Crossing trajectories and phase change in Eulerian–Eulerian models of disperse multiphase flows. (June 2015)

• Record Type: Journal Article
• Authors: Cubero, Ana; Sánchez-Insa, Alberto; Fueyo, Norberto
• Is Part Of: International journal of multiphase flow. Volume 72(2015)
• Page Start: 141
• Page End: 144
• Publication Date: 2015-06
• Subjects: Phase-change -- Crossing trajectory -- Eulerian–Eulerian algorithm -- Coal drying; Multiphase flow -- Periodicals; Écoulement polyphasique -- Périodiques; Multiphase flow; Periodicals; 620.1064
• DOI: 10.1016/j.ijmultiphaseflow.2015.02.011
• Languages: English
• ISSNs: 0301-9322

Abstract

Graphical abstract: Highlights: We analyze the modeling of phase-change phenomena in Eulerian–Eulerian frameworks. The standard model for the mass-transfer rate leads to unphysical solutions. Wet particles are heated beyond the evaporation temperature. We propose a numerical correction which removes this "numerical superheating". A 2D horizontal channel and a bubbling fluidized bed are used as test cases. Abstract: We analyze the representation in Eulerian–Eulerian models of disperse multiphase flows of phase change phenomena (such as particle drying or vapor condensation) occurring at the saturation temperature. The usually-employed model, whereby the heat transferred among the phases drives the phase change, leads to physically incorrect results ( viz. the presence of liquid at a temperature above the boiling point) as illustrated in this paper for the drying of solid particles. An efficient correction is proposed and verified in two canonical configurations (1D dilute flow and 2D horizontal channel with gravitational phase segregation). An application to a realistic bubbling fluidized bed is included as Supplementary Material.