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SynopsisIn the present study the step response experiments were carried out with power law fluids in two helical coils to examine the suitability of axial dispersed plug flow model in describing the laminar dispersion of non-Newtonian fluids in helical coils. The ranges of variables covered are 10 I X 5 100,O.Ol -< N h s e , I 2.5,O.OOl I N D , I 0.77 and 0.035 I T I 1.33. It is found that coiling results in reduced dispersion to that in a straight tube.