The resistance characteristic of single-phase pulsating flow was experimentally investigated. Using de-ionized water, experiments were conducted in the horizontal rectangular channel with 5.647mm inner diameter, considering three factors that were average flow, pulsation amplitude and pulsation period. Experiments focused on the turbulent region, and the atmospheric pressure and temperature conditions were maintained throughout the experiments. It was found that compared with steady flow in the same channel, the friction coefficient λ under the pulsating conditions was not only affected by the Reynolds number Re, but was also related to pulsation period and pulsation amplitude. And under the pulsating conditions, the Re-λ curve became pulsation circle, it resulted from the acceleration acting on the fluid and the phase difference between Re and λ.

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