Characteristics of Frictional Pressure Drop in Narrow Rectangular Channel in Rolling Motion

Single-phase flow and flow boiling resistances of water in narrow rectangular channel in rolling motion were investigated experimentally, the transient pressure drop characteristics were obtained and the mechanism of rolling motion effect on pressure drop oscillation was also analyzed. Rolling motion leads to the periodical fluctuation of frictional pressure drop. In the case of single-phase flow, the effect of rolling motion weakens with the increase of flow rate and temperature. While for flow boiling, position change of the system due to the rolling motion results in the fluctuation of pressure drop, of which the amplitude increases with the flow rate, vapor quality as well as rolling angle and period, and decreases with the increase of system pressure.