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Title: Effect of channel cross-section on mixing length
Authors: Ahmad, Zulfequar
Published in: ISH Journal of Hydraulic Engineering
Abstract: Establishment of longitudinal dispersion requires estimation of mixing length. Mixing length is also required for the measurement of flow in streams by the dilution method where sample is taken at one point. Available methods for estimation of mixing length are limited to rectangular channel section for constant velocity, depth of flow and transverse mixing coefficient. However, in practice these parameters are not constant and rather vary in the transverse direction. This paper deals with effect of channel cross-section of varying velocity, depth of flow and transverse mixing coefficient across the width on mixing length. Mixing lengths for twelve typical cross- sections of streams have been computed using Ahmad's finite volume scheme. Computed mixing lengths for constant mixing coefficients are more than mixing length for variable mixing coefficients. For more non-uniform section of a channel, the mixing length is found to be more for constant mixing coefficient. Relationship for mixing length for varying transverse mixing coefficient for plane source of finite length located at bank and middle of stream has been proposed. The proposed relationship for mixing length produces satisfactory results. ¬© 2007 Taylor & Francis Group, LLC.
Citation: ISH Journal of Hydraulic Engineering(2007), 13(1): 1-17
Issue Date: 2007
Keywords: Flow measurement
Longitudinal dispersion
Mixing coefficient
Mixing length
River engineering
ISSN: 9715010
Author Scopus IDs: 7103092790
Author Affiliations: Ahmad, Z., Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
Corresponding Author: Ahmad, Z.; Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
Appears in Collections:Journal Publications [CE]

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