Research on single-phase forced circulation in rectangular channel flow characteristics under rolling conditions

Studies on the single-phase flow characteristics in rolling rectangular channel were carried out using the de-ionized water as the working fluid under normal temperature and pressure. The single-phase water friction coefficient under rolling conditions is obtained, according to the pressure drop measured by experiments. Experimental results show that the volume flow of the closed loop cyclical fluctuations under rolling conditions. The amplitude of fluctuation increased with increasing rolling amplitude and frequency, and the average volume flow decreased due to the rolling motion. The average friction coefficient in rolling is larger than the one in the steady-state, which depends on the rolling amplitude, rolling cycle and the average Reynolds numbers. Empirical correlation for the average friction coefficient under rolling conditions is obtained by fitting a large number of experiment data. (authors)