The residence time distribution (RTD) in a parallel-plate channel with staggered fins for both steady and pulsed flow conditions was experimentally determined. Dispersion and tank-in-series models were also adopted to characterize the system. The process fluid was water and the experiments were performed at room temperature. A steady Reynolds number Re ranging from 100 to 1000 was studied. The pulsating flow was generated using a frequency f of 6-20 Hz and an amplitude A of 0-2.3 mm. A pulse injection of sodium chloride solution was used as a tracer and the response in the form of electrical conductivity was measured at the outlet stream. The flow in the staggered finned channel approaches nearly plug-flow behavior with either higher steady-flow velocity or superposition of oscillation at low Re.