equations for transient flows. The results show that cavity cleaning occurs at a higher rate during the first several pulsating cycles and gradually diminishes with the increase of the pulsating cycles. It also shows that pulsating duct flow enhances cavity cleaning to compare with the cleaning that is achieved with uniform flow.



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