Skip navigation
Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/2860
Title: Mixing in curved tubes
Authors: Kumar, Vimal
Aggarwal M.
Nigam K.D.P.
Published in: Chemical Engineering Science
Abstract: The mixing efficiency in a curved tube is a complex function of the Reynolds number, Schmidt number, curvature ratio and tube pitch, therefore, the relative effectiveness of a helical tube is quite complicated and challenging over a straight tube. A state of art review on mixing of two miscible liquids in curved tubes revealed that the mixing in coils of circular cross section has not been reported in the literature. In the present work a computational fluid dynamics study is performed in curved tubes of circular cross-section of finite pitch under laminar flow conditions to examine the scalar mixing of two miscible fluids using scalar transport technique. In the present study the phenomenon of mixing by convection and diffusion of two flow streams with inlet scalar concentrations of zero and unity in the two halves of a tube perpendicular to the plane of curvature has been reported. The mixing efficiency has been quantified with concentration distributions and unmixedness coefficient at different cross-sections and process conditions (Reynolds number, Schmidt number and curvature ratio) in the straight and curved tube of circular cross-section. The result shows that, in curved tube, for higher Schmidt number fluids, mixing is considerably improved at moderately low Reynolds numbers (Re ? 10), but is not affected for Reynolds number of the order of 0.1. It is also reported that mixing in the curved tube is higher at low values of curvature ratio as compared to the higher curvature ratio. © 2006 Elsevier Ltd. All rights reserved.
Citation: Chemical Engineering Science (2006), 61(17): 5742-5753
URI: https://doi.org/10.1016/j.ces.2006.04.040
http://repository.iitr.ac.in/handle/123456789/2860
Issue Date: 2006
Keywords: Computational fluid dynamics
Helical tube
Scalar mixing
Straight tube
ISSN: 92509
Author Scopus IDs: 7404634425
57200775849
22980653700
Author Affiliations: Kumar, V., Department of Chemical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India
Aggarwal, M., Department of Chemical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India
Nigam, K.D.P., Department of Chemical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India
Corresponding Author: Kumar, V.; Department of Chemical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India
Appears in Collections:Journal Publications [CH]

Files in This Item:
There are no files associated with this item.
Show full item record


Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.