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A zonal similarity analysis of friction factors in pipe flow of power lawfluids is presented. It uses the critical Reynolds number and friction factorat transition as estimates of the normalised velocity and distance between thewall and log-law layers and successfully collapses both Newtonian andnon-Newtonian data for laminar, transition and turbulent flows.  Key words: zonal similarity analysis, friction factor, Reynolds number,transition

A Zonal Similarity Analysis Of Friction Factors: Case Study 1: Pipe Flow Of Power Law Fluids