ANALYSIS OF PARTICLE DEPOSITION FROM TURBULENT LIQUID-FLOW ONTO SMOOTH CHANNEL WALLS

Magali Dupuy (1) , Arunvady Xayasenh (1) , Emmanuel Waz (2) , Pierre Le Brun (2) , Hervé Duval (1)

1 LGPM - Laboratoire de Génie des Procédés et Matériaux - EA 4038
2 C-TEC - Constellium Technology Center

In this study, we analyse the motion of hydrosol particles in the near-wall shear layer of a turbulent channel flow. The liquid flow-field is described using the kinematic model proposed by Fan and Ahmadi (1995) combined with Lagrangian particle tracking. Numerical simulations were performed for friction velocity ranging from 1.5 mm. to 15 mm. , particle diameter from 5 to 50, particle to liquid density ratio from 1 to 1.4 and wall roughness height from to. The results show that the inertia effects are very weak. For nonbuoyant particles, direct interception is the main deposition mechanism and a law giving the deposition velocity as a function of the different parameters is proposed. For buoyant particles the deposition is controlled by sedimentation for the smallest values of friction velocity. When friction velocity increases, the direct interception contribution increases as well, and may prevail on sedimentation.

Mots clés: Fouling/clogging; metal refining; turbulent deposition; Lagrangian methods; liquid aluminum

Domaines: Sciences de l'ingénieur [physics]

Magali Dupuy, Arunvady Xayasenh, Emmanuel Waz, Pierre Le Brun, Hervé Duval. ANALYSIS OF PARTICLE DEPOSITION FROM TURBULENT LIQUID-FLOW ONTO SMOOTH CHANNEL WALLS. 10th International Conference on CFD in Oil & Gas, Metallurgical and Process Industries, Jun 2014, Trondheim, Norway. ⟨hal-01652607⟩