The authors have investigated pressure drop in heat exchanger elements, such as regenerator matrix and circular pipes including curved one, and presented several empirical formulas. Those experiments, however, were performed under relatively low Reynolds number due to sinusoidal low pressure change caused by speaker. In this study, a new pulsative pressure generator is developed and applied to evaluate flow characteristics of a circular pipe in the range of Re=250-18000. The experimental results show that similar tendency as compared with previous results is obtained.