Convective mass transfer in helical pipes: effect of curvature and torsion |
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| Authors: | S Litster J G Pharoah N Djilali |
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| Institution: | (1) Department of Mechanical Engineering, University of Victoria, Victoria, BC, V8W 3P6, Canada;(2) Present address: Department of Mechanical Engineering, Queen’s University at Kingston, Kingston, ON, K7L 3N6, Canada |
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| Abstract: | A 3D numerical analysis of the flow and mass transfer in helical pipes is presented. The interpretation of the flow patterns
and their impact on mass transfer is shown to require a non-orthogonal pseudo-stream function based visualization. The strong
coupling between torsion and curvature effects, and the resulting secondary flow regimes are well characterized by a parameter
combining both the Dean (Dn) and Germano numbers (Gn). For membrane separation applications, helical modules combining high
curvature with low torsion would alleviate concentration polarization and yield appreciable flux improvement. |
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