Research on Single-Phase Forced Circulation in Rectangular Channel Flow haracteristics under Rolling Conditions
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摘要: 常温常压下,以去离子水为工质,对摇摆条件下矩形通道单相流动特性进行了研究。根据实验测得的压降,求出了摇摆条件下单相水的平均摩擦阻力系数。实验结果表明,摇摆工况下,闭合回路流量呈周期性波动。摇摆运动的频率和振幅越大,则回路的平均流量越小,流量波动幅度越大。摇摆状态下平均摩擦阻力系数比稳态值大,平均摩擦阻力系数值取决于摇摆周期、最大摇摆角度和平均雷诺数。通过对大量实验数据的拟合,得到了计算摇摆条件下平均摩擦阻力系数的经验关系式。Abstract: Studies on the single-phase flow characteristics in rolling rectangular channel were carried out using the deionized 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.
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Key words:
- Rolling motion /
- Forced circulation /
- Single-phase flow /
- Average frictional coefficient
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